WO2001084834A1 - Video recording system utilizing external video storage to record streaming video data via an isochronous interface - Google Patents

Video recording system utilizing external video storage to record streaming video data via an isochronous interface Download PDF

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Publication number
WO2001084834A1
WO2001084834A1 PCT/US2001/013492 US0113492W WO0184834A1 WO 2001084834 A1 WO2001084834 A1 WO 2001084834A1 US 0113492 W US0113492 W US 0113492W WO 0184834 A1 WO0184834 A1 WO 0184834A1
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WO
WIPO (PCT)
Prior art keywords
video
video data
external
rotating storage
data stream
Prior art date
Application number
PCT/US2001/013492
Other languages
French (fr)
Inventor
Ronald G. Parkinen
William G. Boyle
Original Assignee
Keen Personal Media, Inc.
Keen Personal Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Keen Personal Media, Inc., Keen Personal Technologies, Inc. filed Critical Keen Personal Media, Inc.
Priority to AU2001257314A priority Critical patent/AU2001257314A1/en
Publication of WO2001084834A1 publication Critical patent/WO2001084834A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4131—Peripherals receiving signals from specially adapted client devices home appliance, e.g. lighting, air conditioning system, metering devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4331—Caching operations, e.g. of an advertisement for later insertion during playback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4334—Recording operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
    • H04N21/43632—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wired protocol, e.g. IEEE 1394
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47214—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for content reservation or setting reminders; for requesting event notification, e.g. of sport results or stock market
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91342—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being an authentication signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/765—Interface circuits between an apparatus for recording and another apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/781—Television signal recording using magnetic recording on disks or drums
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction

Definitions

  • the present invention relates to information storage and display systems utilizing rotating storage drives, and more particularly, to video recording systems that record streaming video data
  • Video recording systems such as personal video recorders, typically utilize hard disk drive technology to store and replay video images.
  • hard disk drive technology has traditionally been used in computer-related applications.
  • storage capability e.g. 15 GB or more
  • non-volatile memory of an internal hard disk drive e.g. 15 GB or more
  • video compression and decompression capabilities e.g., video compression and decompression capabilities
  • personal video recorders allow users to pause and resume live television or to observe instant-replay while continuing to record the same incoming video data stream.
  • These capabilities are not provided by video cassette recorders that utilize magnetic tape storage, which is a sequential access medium (i.e., to jump from a particular stored video data stream to another, the tape must be advanced or rewound).
  • the storage space available for storing streaming video data in a personal video recorder is limited to the storage capacity of the internal hard disk drive within the personal video recorder itself. As such, once the storage capacity of the internal hard drive is completely filled with data, further video data storage requires rewriting over previously stored video data Users can then only store an incoming video data stream at the cost of removing a previously stored video data stream.
  • the present invention may be regarded as a video recording system to record an external video data stream for a video program segment selected using an electronic program guide.
  • the video recording system comprises a user interface that receives user input, a video input interface that receives the external video data stream for the selected video program segment, an isochronous interface connectable to an external rotating storage drive, and a video data management system.
  • the video data management system uses the electronic program guide to select the video program segment in response to the user input.
  • the video data management system recognizes connection of the external rotating storage drive to the video recording system and subsequently identifies the external rotating storage drive as available for video data storage.
  • the video data management system uses the external video data stream for the video program segment to provide streaming video data, and routes at least a portion of the streaming video data to the external rotating storage drive via the isochronous interface in order to record the external video data stream for the video program segment.
  • the present invention may also be regarded as a method of enabling the recording of an external video data stream for a video program segment selected using an electronic program guide.
  • the method receives user input by a video recording system that comprises an isochronous interface connectable to an external rotating storage drive.
  • the method receives the external video data stream for the selected video program segment by the video recording system, and uses the electronic program guide to select the video program segment in response to the user input.
  • the method recognizes connection of the external rotating storage drive and subsequently identifies the external rotating storage drive as available for video data storage, and uses the external video data stream for the video program segment to provide streaming video data.
  • the method routes at least a portion of the streaming video data to the external rotating storage drive via the isochronous interface in order to record the external video data stream for the video program segment.
  • Figure 1 schematically illustrates a video recording system in accordance with an embodiment of the present invention that includes a video data management system that uses an external video data stream for a video program segment to provide streaming video data, and that routes at least a portion of the streaming video data to an external rotating storage drive via an isochronous interface in order to record the external video data stream for the video program segment.
  • Figure 2 schematically illustrates an exemplary embodiment of the present invention wherein the video recording system further comp ⁇ ses a set-top box that receives the external video data stream from a multiple-service operator
  • FIG. 3 schematically illustrates another exemplary embodiment of the present invention wherein the video recording system further comp ⁇ ses a personal video recorder with an internal hard disk d ⁇ ve, and which is coupled to multiple external hard disk d ⁇ ves
  • Figure 4 is a flow diagram in accordance with an embodiment of the present invention that uses an external video data stream for a video program segment to provide streaming video data, and routes at least a portion of the streaming video data to an external rotating storage d ⁇ ve via an isochronous interface in order to record the external video data stream for the video program segment
  • FIG. 1 schematically illustrates a video recording system 10 in accordance with an embodiment of the present invention
  • the video recording system 10 comp ⁇ ses a user interface 20 that receives user input 22, a video input interface 30 that receives an external video data stream 32 for a selected video program segment 34, an isochronous interface 40 connectable to an external rotating storage d ⁇ ve 42, and a video data management system 50
  • the isochronous interface 40 is compatible with asynchronous communication, as well as with isochronous communication
  • the video data management system 50 uses an electronic program guide 52 to select the video program segment 34 in response to the user input 22, recognizes connection of the external rotating storage d ⁇ ve 42 to the video recording system 10 and subsequently identifies the external rotating storage d ⁇ ve 42 as available for video data storage
  • the video data management system 50 uses the external video data stream 32 for the video program segment 34 to provide streaming video data 54, and routes at least a portion of the streaming video data 54 to the external rotating storage d ⁇ ve 42
  • the video input interface 30 receives an external video data stream 32 from a multiple-service operator, also known as an MSO MSOs are video data service providers that supply video programming to multiple users Examples of MSOs include, but are not limited to, cable television systems and satellite systems Alternatively, the external video data stream 32 can be received from UHF or VHF broadcast signals using an antenna
  • the video input interface 30 is configured to ensure that the external video data stream 32 received by the video input interface 30 has a format which is compatible with by the video data management system 50
  • the video input interface 30 of one embodiment comp ⁇ ses an MPEG (Motion Pictures Experts Group) encoder, which generates a compressed digitally-formatted data stream in response to the analog-formatted external video data stream 32, and communicates the compressed digitally-formatted data stream to the video data management system 50
  • less storage capacity is required to record the compressed digitally-formatted data stream than the analog-formatted external video data stream 32
  • the video input interface 30 comp ⁇ ses a decrypter
  • the encoding and decrypting features desc ⁇ bed above may instead be performed by the video data management system 50, or by some other device upstream of
  • the isochronous interface 40 is coupled to the video data management system 50 in order to receive the streaming video data 54 corresponding to the external video data stream 32 for the video program segment 34 to be recorded
  • the isochronous interface 40 communicates various video data management commands from the video data management system 50 to the external rotating storage d ⁇ ve 42
  • the isochronous interface 40 is compatible with the IEEE 1394 standard, which is desc ⁇ bed in the "IEEE Std 1394-1995 IEEE Standard for a High Performance Se ⁇ al Bus," August 30,1996, which is incorporated by reference herein
  • the isochronous interface 40 includes capabilities to encrypt the streaming video data 54 before it is recorded onto an external rotating storage d ⁇ ve 42 to provide protection from unautho ⁇ zed copying or transportmg of stored video data by exchanging external rotating storage d ⁇ ves 42 between different video recording systems 10
  • the isochronous interface 40 is capable of applying DTLA ("Digital Transmission Licensing Administrator") copy protection utilizing authentication key exchange to the video data routed to the external rotating storage drive 42
  • DTLA copy protection is a well-known copy protection system, compatible with the IEEE 1394 standard, and is desc ⁇ bed in "Digital Transmission Content Protection Specification Revision 1 0," March 17,1999, which is incorporated by reference herein
  • DTLA copy protection is a well-known copy protection system, compatible with the IEEE 1394 standard, and is desc ⁇ bed in "Digital Transmission Content Protection Specification Revision 1 0," March 17,1999, which is incorporated by reference herein
  • up to 1023 bus segments may be connected together, with up to 63 external rotating storage drives 42 daisy-chained to each bus segment. Additionally, a full storage drive 42 can be disconnected and replaced with an empty storage drive 42.
  • video recording systems compatible with the IEEE 1394 standard provide nearly unlimited storage capacity.
  • the electronic program guide 52 is a database containing information regarding the broadcast schedules for various video program segments from various broadcast channels. This information is typically expressed in the form of a program grid with columns denoting the time periods, and with separate rows for each of the available broadcast channels.
  • the information of the electronic program guide 52 is communicated to the video data management system 50 via a separate input channel (e.g., via a phone line connection between the source of the electronic program guide 52 and the video recording system 10).
  • the information of the electronic program guide 52 is communicated to the video data management system 50 via the isochronous interface 40.
  • the information of the electronic program guide 52 is temporarily stored in memory by the video data management system 50 in particular embodiments.
  • the video data management system displays the program grid directly on the display device 62 being viewed by the user.
  • the user may then provide appropriate user input 22 to the video data management system 50 via the user interface 20.
  • the video data management system 50 then uses the electronic program guide 52 to select the external video data stream 32 for the video program segment 34 in response to the user input 22.
  • Persons skilled in the art are able to select an appropriate configuration of the electronic program guide 50 and the method of communicating its information to both the user and the video data management system 50 compatible with the present invention.
  • the video data management system 50 recognizes connection of an external rotating storage drive 42 to the video recording system 10 and subsequently identifies the external rotating storage d ⁇ ve 42 as available for video data storage
  • the isochronous interface 40 enables communication between the video data management system 50 and any external rotating storage d ⁇ ves 42 connected to the video recording system 10 Using information generated by the external rotating storage d ⁇ ves 42 and communicated via the isochronous interface 40, the video data management system 50 is able to recognize connection of and to identify as available the external rotating storage d ⁇ ves 42
  • the communication between the video data management system 50 and any external rotating storage d ⁇ ves 42 occurs upon connection of the external rotating storage d ⁇ ve 42 to the video recording system 10, thereby providing automatic recognition of the external rotating storage d ⁇ ve 42 in accordance with the IEEE 1394 standard
  • Persons skilled in the art are able to provide an approp ⁇ ate configuration and communication scheme between the video data management system 50 and the external rotating storage d ⁇ ves 42 compatible with the present invention
  • a set- top box is a known device typically used to receive user input 22 via a user interface 20, to receive an external video data stream 32 from an MSO via a video input interface 30, and to provide an output video data stream in response to the external video data stream 32.
  • the output video data stream of a known set-top box is typically configured to be compatible with other video devices which may be coupled to the set-top box, such as video cassette recorders and televisions.
  • Figure 2 also illustrates an external hard disk drive serving as an external rotating storage drive 42 coupled to a particular embodiment of the present invention.
  • the external hard disk drive provides storage capability which ⁇ s not found in known set-top boxes.
  • the video output interface 60 in Figure 2 is coupled to both a television as a display device 62 and a video cassette recorder 64.
  • the video output interface 60 of the illustrated embodiment is configured to provide compatibility with such video equipment already in existence.
  • FIG. 3 schematically illustrates a specific embodiment of the present invention wherein the video recording system 10 further comprises a personal video recorder 200 comprising a user interface 20, a video input interface 30, an isochronous interface 40, a video data management system 50, a video output interface 60, and an internal hard disk drive 70.
  • the video data management system 50 comprises an encoder 210 coupled to a respective SDRAM memory 212, a stream controller 220, a microprocessor 230, a decoder 240 coupled to a respective SDRAM memory 242, and an on-screen graphics driver (OSD) 250.
  • the microprocessor 230 controls the operation of the personal video recorder 200 by communicating with the other various components of the personal video recorder 200.
  • the user interface 20 of the embodiment illustrated in Figure 3 comp ⁇ ses an infrared receiver coupled to an infrared remote control keypad device and the video data management system 50 As desc ⁇ bed generally in the discussion of Figure 1, the user interface 20 receives user input 22, permitting the user to indicate to the personal video recorder 200 which video program segments 34 are selected for recording from the external video data stream 32, as well as to control va ⁇ ous other operation parameters of the personal video recorder 200
  • the video input interface 30 of the embodiment illustrated in Figure 3 is coupled to a set-top box and receives the external video data stream 32 for the selected video program segment 34 and is coupled to the video data management system 50 via the encoder 210
  • the encoder 210 compresses (i e , encodes) the video data stream from the video input interface 30 using the MPEG-2 compression technique, which is a known video data compression standard
  • the compressed video data stream is then communicated to the stream controller 220 as streaming video data 54 in the format of an MPEG single program transport stream
  • the encoder 210 is compatible with other compression techniques, including, but not limited to, wavelet compression, motion JPEG compression, and DV25 compression
  • the encoder 210 also utilizes a SDRAM memory 212
  • the electronic program guide 52 is received from the set-top box via the isochronous interface 40, and is communicated to the microprocessor 230 and the on-screen graphics d ⁇ ver 250
  • the microprocessor 230 uses the electronic program guide 52 to select the video program segment 34 m response to the user input 22
  • the isochronous interface 40 of the embodiment illustrated in Figure 3 is compatible with the IEEE 1394 standard and is coupled to the video data management system 50 via the stream controller 220
  • the isochronous interface 40 is connectable to multiple IEEE 1394-compatible external hard disk d ⁇ ves 42
  • the microprocessor 230 recognizes connection of the external hard disk d ⁇ ves 42 and subsequently identifies the external hard disk d ⁇ ves 42 as available for video datastorage
  • the video output interface 60 of the embodiment illustrated in Figure 3 is coupled to the video data management system 50 via the decoder 240 and the on-screen graphics driver 250.
  • the decoder 240 performs the inverse function of the encoder 240. By generating a video data stream that is compatible with display on the television 62, the decoder 240 enables the display of stored video data streams from the various storage drives coupled to the personal video recorder 200. In the embodiment illustrated in Figure 3, the decoder 240 also utilizes a SDRAM memory 242.
  • the on-screen graphics driver 250 generates a graphical representation of the electronic program guide 52 and other control parameters of the personal video recorder 200, which is displayed on a television 62 via the video output interface 60. Responding to the displayed graphical representation, the user may indicate to the personal video recorder 200 which video program segments 34 are selected for recording from the external video data stream 32, as well as to control various other operation parameters of the personal video recorder 200.
  • the internal hard disk drive 70 of the embodiment illustrated in Figure 3 is coupled to the video data management system 50 via the stream controller 220.
  • the internal hard disk drive 70 in Figure 3 comprises an IDE ("integrated drive electronics") interface, which is a known interface for mass storage devices in which the controller is integrated into the storage drive. Because IDE-compatible hard disk drives and IEEE 1394- compatible hard disk drives are not connectable to the same bus, the internal IDE hard disk drive 70 and the multiple IEEE 1394-compatible external hard disk drives 42 are coupled to the video data management system 50 via separate buses.
  • the stream controller 220 routes at least a portion of the streaming video data 54 to the external rotating storage drives 42 via the isochronous interface 40 in order to record the external video data stream 32 for the video program segment 34. Also, the stream controller 220 routes at least a portion of the streaming video data 54 to the internal hard disk drive 70.
  • FIG 4 is a flow diagram in accordance with an embodiment of the present invention that uses an external video data stream 32 for a video program segment 34 to provide streaming video data 54, and routes at least a portion of the streaming video data 54 to an external rotating storage drive 42 via an isochronous interface 40 in order to record the external video data stream 32 for the video program segment 34.
  • the flow diagram is described with reference to the video recording system 10 illustrated in Figure 1 Persons skilled m the art are able to recognize that, while the flow diagram illustrates a particular embodiment with steps in a particular order, other embodiments with different order of steps are also compatible with the present invention
  • a step 310 user input 22 is received by a video recording system 10 that comp ⁇ ses an isochronous interface 40 connectable to an external rotating storage d ⁇ ve 42
  • the video recording system 10 further comp ⁇ ses a user interface 20 which is coupled to a video data management system 50
  • the user input 22 is received by the user interface 20 and is communicated to the video data management system 50 for the steps desc ⁇ bed below
  • a video input interface 30 coupled to the video data management system 50 receives an external video data stream 32 for the selected video program segment 34
  • the external video data stream 32 is communicated to the video data management system 50 for the steps desc ⁇ bed below
  • an electronic program guide 52 is used by the video data management system 50 to select the video program segment 34 in response to the user input 22
  • the electronic program guide 52 is communicated to the user by displaying the information on a display device 62 via a video output interface 60
  • the user indicates the selected video program segment 34 by generating approp ⁇ ate user input 22
  • the video data management system 50 selects the video program segment 34 to be recorded
  • step 340 the video data management system 50 recognizes connection of the external rotating storage d ⁇ ve 42 via the isochronous interface 40 Preferably, step 340 occurs automatically upon coupling the external rotating storage d ⁇ ve 42 to the isochronous interface 40
  • step 350 the video data management system 50 identifies the external rotating storage dnve 42 as available for video data storage This step 350 is achieved by communication between the video data management system 50 and the external rotating storage dnve 42 which indicates the amount of available storage capacity of the external rotating storage d ⁇ ve 42
  • step 360 the video data management system 50 uses the external video data stream 32 for the video program segment 34 to provide streaming video data 54 As desc ⁇ bed above, this streaming video data 54 is compatible with the external rotating storage d ⁇ ve 42 and may be encoded or encrypted
  • the video data management system 50 routes at least a portion of the streaming video data 54 to the external rotating storage d ⁇ ve 42 via the isochronous mterface 40
  • the video data management system 50 selects the portion of the streaming video data 54 to be stored based on the user input 22, the electronic program guide 52, and information regarding the storage capacity of the various rotating storage d ⁇ ves

Abstract

A video recording system (10) and method of enabling the recording of an external video data stream (32) for a video program segment selected using an elecronic program guide (52). The video recording system (10) comprises a user interface (20) that receives user input (22), a video input interface (30) that receives the external video data stream (32) for the selected video program segment, an isochronous interface (40) connectable to an external rotating storage drive (42), and a video data management system (50). The video data management system (50) uses the electronic program guide (52) to select the video program segment in response to the user input (22), recognizes connection of the external rotating storage drive (42) to the video recording system (10), subsequently identifies the external rotating storage drive (42) as available for video data storage and routes at least a portion of the external video data stream (32) to the external rotating storage drive (42) via the isochronous interface (40).

Description

VIDEO RECORDING SYSTEM UTILIZING EXTERNAL VIDEO STORAGE TO RECORD STREAMING VIDEO DATA VIA AN ISOCHRONOUS INTERFACE
Background of the Invention Field of the Invention
The present invention relates to information storage and display systems utilizing rotating storage drives, and more particularly, to video recording systems that record streaming video data
Description of the Related Art
Video recording systems, such as personal video recorders, typically utilize hard disk drive technology to store and replay video images. Such hard disk drive technology has traditionally been used in computer-related applications. By coupling the large, yet finite, storage capability (e.g., 15 GB or more) and non-volatile memory of an internal hard disk drive, and video compression and decompression capabilities, personal video recorders allow users to pause and resume live television or to observe instant-replay while continuing to record the same incoming video data stream. These capabilities are not provided by video cassette recorders that utilize magnetic tape storage, which is a sequential access medium (i.e., to jump from a particular stored video data stream to another, the tape must be advanced or rewound).
The storage space available for storing streaming video data in a personal video recorder is limited to the storage capacity of the internal hard disk drive within the personal video recorder itself. As such, once the storage capacity of the internal hard drive is completely filled with data, further video data storage requires rewriting over previously stored video data Users can then only store an incoming video data stream at the cost of removing a previously stored video data stream.
There is, therefore, a need to provide the capabilities of video recording systems, while also providing the flexibility of adding storage capacity for video data streams.
Summary of the Invention The present invention may be regarded as a video recording system to record an external video data stream for a video program segment selected using an electronic program guide. The video recording system comprises a user interface that receives user input, a video input interface that receives the external video data stream for the selected video program segment, an isochronous interface connectable to an external rotating storage drive, and a video data management system. The video data management system uses the electronic program guide to select the video program segment in response to the user input. The video data management system recognizes connection of the external rotating storage drive to the video recording system and subsequently identifies the external rotating storage drive as available for video data storage. The video data management system uses the external video data stream for the video program segment to provide streaming video data, and routes at least a portion of the streaming video data to the external rotating storage drive via the isochronous interface in order to record the external video data stream for the video program segment.
The present invention may also be regarded as a method of enabling the recording of an external video data stream for a video program segment selected using an electronic program guide. The method receives user input by a video recording system that comprises an isochronous interface connectable to an external rotating storage drive. The method receives the external video data stream for the selected video program segment by the video recording system, and uses the electronic program guide to select the video program segment in response to the user input. The method recognizes connection of the external rotating storage drive and subsequently identifies the external rotating storage drive as available for video data storage, and uses the external video data stream for the video program segment to provide streaming video data. The method routes at least a portion of the streaming video data to the external rotating storage drive via the isochronous interface in order to record the external video data stream for the video program segment.
Brief Description of the Drawings
Figure 1 schematically illustrates a video recording system in accordance with an embodiment of the present invention that includes a video data management system that uses an external video data stream for a video program segment to provide streaming video data, and that routes at least a portion of the streaming video data to an external rotating storage drive via an isochronous interface in order to record the external video data stream for the video program segment. Figure 2 schematically illustrates an exemplary embodiment of the present invention wherein the video recording system further compπses a set-top box that receives the external video data stream from a multiple-service operator
Figure 3 schematically illustrates another exemplary embodiment of the present invention wherein the video recording system further compπses a personal video recorder with an internal hard disk dπve, and which is coupled to multiple external hard disk dπves
Figure 4 is a flow diagram in accordance with an embodiment of the present invention that uses an external video data stream for a video program segment to provide streaming video data, and routes at least a portion of the streaming video data to an external rotating storage dπve via an isochronous interface in order to record the external video data stream for the video program segment
Detailed Descπption of the Prefeπed Embodiment Figure 1 schematically illustrates a video recording system 10 in accordance with an embodiment of the present invention The video recording system 10 compπses a user interface 20 that receives user input 22, a video input interface 30 that receives an external video data stream 32 for a selected video program segment 34, an isochronous interface 40 connectable to an external rotating storage dπve 42, and a video data management system 50 Preferably, the isochronous interface 40 is compatible with asynchronous communication, as well as with isochronous communication The video data management system 50 uses an electronic program guide 52 to select the video program segment 34 in response to the user input 22, recognizes connection of the external rotating storage dπve 42 to the video recording system 10 and subsequently identifies the external rotating storage dπve 42 as available for video data storage The video data management system 50 uses the external video data stream 32 for the video program segment 34 to provide streaming video data 54, and routes at least a portion of the streaming video data 54 to the external rotating storage dπve 42 via the isochronous interface 40 in order to record the external video data stream 32 for the video program segment 34 Output from the video recording system 10 is routed via a video output interface 60 to a display device 62, typically a television, which is viewed by a user By receiving user input 22, the user interface 20 permits the user to indicate to the video recording system 10 which video program segments 34 are selected for recording from the external video data stream 32, as well as to control various other operation parameters of the video recording system 10, such as playback commands (eg , pause, instant-replay, etc ) In one embodiment of the present invention, the user interface 20 compπses a remote control keypad device (not shown) which emits infrared radiation encoded to signal the selections of the user, and an infrared receiver coupled to the video recording system 10 to receive the encoded signals of the user input 22 By pressing vaπous keys on the remote control keypad device, the user communicates which video program segments 34 are selected to the video recording system 10 Alternatively, or m addition, the user interface 20 can advantageously compπse a keypad wired directly to the video recording system 10, or can utilize another known communication technology to enable a user to provide the user input 22 to the video recording system 10 The user interface 20 is coupled to the video data management system 50 in order to communicate the user input 22 to the video data management system 50, which selects the video program segment 34 in response to the user input 22 Persons skilled in the art are able to select an appropπate remote control or keypad communication technology for the user interface 20 to receive the user input 22
In one embodiment of the present invention, the video input interface 30 receives an external video data stream 32 from a multiple-service operator, also known as an MSO MSOs are video data service providers that supply video programming to multiple users Examples of MSOs include, but are not limited to, cable television systems and satellite systems Alternatively, the external video data stream 32 can be received from UHF or VHF broadcast signals using an antenna
The video input interface 30 is configured to ensure that the external video data stream 32 received by the video input interface 30 has a format which is compatible with by the video data management system 50 For example, to provide compatibility of the video recording system 10 with an analog-formatted external video data stream 32, the video input interface 30 of one embodiment compπses an MPEG (Motion Pictures Experts Group) encoder, which generates a compressed digitally-formatted data stream in response to the analog-formatted external video data stream 32, and communicates the compressed digitally-formatted data stream to the video data management system 50 In addition, less storage capacity is required to record the compressed digitally-formatted data stream than the analog-formatted external video data stream 32 Furthermore, for particular embodiments that are compatible with an encrypted external video data stream 32 (e g , video data streams from premium cable channels), the video input interface 30 compπses a decrypter Alternatively, in other embodiments of the present invention, the encoding and decrypting features descπbed above may instead be performed by the video data management system 50, or by some other device upstream of the video recording system 10 Persons skilled in the art are able to provide a video input interface 30 that receives and appropπately responds to the external video data stream 32 in a manner in accordance with the present invention
In one embodiment of the present invention, the isochronous interface 40 is coupled to the video data management system 50 in order to receive the streaming video data 54 corresponding to the external video data stream 32 for the video program segment 34 to be recorded In addition, the isochronous interface 40 communicates various video data management commands from the video data management system 50 to the external rotating storage dπve 42 In certain embodiments of the present invention, the isochronous interface 40 is compatible with the IEEE 1394 standard, which is descπbed in the "IEEE Std 1394-1995 IEEE Standard for a High Performance Seπal Bus," August 30,1996, which is incorporated by reference herein
In particular embodiments of the present invention, the isochronous interface 40 includes capabilities to encrypt the streaming video data 54 before it is recorded onto an external rotating storage dπve 42 to provide protection from unauthoπzed copying or transportmg of stored video data by exchanging external rotating storage dπves 42 between different video recording systems 10 Alternatively, in other embodiments, the isochronous interface 40 is capable of applying DTLA ("Digital Transmission Licensing Administrator") copy protection utilizing authentication key exchange to the video data routed to the external rotating storage drive 42 DTLA copy protection is a well-known copy protection system, compatible with the IEEE 1394 standard, and is descπbed in "Digital Transmission Content Protection Specification Revision 1 0," March 17,1999, which is incorporated by reference herein By applying DTLA copy protection to the video data routed to the external rotating storage dπve 42, the routed video data is protected from unauthoπzed copying The preferred embodiment of the present invention is connectable via the isochronous interface 40 to an external rotating storage dπve 42 that is an external hard disk dπve compatible with the IEEE 1394 standard Alternatively, the external rotating storage drive 42 can be a writable digital video disk (DVD) drive, or another technology that provides writable non-volatile storage.
In embodiments which utilize an isochronous interface 40 and external rotating storage drives 42 that are compatible with the IEEE 1394 standard, up to 1023 bus segments may be connected together, with up to 63 external rotating storage drives 42 daisy-chained to each bus segment. Additionally, a full storage drive 42 can be disconnected and replaced with an empty storage drive 42. Thus, video recording systems compatible with the IEEE 1394 standard provide nearly unlimited storage capacity.
In the embodiment illustrated in Figure 1, the electronic program guide 52 is a database containing information regarding the broadcast schedules for various video program segments from various broadcast channels. This information is typically expressed in the form of a program grid with columns denoting the time periods, and with separate rows for each of the available broadcast channels. In one embodiment, the information of the electronic program guide 52 is communicated to the video data management system 50 via a separate input channel (e.g., via a phone line connection between the source of the electronic program guide 52 and the video recording system 10). Alternatively, in other embodiments of the present invention, the information of the electronic program guide 52 is communicated to the video data management system 50 via the isochronous interface 40. In addition, the information of the electronic program guide 52 is temporarily stored in memory by the video data management system 50 in particular embodiments. Typically, in order to enable a user to utilize the information of the electronic program guide 52, the video data management system displays the program grid directly on the display device 62 being viewed by the user. The user may then provide appropriate user input 22 to the video data management system 50 via the user interface 20. The video data management system 50 then uses the electronic program guide 52 to select the external video data stream 32 for the video program segment 34 in response to the user input 22. Persons skilled in the art are able to select an appropriate configuration of the electronic program guide 50 and the method of communicating its information to both the user and the video data management system 50 compatible with the present invention.
In the embodiment illustrated in Figure 1, the video data management system 50 recognizes connection of an external rotating storage drive 42 to the video recording system 10 and subsequently identifies the external rotating storage dπve 42 as available for video data storage The isochronous interface 40 enables communication between the video data management system 50 and any external rotating storage dπves 42 connected to the video recording system 10 Using information generated by the external rotating storage dπves 42 and communicated via the isochronous interface 40, the video data management system 50 is able to recognize connection of and to identify as available the external rotating storage dπves 42 In certain embodiments, the communication between the video data management system 50 and any external rotating storage dπves 42 occurs upon connection of the external rotating storage dπve 42 to the video recording system 10, thereby providing automatic recognition of the external rotating storage dπve 42 in accordance with the IEEE 1394 standard Persons skilled in the art are able to provide an appropπate configuration and communication scheme between the video data management system 50 and the external rotating storage dπves 42 compatible with the present invention In the embodiment illustrated in Figure 1, the video data management system 50 uses the external video data stream 32 for the video program segment 34 to provide streaming video data 54 Where the external video data stream 32 for the video program segment 34 is already in a format compatible with storage on an external rotating storage drive 42 via the isochronous interface 40, the video data management system provides streaming video data 54 which is unchanged from the external video data stream 32 Alternatively, where the external video data stream 32 is not in a compatible format, the video data management system 50 provides streaming video data 54 which compπses some conversion (e g , encoding or encryption) In alternative embodiments, this conversion may be performed by the isochronous interface 40 In the embodiment illustrated in Figure 1, the video data management system 50 routes at least a portion of the streaming video data 54 to the external rotating storage dπve 42 via the isochronous interface 40 in order to record the external video data stream 32 for the video program segment 34 In embodiments in which the video recordmg system 10 compπses an internal rotating storage dπve, such as a hard disk dπve, the video data management system 50 selectively routes portions of the streaming video data 54 among the internal rotating storage drive and the connected external rotating storage drives 42, dependmg on the storage availability of the vaπous drives Figure 2 schematically illustrates an exemplary embodiment of the present invention wherein the video recording system 10 further comprises a set-top box 100 that receives an external video data stream 32 from a multiple-service operator (MSO). A set- top box is a known device typically used to receive user input 22 via a user interface 20, to receive an external video data stream 32 from an MSO via a video input interface 30, and to provide an output video data stream in response to the external video data stream 32. The output video data stream of a known set-top box is typically configured to be compatible with other video devices which may be coupled to the set-top box, such as video cassette recorders and televisions. Providing a set-top box 100, as illustrated in Figure 2, with a video data management system 50, an isochronous interface 40, and a video output interface 60 in accordance with the present invention, provides an embodiment with the capabilities of known set-top boxes, while also providing the capabilities of the present invention.
Figure 2 also illustrates an external hard disk drive serving as an external rotating storage drive 42 coupled to a particular embodiment of the present invention. When coupled to a video recording system 10 in accordance with the present invention, the external hard disk drive provides storage capability which <s not found in known set-top boxes. In addition, the video output interface 60 in Figure 2 is coupled to both a television as a display device 62 and a video cassette recorder 64. The video output interface 60 of the illustrated embodiment is configured to provide compatibility with such video equipment already in existence.
Figure 3 schematically illustrates a specific embodiment of the present invention wherein the video recording system 10 further comprises a personal video recorder 200 comprising a user interface 20, a video input interface 30, an isochronous interface 40, a video data management system 50, a video output interface 60, and an internal hard disk drive 70. The video data management system 50 comprises an encoder 210 coupled to a respective SDRAM memory 212, a stream controller 220, a microprocessor 230, a decoder 240 coupled to a respective SDRAM memory 242, and an on-screen graphics driver (OSD) 250. In the embodiment illustrated in Figure 3, the microprocessor 230 controls the operation of the personal video recorder 200 by communicating with the other various components of the personal video recorder 200. The user interface 20 of the embodiment illustrated in Figure 3 compπses an infrared receiver coupled to an infrared remote control keypad device and the video data management system 50 As descπbed generally in the discussion of Figure 1, the user interface 20 receives user input 22, permitting the user to indicate to the personal video recorder 200 which video program segments 34 are selected for recording from the external video data stream 32, as well as to control vaπous other operation parameters of the personal video recorder 200
The video input interface 30 of the embodiment illustrated in Figure 3 is coupled to a set-top box and receives the external video data stream 32 for the selected video program segment 34 and is coupled to the video data management system 50 via the encoder 210 The encoder 210 compresses (i e , encodes) the video data stream from the video input interface 30 using the MPEG-2 compression technique, which is a known video data compression standard The compressed video data stream is then communicated to the stream controller 220 as streaming video data 54 in the format of an MPEG single program transport stream In an alternative embodiment of the present invention, the encoder 210 is compatible with other compression techniques, including, but not limited to, wavelet compression, motion JPEG compression, and DV25 compression In the embodiment illustrated in Figure 3, the encoder 210 also utilizes a SDRAM memory 212
In addition, in the embodiment illustrated in Figure 3, the electronic program guide 52 is received from the set-top box via the isochronous interface 40, and is communicated to the microprocessor 230 and the on-screen graphics dπver 250 The microprocessor 230 uses the electronic program guide 52 to select the video program segment 34 m response to the user input 22
The isochronous interface 40 of the embodiment illustrated in Figure 3 is compatible with the IEEE 1394 standard and is coupled to the video data management system 50 via the stream controller 220 In addition, as illustrated in Figure 3, the isochronous interface 40 is connectable to multiple IEEE 1394-compatible external hard disk dπves 42 The microprocessor 230 recognizes connection of the external hard disk dπves 42 and subsequently identifies the external hard disk dπves 42 as available for video datastorage
The video output interface 60 of the embodiment illustrated in Figure 3 is coupled to the video data management system 50 via the decoder 240 and the on-screen graphics driver 250. The decoder 240 performs the inverse function of the encoder 240. By generating a video data stream that is compatible with display on the television 62, the decoder 240 enables the display of stored video data streams from the various storage drives coupled to the personal video recorder 200. In the embodiment illustrated in Figure 3, the decoder 240 also utilizes a SDRAM memory 242.
The on-screen graphics driver 250 generates a graphical representation of the electronic program guide 52 and other control parameters of the personal video recorder 200, which is displayed on a television 62 via the video output interface 60. Responding to the displayed graphical representation, the user may indicate to the personal video recorder 200 which video program segments 34 are selected for recording from the external video data stream 32, as well as to control various other operation parameters of the personal video recorder 200.
The internal hard disk drive 70 of the embodiment illustrated in Figure 3 is coupled to the video data management system 50 via the stream controller 220. The internal hard disk drive 70 in Figure 3 comprises an IDE ("integrated drive electronics") interface, which is a known interface for mass storage devices in which the controller is integrated into the storage drive. Because IDE-compatible hard disk drives and IEEE 1394- compatible hard disk drives are not connectable to the same bus, the internal IDE hard disk drive 70 and the multiple IEEE 1394-compatible external hard disk drives 42 are coupled to the video data management system 50 via separate buses.
Pursuant to commands from the microprocessor 230 of the embodiment illustrated in Figure 3, the stream controller 220 routes at least a portion of the streaming video data 54 to the external rotating storage drives 42 via the isochronous interface 40 in order to record the external video data stream 32 for the video program segment 34. Also, the stream controller 220 routes at least a portion of the streaming video data 54 to the internal hard disk drive 70.
Figure 4 is a flow diagram in accordance with an embodiment of the present invention that uses an external video data stream 32 for a video program segment 34 to provide streaming video data 54, and routes at least a portion of the streaming video data 54 to an external rotating storage drive 42 via an isochronous interface 40 in order to record the external video data stream 32 for the video program segment 34. The flow diagram is described with reference to the video recording system 10 illustrated in Figure 1 Persons skilled m the art are able to recognize that, while the flow diagram illustrates a particular embodiment with steps in a particular order, other embodiments with different order of steps are also compatible with the present invention
In a step 310, user input 22 is received by a video recording system 10 that compπses an isochronous interface 40 connectable to an external rotating storage dπve 42 In the preferred embodiment of the present invention, the video recording system 10 further compπses a user interface 20 which is coupled to a video data management system 50 The user input 22 is received by the user interface 20 and is communicated to the video data management system 50 for the steps descπbed below Proceeding to a step 320, a video input interface 30 coupled to the video data management system 50 receives an external video data stream 32 for the selected video program segment 34 The external video data stream 32 is communicated to the video data management system 50 for the steps descπbed below
Proceeding to a step 330, an electronic program guide 52 is used by the video data management system 50 to select the video program segment 34 in response to the user input 22 The electronic program guide 52 is communicated to the user by displaying the information on a display device 62 via a video output interface 60 The user then indicates the selected video program segment 34 by generating appropπate user input 22 Using the received user input 22, the video data management system 50 selects the video program segment 34 to be recorded
Proceeding to a step 340, the video data management system 50 recognizes connection of the external rotating storage dπve 42 via the isochronous interface 40 Preferably, step 340 occurs automatically upon coupling the external rotating storage dπve 42 to the isochronous interface 40 Proceeding to a step 350, the video data management system 50 identifies the external rotating storage dnve 42 as available for video data storage This step 350 is achieved by communication between the video data management system 50 and the external rotating storage dnve 42 which indicates the amount of available storage capacity of the external rotating storage dπve 42 Proceeding to a step 360, the video data management system 50 uses the external video data stream 32 for the video program segment 34 to provide streaming video data 54 As descπbed above, this streaming video data 54 is compatible with the external rotating storage dπve 42 and may be encoded or encrypted
Proceeding to a step 370, the video data management system 50 routes at least a portion of the streaming video data 54 to the external rotating storage dπve 42 via the isochronous mterface 40 For embodiments coupled to an internal rotatmg storage dπve and/or to multiple dπves, the video data management system 50 selects the portion of the streaming video data 54 to be stored based on the user input 22, the electronic program guide 52, and information regarding the storage capacity of the various rotating storage dπves

Claims

WE CLAIM
1 A video recordmg system to record an external video data stream for a video program segment selected using an electronic program guide, the video recordmg system compπsing a user interface that receives user input, a video input mterface that receives the external video data stream for the selected video program segment, an isochronous mterface connectable to an external rotating storage dπve, and a video data management system that uses the electronic program guide to select the video program segment in response to the user mput, recognizes connection of the external rotating storage dπve to the video recordmg system and subsequently identifies the external rotating storage drive as available for video data storage, uses the external video data stream for the video program segment to provide streaming video data, and routes at least a portion of the streaming video data to the external rotatmg storage dπve via the isochronous mterface in order to record the external video data stream for the video program segment
2 The video recordmg system of Claim 1 further compπsing a set-top box that receives the external video data stream from a multiple-service operator
3 The video recording system of Claim 2, wheiein the set-top box compπses an internal rotating storage dπve
4 The video recordmg system of Claim 3, wherein the internal rotatmg storage dπve is an internal hard disk dπve compπsing an IDE interface
5 The video recordmg system of Claim 1 further compπsing a personal video recorder that receives the external video data stream
6. The video recording system of-Claim 5, wherein the personal video recorder comprises an internal rotating storage drive.
7. The video recording system of Claim 6, wherein the internal rotating storage drive is an internal hard disk drive comprising an IDE interface.
8. The video recording system of Claim 1, wherein the video data management system automatically recognizes connection of the external rotating storage drive to the video recording system.
9. The video recording system of Claim 1, wherein the external rotating storage drive is an external hard disk drive.
10. The video recording system of Claim 1, wherein the isochronous interface is compatible with the IEEE 1394 standard.
11. The video recording system of Claim 1, wherein the external video data stream and streaming video data include video data and audio data
12. The video recording system of Claim 1, wherein the video data management system further comprises a video data encoder that encodes at least a portion of the streaming video data
13. The video recording system of Claim 1, wherein the video data management system further comprises a video data encrypter that encrypts at least a portion of the streaming video data
14. The personal video recorder of Claim 1, wherein the video data management system comprises an internal rotating storage drive and routes at least a portion of the streaming video data to the internal rotating storage drive.
15 A method of enabling the recordmg of an external video data stream for a video program segment selected using an electronic program guide, the method compπsing receiving user input by a video recordmg system that compπses an isochronous mterface connectable to an external rotating storage dπve, receiving the external video data stream for the selected video program segment by the video recordmg system, usmg the electronic program guide to select the video program segment in response to the user mput, recognizing connection of the external rotating storage dπve and subsequently identifying the external rotating storage dπve as available for video data storage, usmg the external video data stream for the video program segment to provide streaming video data, and routing at least a portion of the streaming video data to the external rotatmg storage dπve via the isochronous mterface in order to record the external video data stream for the video program segment
16 The method of Claim 15, wherein the method further compπses encodmg at least a portion of the streaming video data
17 The method of Claim 15, wherein the method further compπses encrypting at least a portion of the streaming video data
18 The method of Claim 15, wherein the method further compπses routmg the portion of the streaming video data to either an internal rotatmg storage drive or the external rotating storage dπve
19. The method of Claim 18, wherein the method further comprises routing the portion of the streaming video data to the external rotating storage drive when the storage capacity of the internal rotating storage drive is insufficient to accommodate the anticipated size of the portion of the streaming video data to be recorded.
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