CN102264002A - Network adapter of digital household interactive service and realization method thereof - Google Patents
Network adapter of digital household interactive service and realization method thereof Download PDFInfo
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- CN102264002A CN102264002A CN2011102016284A CN201110201628A CN102264002A CN 102264002 A CN102264002 A CN 102264002A CN 2011102016284 A CN2011102016284 A CN 2011102016284A CN 201110201628 A CN201110201628 A CN 201110201628A CN 102264002 A CN102264002 A CN 102264002A
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Abstract
The invention belongs to the digital information transmission technology field and especially relates to a network adapter of a digital household interactive service and a realization method thereof. The network adapter comprises: a video streaming data receiving and control module (1), an IP data receiving and control module (2), a code stream analysis module (3), a new code stream generation module (4) and a data sending and control module (5). The video streaming data receiving and control module (1) receives a TS code stream, extracts effective data by using an FIFO, carries out code stream synchronization, makes clear that the positions of each byte in a packet and provides input for the code stream analysis module (3). The IP data receiving and control module (2) collects IP data of realizing the digital household interactive service and provides the IP data input for the new code stream generation module (4). The new code stream generation module (4) receives the IP data from the IP data receiving and control module (2), code stream analysis information of the code stream analysis module (3) and an SIP packet, combines the IP data and the SIP packet to create the new SIP packet. And then the new code stream is formed to be output after code stream recombination, code rate adaption, PCR calculation or updating are performed on the new SIP packet and the code stream analysis information of the code stream analysis module (3) successively.
Description
Technical field
The invention belongs to digital information transmission technical field, particularly a kind of digital home interactive business network adapter and implementation method.
Background technology
Ground digital television broadcast transmission system is supported multiple frequency network, MFN (MFN) and two kinds of networking models of single frequency network (SFN).The MFN pattern is meant that the adjacent transmission platform uses different channels to send the wireless-transmission network of same program; And the SFN pattern is meant by a plurality ofly being positioned at the different location, being in the Digital Television overlay network that the transmitter of synchronous regime is formed, each transmitter in the network is with identical frequency, in the identical identical programme signal of moment emission, to realize the reliable covering to particular service area.
At present, Digital Television is popularized gradually.Digital Television can be divided into pure reception type and two-way interaction type according to business.The realization of interactive TV business comprises IPQAM technology and IPTV technology in the two-wayization process.Wherein the IPQAM technology refers to a kind of technical system of interactive TV.The IPQAM of narrow sense refers to the IPQAM modulating equipment.IPQAM modulating equipment collection " multiplexing, scrambling, modulation, frequency translation " function is an one, and it in the multiplexing again multi-service transport stream in appointment of program stream of IP backbone input, carries out QAM modulation and frequency translation with DVB/IP again, output RF.After using IPQAM, the control information between STB and the CDN edge video server (CACHE) is transmitted by different paths respectively with video flowing: flow processs such as the access authentication of STB, EPG information browse are mutual by the two-way return path of IP; CDN edge video server exports audio/video flow to IPQAM equipment with appropriate package form after receiving user's request, IPQAM is transferred to STB by hfc plant after audio/video flow is modulated to the RF signal, and STB carries out the demodulation sign indicating number to realize interaction according to the corresponding audio/video flow of PID locking that head end returns.Being used for mutual IP network among Fig. 1 promptly can be independently physical network of EPON+LAN, also can be the IP over HFC of EPON+EOC multiplexed network (fiber section in can optical cable the different fiber space division multiplexing or with fine wavelength division multiplexing, then can frequency division multiplexing with shaft portion).Typical feature is that TV set-top box has RF and two input interfaces of IP in the IPQAM system, and no matter all audio/video flows are live (broadcasting) or program request all derives from the RF input interface.The IP duplex channel only is used for interactive passback or other IP value-added services.And IPTV technology IPQAM compares its maximum characteristics is exactly no matter to be that audio frequency and video or two-way interaction signal all use the IP channel.The video frequency program of IPTV mainly divides live and program request (comprising VoD and time shift program) in real time.Wherein live needs are used multicasting technology, watch the user of a channel can shared bandwidth simultaneously.The still unicast technique that program request is used, each is with needing independent bandwidth resources per family.For the IPTV technical system, hfc plant not necessarily.For only using the IPTV technical system to carry out the operator of interactive service coaxial cable not necessarily, even use the IP over Coax technology that also only is to use, its essence or IP network.Use the set-top box of IPTV technology to need not the RF input interface.
Chinese patent application 200410003492.6 (mono-frequency network system of ground digital television broadcast and its implementation) discloses a kind of mono-frequency network system, and it mainly is made up of ground digital television broadcast modulator three parts of single frequency adapter, GPS receiver, support single frequency network.At the center transmitting terminal, single frequency adapter inserts MIP bag in transmission code stream, carries relevant with GPS receiver lock in time of label and arrive the information such as system maximum delay of each relay station in the MIP bag.At each relay station, synchro system detects the MIP bag, therefrom readout time label and maximum delay, measure the received signal time-delay, calculate additional delay, and suitably postpone TS stream according to additional delay, make the signal Synchronization that each relay station is launched once more.This invention is present common single frequency network (SFN) architectural schemes.
Summary of the invention
The objective of the invention is to propose the new network adapter and the implementation method of a kind of digital home two-wayization interactive service, it can realize the audio/video flow of Digital Television, the organic assembling of Business Stream, generates and output to realize real interactive type TS stream.The present invention can be used in various ICP/IP protocol, Session Initiation Protocol network and the television network broadcasts followed, and realizes many network-adaptives of IP type or non-IP type network.
Below the present invention program is described further:
A kind of digital home interactive business network adapter is characterized in that it comprises:
Video stream data reception and control module, IP Data Receiving and control module, code stream analyzing module, new code stream generation module and data send and control module;
Wherein video stream data receives and control module receives the TS code stream, utilizes a FIFO extracted valid data, and it is synchronous to carry out code stream, and clear and definite each byte in bag the position and provide input for the stream parsing module;
IP Data Receiving and control module collection realize the IP data of digital home interactive business, and provide the input of IP data for new code stream generation module;
New code stream generation module will be from the IP data of IP Data Receiving and control module and the stream resolving information and the SIP bag of stream parsing module, and behind the SIP bag that IP data and SIP package is synthetic new successively through the code stream reorganization, code check is adaptive, PCR calculates or upgrade the back forms new code stream output.
Further, each module of the adapter of the above realizes by FPGA and the programming of FPGA programming software.
Based on the adapter of the above, the present invention also comprises the method that adapter is realized:
It is characterized in that having following steps:
Flow automatically the in the future SIP bag of parsing module and merge from the IP packet of IP Data Receiving and control module and to form new SIP bag of step 4, new code stream generation module;
Description of drawings
Fig. 1 is an adapter structure block diagram of the present invention;
Fig. 2 is the module frame chart that code stream analyzing of the present invention and new code stream form.
Embodiment
Embodiment one
As Fig. 1, digital home interactive business network adapter of the present invention comprises that video stream data receives and control module 1, IP Data Receiving and control module 2, code stream analyzing module 3, new code stream generation module 4 and data send and control module 5;
Wherein video stream data receives and control module 1 is used to receive the TS code stream, utilizes a FIFO extracted valid data, and it is synchronous to carry out code stream, and clear and definite each byte in bag the position and provide input for stream parsing module 3;
IP Data Receiving and control module 2 are used to gather the IP data that realize the digital home interactive business, and provide the input of IP data for new code stream generation module 4;
New code stream generation module 4 is used for will be from the IP data of IP Data Receiving and control module 2 and the stream resolving information and the SIP bag of stream parsing module 3, and behind the SIP bag that IP data and SIP package is synthetic new successively through the code stream reorganization, code check is adaptive, PCR calculates or upgrade the back forms new code stream output.
The integrated method that realizes of passing through special process chip or each functional circuit relative with commonly used at present, adapter of the present invention, each module is by FPGA and FPGA programming software programming realization.
SIP (Session Initiation Protocol) is the signaling control protocol of an application layer.Be used to create, revise and discharge one or more participants' session.These sessions can look like Internet multimedia conferencing, IP phone or multimedia distribution.The participant of session can communicate by multicast (multicast), netted clean culture (unicast) or both mixtures.SIP is the text based agreement that is similar to HTTP.Because the SIP based on the IP agreement has utilized IP network, use SIP, the service provider can choose at random standard package.SIP it neither Session Description Protocol, do not provide session control function but it can be cooperated with several other agreements yet, comprise the Lightweight Directory Access Protocol (LDAP) of being responsible for the location, the remote authentication dial-in customer service (RADIUS) of being responsible for authentication and a plurality of agreements such as RTP of responsible real-time Transmission.Because SIP itself is based on the IP agreement, institute think among the present invention in the TS code stream isolated SIP bag with recombinate from the data of IP network brought possible.To be described further its flow process that realizes that code stream analyzing, new code stream generate below:
As shown in Figure 2,
Receive the TS code stream via video stream data reception and control module 1 and input to stream parsing module 3; Stream parsing module 3 will be resolved from the TS stream of reception of video flow data and control module 1, and the deletion sky wraps and extract PCR information etc.
IP Data Receiving and control module 2 gathered the IP data that also input realizes the digital home interactive business, and provides the input of IP data for new code stream generation module 4; Flow automatically the in the future SIP bag of parsing module 3 and merge from the IP packet of IP Data Receiving and control module 2 and to form new SIP bag of new code stream generation module 4; The new SIP bag that new code stream generation module 4 will form carries out the code stream reorganization, code check is adaptive, PCR calculates or upgrades the back with the stream resolving information of stream parsing module 3 forming new code stream output.
Wherein, because TS stream can and judge with the data type that PID identifies this bag whether the PID of this bag is that sky determines whether this bag is empty bag by extraction.If next RAM module then do not sent into it by empty bag, directly abandon.Extract the PCR message part and also be divided into PID and two parts of information field of extracting PCR.At first to filter and resolve pat table, pmt table, extract the pid information of PCR bag.Then, from TS stream, filter the PCR packet.And PCR is as clock-timed comparison reference signal in the encoder, by the 27MHz clock signal sampling generation of encoder-side.It is the code word of 42bit, is made up of two parts: a part is a unit with 1/300 (90kHz) of system reference clock, is called the PCR foundation, long 33bit; Another part claims PCR expansion, is unit with system reference clock (27MHz) directly, long 9bit.PCR is extremely important in the MPEG-2 system, its information of carrying is equivalent to the clock information of encoder-side, decoder utilizes PCR information, and the system clock of the phase-locked loop circuit correction decoder by decoding end makes it reach the 27MHz clock that reaches unanimity with the encoder-side clock.Also need when its video and audio sample to be locked in this system clock, that is to say, look the audio decoder process and can normally carry out, depend on that at first can demodulation multiplexer accurately recover PCR.PCR information requires to be transmitted once every 40ms at least in the DVB standard, generally, PCR does not directly change the local clock of decoder, and for reference only benchmark is adjusted local clock, the local clock and the PCR of decoder are reached unanimity, thereby reach unanimity with the clock of coding side.
PCR information is the foundation of program clock reference, but after this TS stream is sent into single frequency adapter, to delete empty bag to it, insert the SIP bag, code stream is adaptive, it is invalid that these a series of operations make that original PCR data become, so, single frequency adapter inside also needs the counter of a 27MHz, will insert in the TS stream of output after the PCR information extraction in the former TS stream, the re-computation again.
Embodiment two
A kind of implementation method of digital home interactive business network adapter for realizing the adaptive method of business network by the described adapter of claim 1, is characterized in that having following steps:
Flow automatically the in the future SIP bag of parsing module 3 and merge from the IP packet of IP Data Receiving and control module 2 and to form new SIP bag of step 4, new code stream generation module 4;
In sum, what the present invention protected is a kind of digital home interactive business network adapter and implementation method, and those skilled in the art can do concrete details according to known knowledge and further expand, to guarantee the full implementation of adapter and method.
Claims (4)
1. digital home interactive business network adapter is characterized in that it comprises:
Video stream data receives and control module (1), IP Data Receiving and control module (2), code stream analyzing module (3), new code stream generation module (4) and data send and control module (5);
Wherein video stream data receives and control module (1) receives the TS code stream, utilizes a FIFO extracted valid data, and it is synchronous to carry out code stream, and the position of clear and definite each byte in bag and provide input for stream parsing module (3);
IP Data Receiving and control module (2) collections are realized the IP data of digital home interactive business, and are that new code stream generation module (4) provides the input of IP data;
New code stream generation module (4) will be from the IP data of IP Data Receiving and control module (2) and the stream resolving information and the SIP bag of stream parsing module (3), and behind the SIP bag that IP data and SIP package is synthetic new successively through the code stream reorganization, code check is adaptive, PCR calculates or upgrade the back forms new code stream output.
2. adapter as claimed in claim 1 is characterized in that, its each module realizes by FPGA and the programming of FPGA programming software.
3. the implementation method of a digital home interactive business network adapter realizes the adaptive method of business network for passing through the described adapter of claim 1, it is characterized in that having following steps:
Step 1, video stream data receive and control module (1) receives the TS code stream, utilize a FIFO extracted valid data, and it is synchronous to carry out code stream, and the position of clear and definite each byte in bag;
Step 2, stream parsing module (3) will be resolved from the TS stream of reception of video flow data and control module (1), and the deletion sky wraps and extracts PCR information;
Step 3, IP Data Receiving and control module (2) are gathered and input realizes the IP data of digital home interactive business, and are that new code stream generation module (4) provides the input of IP data;
Flow automatically the in the future SIP bag of parsing module (3) and merge from the IP packet of IP Data Receiving and control module (2) and to form new SIP bag of step 4, new code stream generation module (4);
Step 5, new code stream generation module (4) carries out step 4 new SIP bag that forms and the stream resolving information that flows parsing module (3) the code stream reorganization, code check is adaptive, PCR calculates or upgrades the new code stream output of back formation.
4. the implementation method of digital home interactive business network adapter as claimed in claim 3 is characterized in that, its each functions of modules realizes by FPGA and the programming of FPGA programming software.
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| CN 201110201628 CN102264002B (en) | 2011-07-14 | 2011-07-14 | Network adapter of digital household interactive service and realization method thereof |
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| CN 201110201628 CN102264002B (en) | 2011-07-14 | 2011-07-14 | Network adapter of digital household interactive service and realization method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102387058A (en) * | 2011-12-19 | 2012-03-21 | 江苏奇异点网络有限公司 | Home network adapter |
| CN102625154A (en) * | 2012-02-23 | 2012-08-01 | 深圳市龙视传媒有限公司 | Transport stream multiplexing method, program receiver, server and system |
| CN104283834A (en) * | 2013-07-03 | 2015-01-14 | 景略半导体(上海)有限公司 | IPQAM master equipment, IPQAM slave equipment and digital sending and receiving system of integrated service in HFC |
| CN112601133A (en) * | 2020-12-11 | 2021-04-02 | 杭州当虹科技股份有限公司 | IP code stream analysis method based on network card hardware timestamp |
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| CN1678068A (en) * | 2004-04-01 | 2005-10-05 | 清华大学 | Single-frequency network system of ground digital TV broadcast and its realizing method |
| US20060130113A1 (en) * | 2004-12-15 | 2006-06-15 | Carlucci John B | Method and apparatus for wideband distribution of content |
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| WO2005064977A1 (en) * | 2003-12-29 | 2005-07-14 | Nokia Corporation | Method and system for controlling access bearer in a real-time data service |
| CN1678068A (en) * | 2004-04-01 | 2005-10-05 | 清华大学 | Single-frequency network system of ground digital TV broadcast and its realizing method |
| US20060130113A1 (en) * | 2004-12-15 | 2006-06-15 | Carlucci John B | Method and apparatus for wideband distribution of content |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102387058A (en) * | 2011-12-19 | 2012-03-21 | 江苏奇异点网络有限公司 | Home network adapter |
| CN102625154A (en) * | 2012-02-23 | 2012-08-01 | 深圳市龙视传媒有限公司 | Transport stream multiplexing method, program receiver, server and system |
| CN104283834A (en) * | 2013-07-03 | 2015-01-14 | 景略半导体(上海)有限公司 | IPQAM master equipment, IPQAM slave equipment and digital sending and receiving system of integrated service in HFC |
| CN112601133A (en) * | 2020-12-11 | 2021-04-02 | 杭州当虹科技股份有限公司 | IP code stream analysis method based on network card hardware timestamp |
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| CN102264002B (en) | 2013-06-05 |
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