CA2295148C - Multimedia multiplexing method - Google Patents
Multimedia multiplexing method Download PDFInfo
- Publication number
- CA2295148C CA2295148C CA002295148A CA2295148A CA2295148C CA 2295148 C CA2295148 C CA 2295148C CA 002295148 A CA002295148 A CA 002295148A CA 2295148 A CA2295148 A CA 2295148A CA 2295148 C CA2295148 C CA 2295148C
- Authority
- CA
- Canada
- Prior art keywords
- frame
- flag
- multiplexing method
- multiplexing
- pdu
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/70—Media network packetisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
- H04J3/0611—PN codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
- H04L65/1106—Call signalling protocols; H.323 and related
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/89—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder
-
- 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]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
-
- 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
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/24—Systems for the transmission of television signals using pulse code modulation
- H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
Abstract
A multiplexing method for multimedia communication is provided, which is compatible with the H.223 protocol by changing a header of a multiplex protocol data unit (MUX-PDU). The multiplexing method includes the steps of encoding media data, and multiplexing the media data encoded in the step (a) in units of a predetermined frame, and inserting a second flag (150) having a predetermined length with an auto-correlation in the frame after a first flag (140) having the opening and closing of the frame. Therefore, the probability of detecting the MUX-PDU by a receiver is increased by adding a flag (150) having a high auto-correlation to the H.223 MUX-PDU frame, thereby increasing error-resiliency.
Description
MULTIMEDIA MULTIPLEXING METHOD
Technical Field The present invention relates to a multiplexing method for multimedia communication, and more particularly, to a multiplexing method compatible with the H.223 protocol by changing a header of a multiplex-protocol data unit (MUX-PDU}.
Background Art In general, the H.324 recommendation prescribes a multiplexing of video and audio signals which is effective in an error-prone channel such as a wireless channel, and includes H.223 multiplexing, H.245 controlling, H.263 video CODEC
and 6.723.1 audio CODEC. Also, H.223 multiplexing is recommended as a method for multiplexing video, audio and other data in protocol data units (PDU) in order to realize a video telephone and video conferencing in a total digital telecommunication network by the ITU-T (the telecommunication standardization sector of the International Telecommunication Union). Also, the H.324 recommendation includes Mode 1 having high complexity and Mode 3 without having complexity. According to the Mode l, while generating a variable length packet an unequal error protection (UEP) is performed by adopting a rate compatible punctured convolutional (RCPC) encoder/decoder (CODEC) in an adaptation layer which is an upper layer. Also, an automatic request for retransmission (ARQ) is used to maintain the overall quality of service (QOS) even though the channel throughput decreases. However, the Mode 1 has a high complexity at a portion of RCPC CODEC, which increases the complexity of the overall system. Thus, it is difficult to implement a real-time process. Also, the total channel throughput of the system may decrease rapidly since it adopts a retransmission method. For example, the channel throughput is 50%a or less when the retransmission is performed one time, and 33 % or less when the retransmission is performed twice. Thus, it is difficult in Mode 1 of the H.324 to implement transcoding having compatibility with the conventional H.223. Meanwhile, Mode 3 has virtually no error-protection concept, so that error-resiliency in an error-t at prone channel is very low.
Disclosure of the Invention It is an object of the present invention to provide a multiplexing method for multimedia communication, enabling transcoding with the H:223 protocol by adding a flag which is similar to a pseudo noise code (PN CODE) after a high-level data link control (HDLC) flag in the multiplex-protocol data unit (MUX-PDU) by the H.223 protocol.
To achieve the object, there is provided a multiplexing method for multimedia communication in the H.223 protocol, comprising the steps of: (a) encoding media data;;.and .(b) multiplexing the media data encoded in the step (a) in units of a predetermined frame; and inserting a second flag having a predetermined length with an auto-correlation in the frame after a first flag having the opening and closing of the frame.
Preferably, the second flag of-the step (b) has a bit pattern of "10110010".
Brief Description of the Drawings FIG. 1 is a schematie block diagram of a device for implementing a multiplexing method for multimedia communication; compatible with the H.223 protocol, according to the present invention; , FIG. 2A is a diagram showing the structure of a general H.223 MLJX-PDU
frame; and FIG. 2B is a diagram showing tie structure of an H.~2~ X-PDU~ frame according to the present invention;
FIG. 3A is a diagram showing the structure of the H.~2~ ~=I'D~ free in a filling mode; and FIG. 3B is a diagram showing the swcture of the H.223' MUX PDU frame in an abort message mode.
Best mode for carrying out the Invention In FIG. 1 showing a device for implementing an H.223 multiplexing method for multimedia communication according to the present invention, a multiplexing ~. i s < .
portion 130 includes an H.223 protocol unit 110 and a transcoder 120. The H.223 protocol unit 110 and the transcoder 120 performs multiplexing with respect to encoded media data (video, audio and other data), passing through protocol data units (not shown) to transmit to a channel.
FIG. 2 is a diagram showing the structure of a general H.223 MUX-PDU
frame .
As shown in FIG. 2A, the H.223 MUX-PDU is constituted by units of~ a frame, and the frame includes a high-level data link control (HDLC) flag 110 for transmission control, a header 120 including data information, and a payload including video and audio data.
All MUX--PDU of the H.223 are defined using the HDLG flag 110 of FIG.
2A. The HDLC flag 110 has an unique bit pattern "01111110" having . six continuous " 1 s" representing the opening or closing of the frame, and is used for synchronization of the frame.
FIG. 2B is a diagram showing the structure of an H.223 MUX-PDU_ frame according to the present invention. The MUX-PDU frame includes an HDLG flag 140, an extra flag 150, a header 160 and a payload 170. The transcoder 120 inserts an 8-bit extra flag 150 which is similar to a pseudo noise code (PN
CODE) having a high auto-correlation next to the HDLC flag 150 as shown in FIG. 2B.
Here, the reason for selecting the extra flag having a bit pattern of "10110010" is due to its high auto-correlation as the PN CODE does. Thus, only the bit pattern of "10110010" may be added as the extra flag 150, or other bit streams having a high auto-correlation may be used thereas to increase error-resiliency. Also, a longer flag may be added in consideration of a trade-off with a channel band width.
Preferably, adding the extra flag, suggested by the present invention is used, is prevented in a filling mode in which HDLC flags exist continuously as shown in FIG. 3A or an abort message mode without having a payload as shown in FIG. 3B.
1'he multiplexing method for multimedia communication according to the present invention is not limited to the particular form illustrated and further modifications and alterations will occur to those skilled in the art. That is, interleaving and RCPC processes may be performed by using each extra flag of a plurality of MUX-PDUs. -Industrial A~nlicability As described above, in the multiplexing method for multimedia communication according to the present invention, MUX-PDU including an extra flag having a high auto-correlation is transmitted in the H.223 protocol, increasing the probability of detecting the MUX-PDU by a receiver. Thus, error-resiliency is also increased. Also, when the multiplexing method is used together with the RCPC and interleaving methods, error-resiliency can be further increased.
Technical Field The present invention relates to a multiplexing method for multimedia communication, and more particularly, to a multiplexing method compatible with the H.223 protocol by changing a header of a multiplex-protocol data unit (MUX-PDU}.
Background Art In general, the H.324 recommendation prescribes a multiplexing of video and audio signals which is effective in an error-prone channel such as a wireless channel, and includes H.223 multiplexing, H.245 controlling, H.263 video CODEC
and 6.723.1 audio CODEC. Also, H.223 multiplexing is recommended as a method for multiplexing video, audio and other data in protocol data units (PDU) in order to realize a video telephone and video conferencing in a total digital telecommunication network by the ITU-T (the telecommunication standardization sector of the International Telecommunication Union). Also, the H.324 recommendation includes Mode 1 having high complexity and Mode 3 without having complexity. According to the Mode l, while generating a variable length packet an unequal error protection (UEP) is performed by adopting a rate compatible punctured convolutional (RCPC) encoder/decoder (CODEC) in an adaptation layer which is an upper layer. Also, an automatic request for retransmission (ARQ) is used to maintain the overall quality of service (QOS) even though the channel throughput decreases. However, the Mode 1 has a high complexity at a portion of RCPC CODEC, which increases the complexity of the overall system. Thus, it is difficult to implement a real-time process. Also, the total channel throughput of the system may decrease rapidly since it adopts a retransmission method. For example, the channel throughput is 50%a or less when the retransmission is performed one time, and 33 % or less when the retransmission is performed twice. Thus, it is difficult in Mode 1 of the H.324 to implement transcoding having compatibility with the conventional H.223. Meanwhile, Mode 3 has virtually no error-protection concept, so that error-resiliency in an error-t at prone channel is very low.
Disclosure of the Invention It is an object of the present invention to provide a multiplexing method for multimedia communication, enabling transcoding with the H:223 protocol by adding a flag which is similar to a pseudo noise code (PN CODE) after a high-level data link control (HDLC) flag in the multiplex-protocol data unit (MUX-PDU) by the H.223 protocol.
To achieve the object, there is provided a multiplexing method for multimedia communication in the H.223 protocol, comprising the steps of: (a) encoding media data;;.and .(b) multiplexing the media data encoded in the step (a) in units of a predetermined frame; and inserting a second flag having a predetermined length with an auto-correlation in the frame after a first flag having the opening and closing of the frame.
Preferably, the second flag of-the step (b) has a bit pattern of "10110010".
Brief Description of the Drawings FIG. 1 is a schematie block diagram of a device for implementing a multiplexing method for multimedia communication; compatible with the H.223 protocol, according to the present invention; , FIG. 2A is a diagram showing the structure of a general H.223 MLJX-PDU
frame; and FIG. 2B is a diagram showing tie structure of an H.~2~ X-PDU~ frame according to the present invention;
FIG. 3A is a diagram showing the structure of the H.~2~ ~=I'D~ free in a filling mode; and FIG. 3B is a diagram showing the swcture of the H.223' MUX PDU frame in an abort message mode.
Best mode for carrying out the Invention In FIG. 1 showing a device for implementing an H.223 multiplexing method for multimedia communication according to the present invention, a multiplexing ~. i s < .
portion 130 includes an H.223 protocol unit 110 and a transcoder 120. The H.223 protocol unit 110 and the transcoder 120 performs multiplexing with respect to encoded media data (video, audio and other data), passing through protocol data units (not shown) to transmit to a channel.
FIG. 2 is a diagram showing the structure of a general H.223 MUX-PDU
frame .
As shown in FIG. 2A, the H.223 MUX-PDU is constituted by units of~ a frame, and the frame includes a high-level data link control (HDLC) flag 110 for transmission control, a header 120 including data information, and a payload including video and audio data.
All MUX--PDU of the H.223 are defined using the HDLG flag 110 of FIG.
2A. The HDLC flag 110 has an unique bit pattern "01111110" having . six continuous " 1 s" representing the opening or closing of the frame, and is used for synchronization of the frame.
FIG. 2B is a diagram showing the structure of an H.223 MUX-PDU_ frame according to the present invention. The MUX-PDU frame includes an HDLG flag 140, an extra flag 150, a header 160 and a payload 170. The transcoder 120 inserts an 8-bit extra flag 150 which is similar to a pseudo noise code (PN
CODE) having a high auto-correlation next to the HDLC flag 150 as shown in FIG. 2B.
Here, the reason for selecting the extra flag having a bit pattern of "10110010" is due to its high auto-correlation as the PN CODE does. Thus, only the bit pattern of "10110010" may be added as the extra flag 150, or other bit streams having a high auto-correlation may be used thereas to increase error-resiliency. Also, a longer flag may be added in consideration of a trade-off with a channel band width.
Preferably, adding the extra flag, suggested by the present invention is used, is prevented in a filling mode in which HDLC flags exist continuously as shown in FIG. 3A or an abort message mode without having a payload as shown in FIG. 3B.
1'he multiplexing method for multimedia communication according to the present invention is not limited to the particular form illustrated and further modifications and alterations will occur to those skilled in the art. That is, interleaving and RCPC processes may be performed by using each extra flag of a plurality of MUX-PDUs. -Industrial A~nlicability As described above, in the multiplexing method for multimedia communication according to the present invention, MUX-PDU including an extra flag having a high auto-correlation is transmitted in the H.223 protocol, increasing the probability of detecting the MUX-PDU by a receiver. Thus, error-resiliency is also increased. Also, when the multiplexing method is used together with the RCPC and interleaving methods, error-resiliency can be further increased.
Claims (6)
1. A multiplexing method for multimedia communication in the H.223 protocol, comprising the steps of:
(a) encoding media data; and (b) multiplexing the media data encoded in the step (a) in units of a predetermined frame, and inserting a second flag having a predetermined length with an auto-correlation in the frame after a first flag having the opening and closing of the frame.
(a) encoding media data; and (b) multiplexing the media data encoded in the step (a) in units of a predetermined frame, and inserting a second flag having a predetermined length with an auto-correlation in the frame after a first flag having the opening and closing of the frame.
2. The multiplexing method of claim 1, wherein the frame further comprises:
a header having data information: and a payload having video and audio data.
a header having data information: and a payload having video and audio data.
3. The multiplexing method of claim 1, wherein the second flag of the step (b) has a bit pattern of "10110010".
4. The multiplexing method of claim 1, wherein the second flag of the step (b) is a pseudo noise code (PN CODE).
5. The multiplexing method of claim 1, wherein the multiplexing of the step (b) is performed together with an interleaving.
6. The multiplexing method of claim 1, wherein the second flag is inserted in the frame when a plurality of the first flags exist continuously or no payload exists in the frame.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/884,630 | 1997-06-27 | ||
US08/884,630 US6529528B1 (en) | 1997-06-27 | 1997-06-27 | Multimedia multiplexing method |
PCT/KR1998/000129 WO1999000988A1 (en) | 1997-06-27 | 1998-05-22 | Multimedia multiplexing method |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2295148A1 CA2295148A1 (en) | 1999-01-07 |
CA2295148C true CA2295148C (en) | 2003-07-08 |
Family
ID=25385020
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002295148A Expired - Lifetime CA2295148C (en) | 1997-06-27 | 1998-05-22 | Multimedia multiplexing method |
Country Status (14)
Country | Link |
---|---|
US (2) | US6529528B1 (en) |
EP (1) | EP1023808B1 (en) |
JP (2) | JP3342704B2 (en) |
KR (1) | KR100332327B1 (en) |
CN (2) | CN1159925C (en) |
AT (1) | ATE398891T1 (en) |
AU (1) | AU723813B2 (en) |
BR (1) | BR9811098B1 (en) |
CA (1) | CA2295148C (en) |
DE (1) | DE19882497B4 (en) |
ES (1) | ES2155042B1 (en) |
GB (1) | GB2341775B (en) |
RU (1) | RU2190307C2 (en) |
WO (1) | WO1999000988A1 (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000078197A (en) * | 1998-09-03 | 2000-03-14 | Toshiba Corp | Communication node and packet transfer method |
US6970602B1 (en) * | 1998-10-06 | 2005-11-29 | International Business Machines Corporation | Method and apparatus for transcoding multimedia using content analysis |
CA2317708A1 (en) * | 1998-11-02 | 2000-05-11 | Koninklijke Philips Electronics N.V. | Communication system using a multiplex signal carrying an auxiliary signal |
JP3855690B2 (en) * | 2001-02-20 | 2006-12-13 | 三菱電機株式会社 | Multiplexer, separator |
US7111221B2 (en) | 2001-04-02 | 2006-09-19 | Koninklijke Philips Electronics N.V. | Digital transmission system for an enhanced ATSC 8-VSB system |
US20030126269A1 (en) * | 2001-12-31 | 2003-07-03 | Globespanvirata Incorporated | System and method for automatically configuring a protocol line trace filter |
TWI307228B (en) | 2002-03-25 | 2009-03-01 | Asulab Sa | A method of transmitting information between two units each provided with means for sending and/or receiving signals |
EP1349306B1 (en) * | 2002-03-25 | 2013-10-16 | Asulab S.A. | Method of transmitting information between two units each capable of transmitting and receiving signals |
EP1349305A1 (en) * | 2002-03-25 | 2003-10-01 | Asulab S.A. | Method for transmission of information between two unitseach having means for transmission and/or reception of signals |
KR100474722B1 (en) * | 2003-02-13 | 2005-03-10 | 삼성전자주식회사 | A method for synchronizing data frames in digital communication system |
US7885337B2 (en) * | 2004-08-23 | 2011-02-08 | Qualcomm Incorporated | Efficient video slicing |
US20060062312A1 (en) * | 2004-09-22 | 2006-03-23 | Yen-Chi Lee | Video demultiplexer and decoder with efficient data recovery |
US9083972B2 (en) * | 2005-07-20 | 2015-07-14 | Humax Holdings Co., Ltd. | Encoder and decoder |
US7965736B2 (en) * | 2005-08-24 | 2011-06-21 | Qualcomm Incorporated | Transmission of multiplex protocol data units in physical layer packets |
KR100763207B1 (en) * | 2006-05-03 | 2007-10-04 | 삼성전자주식회사 | Method and apparatus for transmitting/receiving uncompressed audio/video data and transmission frame structure |
CN1960509B (en) * | 2006-08-29 | 2010-05-12 | 中兴通讯股份有限公司 | Method for implementing fault isolation in time of transferring media data of mobile multimedia broadcast |
US8379733B2 (en) * | 2006-09-26 | 2013-02-19 | Qualcomm Incorporated | Efficient video packetization methods for packet-switched video telephony applications |
US9357233B2 (en) * | 2008-02-26 | 2016-05-31 | Qualcomm Incorporated | Video decoder error handling |
TWI425838B (en) * | 2008-07-23 | 2014-02-01 | Inventec Appliances Corp | Data filter method |
CN101494933A (en) * | 2008-09-27 | 2009-07-29 | 嘉力时(集团)有限公司 | Method for recording DMX signal |
Family Cites Families (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4330858A (en) * | 1979-06-29 | 1982-05-18 | International Business Machines Corporation | Time domain supervisory channel for data terminal equipments |
US4495595A (en) * | 1981-04-03 | 1985-01-22 | Hitachi, Ltd. | Method and system of loop transmission |
US4622550A (en) * | 1982-04-28 | 1986-11-11 | International Computers Limited | Data communication system |
FR2526615A1 (en) * | 1982-05-10 | 1983-11-10 | Bodros Christian | HIGH-THROUGHPUT COUPLER BETWEEN A MULTIPLEX OF MIC CHANNELS AND A PACKET SWITCH |
USRE35104E (en) * | 1986-12-18 | 1995-11-28 | Mitsubishi Denki Kabushiki Kaisha | Subrate multi-media data transmission system |
US5124985A (en) * | 1988-12-13 | 1992-06-23 | Small Power Communication Systems Research Laboratories Co., Ltd. | Radiocommunication system using time-division digital frames |
FR2642245B1 (en) | 1988-12-30 | 1991-04-05 | Cit Alcatel | SYSTEM FOR RECEIVING AND PROCESSING OF HDLC FRAMES TRANSMITTED ON A MULTIPLEXED MULTIPLEXED MIC LINK, IN PARTICULAR FOR A DATA SWITCH |
JP2573738B2 (en) * | 1990-10-04 | 1997-01-22 | 株式会社小電力高速通信研究所 | Temporary address scheme in wireless communication system |
JP2636534B2 (en) * | 1991-03-22 | 1997-07-30 | 三菱電機株式会社 | Communications system |
US5229992A (en) * | 1991-03-28 | 1993-07-20 | Sprint International Communications Corp. | Fixed interval composite framing in integrated services networks |
JPH0710075B2 (en) | 1991-03-30 | 1995-02-01 | 株式会社小電力高速通信研究所 | Synchronization method in wireless communication system |
EP0544963A1 (en) | 1991-11-29 | 1993-06-09 | International Business Machines Corporation | Parallel processing method for receiving and transmitting HDLC/SDLC bit streams |
JPH0710075A (en) | 1993-06-28 | 1995-01-13 | Mitsubishi Heavy Ind Ltd | Hull supporting equipment |
JPH07250127A (en) | 1994-03-10 | 1995-09-26 | Fujitsu Ltd | Transmission timing adjustment device |
JP2748851B2 (en) * | 1994-03-15 | 1998-05-13 | 日本電気株式会社 | Data communication method and device |
US5534937A (en) * | 1994-04-14 | 1996-07-09 | Motorola, Inc. | Minimum-delay jitter smoothing device and method for packet video communications |
EP0791271B1 (en) * | 1994-11-11 | 1999-03-10 | Siemens Aktiengesellschaft | Method and system for transmitting facsimile-coded data between communications terminals with multimedia capability |
JPH08237173A (en) | 1994-12-13 | 1996-09-13 | Canon Inc | Spread spectrum communication system |
US5541919A (en) * | 1994-12-19 | 1996-07-30 | Motorola, Inc. | Multimedia multiplexing device and method using dynamic packet segmentation |
JPH09162846A (en) | 1995-12-05 | 1997-06-20 | Hitachi Denshi Ltd | Transmitting system by spread spectrum system |
JPH09214479A (en) | 1996-02-08 | 1997-08-15 | Toshiba Corp | Frame synchronization method and transmitter and receiver adopting the method |
US5768527A (en) * | 1996-04-23 | 1998-06-16 | Motorola, Inc. | Device, system and method of real-time multimedia streaming |
JPH1174868A (en) * | 1996-09-02 | 1999-03-16 | Toshiba Corp | Information transmission method, coder/decoder in information transmission system adopting the method, coding multiplexer/decoding inverse multiplexer |
US5966416A (en) * | 1996-11-21 | 1999-10-12 | Dsp Group, Inc. | Verification of PN synchronization in a spread-spectrum communications receiver |
JPH10178406A (en) | 1996-12-18 | 1998-06-30 | Matsushita Electric Ind Co Ltd | Multiplexed frame length changing method, synchronizing flag changing method and multiplexed header extracting method |
EP0861001B1 (en) * | 1997-02-07 | 2012-05-23 | Texas Instruments Incorporated | Error resilient video encoding |
US6404776B1 (en) * | 1997-03-13 | 2002-06-11 | 8 × 8, Inc. | Data processor having controlled scalable input data source and method thereof |
US6104726A (en) * | 1997-03-31 | 2000-08-15 | Motorola, Inc. | Simultaneous transfer of voice and data information using multi-rate vocoder and bit control protocol |
JP3337969B2 (en) | 1997-09-08 | 2002-10-28 | 沖電気工業株式会社 | Data transmitting device and data receiving device |
US6128313A (en) * | 1997-09-11 | 2000-10-03 | Cisco Technology, Inc. | Apparatus and method for filtering line noise and improper packet formatting |
US6034968A (en) * | 1997-09-22 | 2000-03-07 | Samsung Electronics Co., Ltd. | Adaptive multiplexing/demultiplexing method and multiplexer/demultiplexer therefor |
JP2000004184A (en) | 1998-06-16 | 2000-01-07 | Sekisui Chem Co Ltd | Method and device for establishing frame synchronization for spread spectrum communication |
JP2000078234A (en) | 1998-08-27 | 2000-03-14 | Nippon Telegr & Teleph Corp <Ntt> | Number defining method and data communication equipment |
JP3666285B2 (en) | 1999-02-01 | 2005-06-29 | 松下電器産業株式会社 | Electronic circuit |
JP3630590B2 (en) * | 1999-08-25 | 2005-03-16 | 沖電気工業株式会社 | Decoding device and transmission system |
-
1997
- 1997-06-27 US US08/884,630 patent/US6529528B1/en not_active Expired - Lifetime
-
1998
- 1998-05-22 GB GB9930303A patent/GB2341775B/en not_active Expired - Lifetime
- 1998-05-22 EP EP98921910A patent/EP1023808B1/en not_active Expired - Lifetime
- 1998-05-22 DE DE19882497T patent/DE19882497B4/en not_active Expired - Lifetime
- 1998-05-22 BR BRPI9811098-5B1A patent/BR9811098B1/en not_active IP Right Cessation
- 1998-05-22 WO PCT/KR1998/000129 patent/WO1999000988A1/en active IP Right Grant
- 1998-05-22 JP JP50546099A patent/JP3342704B2/en not_active Expired - Lifetime
- 1998-05-22 AU AU74566/98A patent/AU723813B2/en not_active Expired
- 1998-05-22 CA CA002295148A patent/CA2295148C/en not_active Expired - Lifetime
- 1998-05-22 KR KR1019997012105A patent/KR100332327B1/en not_active IP Right Cessation
- 1998-05-22 CN CNB988065568A patent/CN1159925C/en not_active Expired - Lifetime
- 1998-05-22 AT AT98921910T patent/ATE398891T1/en not_active IP Right Cessation
- 1998-05-22 ES ES009950085A patent/ES2155042B1/en not_active Expired - Fee Related
- 1998-05-22 CN CNB031081975A patent/CN100413346C/en not_active Expired - Lifetime
- 1998-05-22 RU RU99127319/09A patent/RU2190307C2/en active
-
2001
- 2001-06-25 US US09/887,332 patent/US7173946B2/en not_active Expired - Fee Related
- 2001-07-24 JP JP2001223562A patent/JP3524078B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP3342704B2 (en) | 2002-11-11 |
CN1159925C (en) | 2004-07-28 |
CN100413346C (en) | 2008-08-20 |
EP1023808B1 (en) | 2008-06-18 |
CN1520190A (en) | 2004-08-11 |
GB2341775A (en) | 2000-03-22 |
CN1261501A (en) | 2000-07-26 |
JP2000513917A (en) | 2000-10-17 |
DE19882497B4 (en) | 2005-10-27 |
US20010038650A1 (en) | 2001-11-08 |
KR100332327B1 (en) | 2002-04-12 |
WO1999000988A1 (en) | 1999-01-07 |
US6529528B1 (en) | 2003-03-04 |
JP3524078B2 (en) | 2004-04-26 |
ATE398891T1 (en) | 2008-07-15 |
AU723813B2 (en) | 2000-09-07 |
DE19882497T1 (en) | 2000-09-07 |
BR9811098A (en) | 2000-07-18 |
ES2155042B1 (en) | 2001-12-16 |
ES2155042A1 (en) | 2001-04-16 |
GB2341775B (en) | 2003-03-26 |
JP2002084246A (en) | 2002-03-22 |
AU7456698A (en) | 1999-01-19 |
BR9811098B1 (en) | 2013-12-31 |
CA2295148A1 (en) | 1999-01-07 |
KR20010014069A (en) | 2001-02-26 |
EP1023808A1 (en) | 2000-08-02 |
US7173946B2 (en) | 2007-02-06 |
RU2190307C2 (en) | 2002-09-27 |
GB9930303D0 (en) | 2000-02-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2295148C (en) | Multimedia multiplexing method | |
US6034968A (en) | Adaptive multiplexing/demultiplexing method and multiplexer/demultiplexer therefor | |
US6754277B1 (en) | Error protection for compressed video | |
KR100977930B1 (en) | Transmission of multiplex protocol data units in physical layer packets | |
CA2322715A1 (en) | Packet loss control method for real-time multimedia communications | |
JPH0490645A (en) | Voice packet assembly/diassembly equipment | |
JP2002524984A (en) | Method for organizing audiovisual coding information into a predetermined frame-structured transmission standard and terminal device therefor | |
JP2002016502A (en) | Information transmission device | |
GB2375275A (en) | Insertion of an additional flag with high auto correlation after HDLC flag in H.223 multiplex to improve detection and hence error resilience | |
JP2001292483A (en) | Mobile wireless communication system and method for supplying real time video data service | |
EP0946059A2 (en) | Method for transmitting videodata with mobile radio equipment |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |
Effective date: 20180522 |