CN1552159A - System and method for broadcast of independently encoded signals on ATSC channels - Google Patents
System and method for broadcast of independently encoded signals on ATSC channels Download PDFInfo
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
- H04N21/6437—Real-time Transport Protocol [RTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
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- 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
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234318—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by decomposing into objects, e.g. MPEG-4 objects
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- 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
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2365—Multiplexing of several video streams
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- 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
- H04N21/2381—Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
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- 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
- H04N21/426—Internal components of the client ; Characteristics thereof
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- 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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6112—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Television Systems (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The ATSC standard for digital television broadcast specifies a data Channel in addition to the normal audio and video channels. A methodology is provided for using the ATSC data Channel to broadcast MPEG-4 video streams, for which a new video service is created. The MPEG-4 streams can be encapsulated into MPEG-2PES (Packetized Elementary Streams) packets or directly into MPEG-2 transport packets. These mechanisms enable the synchronous broadcast of MPEG-4 streams for an ATSC digital TV system without a change to the ATSC standard when data casting. In a system for transmission of video and audio information, in which the system is constrained to operate pursuant to a given standard, including application of a given coding methodology, transmission of the information using a coding methodology that is independent of the coding methodology is provided through encoding the information into a plurality of increments (310) encoded according to the independent coding methodology; and encapsulating the encoded information increments into a payload portion (324) of transmission packets established according to the given standard.
Description
Related application
That the application requires to submit to July 23 calendar year 2001, exercise question is the rights and interests of No. the 60/307th, 201, the U.S. Provisional Patent Application of " broadcasting of the MPEG-4 on ATSC ground DM channel ", this application in this integral body in conjunction with reference.
Technical field
A kind of digital video broadcasting of relate generally to of the present invention is specifically related to be used for the application of the advanced encoder method of digital video signal.
Background technology
The compression algorithm by from strength to strength and realize that effectively corresponding improved exploitation in so needed digital processing ability of compression method satisfies lasting the increasing demand for the video throughput in limited transmission foundation structure.In the operation that described compression is handled, act on digitized video information at the transmission website by encoder, the compression algorithm of described encoder carry out desired, and produce video bit stream as output, the little transmission bandwidth of transmission bandwidth essence that described video bit stream need should need than original video signal information.After transmitting that compressed video bit stream to a receiving station, a decoder acts on described bit stream, and described decoder will compress handles counter-rotating, and recovers original video signal information.
Use by the current standard of the digital television broadcasting that is used for the U.S. of Advanced Television Systems Committee (ATSC) promulgation and to broadcast HDTV (high definition TV) business based on video and the audio compression of MPEG-2 (motion picture expert group).But, only can on using, support professional or 6 the single-definition business nearly of HDTV based on the 6MHz channel of MPEG-2 compression.The use of advanced video compress technique (such as MPEG-4) will make that same 6MHz channel can be effective at least twofold.For example can on a 6MHz channel, carry 2 high definition channels or 12 single-definition channels nearly.In addition, MPEG-4 supports to be used for sending to the device with small displays the channel of the low bit rate of signal.On the contrary, MPEG-2 efficient in sending with low bit rate is very low.Utilize MPEG-4 the 10th part coding, might send 1/4th VGA resolution with high-quality at 400Kbps.Because 1/4th VGA resolution roughly are the VCR quality, can on an ATSC 6MHz channel, send 50 such channels.
In addition, the advanced mistake that is used for MPEG-4 is recovered and scalable instrument makes and can set up firm video distribution system, and this is for normally difficult with the device of low bit stream work.But, because being limited to MPEG-2, the ATSC standard encodes work, therefore can not use the ATSC digital video of prior art to realize the advantage of MPEG-4.
Summary of the invention
The ATSC standard that is used for digital television broadcasting has also been specified data channel except common Voice ﹠ Video channel.A kind of method is provided for uses the ATSC data channel to broadcast the MPEG-4 video flowing, for the MPEG-4 video flowing, can set up new Video service.MPEG-4 stream can be encapsulated as MPEG-2 PES (packetizing flows substantially) or directly be encapsulated as MPEG-2 and transmit grouping.These mechanism make it possible to the MPEG-4 stream that synchronized broadcasting is used for ATSC numeral TV system, and do not change the ATSC standard when data broadcasting.The ATSC ground transmission system that one embodiment of the present of invention are used to broadcast MPEG-4 video and audio stream is used for moving and non-moving receiver.
Description of drawings
Fig. 1 is the senior illustrative of ATSC broadcast system;
Fig. 2 according to method of the present invention, be modified the senior illustrative of the ATSC broadcast system of work;
Fig. 3 provide according to one embodiment of the present of invention, to be used for the MPEG-4 data encapsulation be the illustrative of the method for the ATSC grouping that transmits stream;
Fig. 4 provide according to the second embodiment of the present invention, to be used for the MPEG-4 data encapsulation be the illustrative of the method for the ATSC grouping that transmits stream;
Fig. 5 provide according to the third embodiment of the present invention, to be used for the MPEG-4 data encapsulation be the illustrative of the method for the ATSC grouping that transmits stream.
Embodiment
In the U.S., provide HDTV and other advanced television services according to standard by Advanced Television Systems Committee (ASTC) promulgation, basic such standard be ASTC standard A/53, the ASTC digital television standard.In addition, as described in the background technology part, according to coding and the transmission of carrying out the digital television signal in ASTC Advanced Television system by the standard of the Motion Picture Experts Group's promulgation that is called MPEG-2, the standard of Motion Picture Experts Group's promulgation of the described MPEG-2 of being called formally is appointed as international standard ISO/IEC13818, the general coding of information technology-moving image and the audio-frequency information that is associated.(can notice the standard of U.S. HDTV, but this difference is not discussed) at this according to the audio coding different with MPEG-2.
The high level schematic diagram that the master subsystem of ATSC ATSC has been shown among Fig. 1 is separated.Can find out in this accompanying drawing that described system comprises: use (video/audio) coding and compression subsystem 101, serve multiplexed and transmit subsystem 102 and RF/ transmission subsystem 103.Described application coding and compression subsystem comprise video coding and compression 110 and audio coding and compression 112, and they are provided according to the ATSCA/53 standard.Except note Video Applications based on the details of Moving Picture Experts Group-2 and these input functions for those skilled in the art be known, have no need for further discussion ASTC video and audio coding and compression function at this.
Serve multiplexed work digital data stream is divided into packets of information with the multiplexed functional part 120 of service transmit subsystem, the unique identification that comprises each grouping or packet type, and grouping of stream of video packets, audio stream and data stream packet be multiplexed as single transmission stream.Transmitting function parts 122 use MPEG-2 to transmit stream protocol, and also will be illustrated in more detail below.Real-time clock 123 provides for the timing reference of transmitting function parts 122 with the multiplexed functional part 120 of service according to known principle.
RF/ sends subsystem (103) and comprises chnnel coding functional part 130, modulation function parts 132 and transmission medium 134, and it is carried out the known function of those skilled in the art, needn't further discuss at this.The output signal that sends subsystem from RF/ is sent to receiver (having decoder 136), and described signal by demodulation, decoding and decompression to recover original signal information.
The ATSC transmitting function comprises the grouping of use by the regular length of head identification based on the MPEG-2 system specifications.Special application bit stream of each head identification is also referred to as elementary bit stream, and it forms the payload of grouping.The application that is supported comprises video, audio frequency, data, program and system control information.The elementary bit stream that is used for video and audio frequency originally is called as the variable-length packets structure that packetizing flows (PES) substantially in transmitting to handle to be packaged in before.Share that the elementary bit stream of base is multiplexed as program when public.
The ATSC transmitting function is also abideed by MPEG-2 system coding standard, and wherein basic stream can be multiplexed as program flow or transmit stream.The one or more streams that divide into groups by the PES that will have common time base are combined as single stream and generating routine stream.Transmit stream will have one or more when independent one or more suites of base be single stream.Transmit the environment that stream also is designed to exist mistake, such as diminish or noisy media in transmission.
Be encapsulated as the payload of MPEG-2 transport stream packet via the data of ATSC data channel 114 (according to ATSC standard A/90) transmission.The A/90 standard has been considered various data transmission method for uplink, comprises that the synchrodata streaming transmits (Data Streaming) and data pipe transmits (Data Piping).Can be regenerated as on the meaning of synchrodata streaming transmission at receiver in data and clock, in described standard, synchronous data flow is defined as the streaming with the data that regularly require and transmit.Synchronous data flow and other data flow do not have strong timing link, and are carried in the PES grouping.It is to be used to be provided at the mechanism that MPEG-2 transmits any user-defined data in the stream that data pipe transmits by described standard definition.Utilize data pipe to transmit, data are directly inserted the payload of MPEG-2 transport stream packet.
According to principle of the present invention, data channel is set up the novel Video service that can be used for ATSC broadcasting by the adaptive MPEG-4 video flowing of accepting.The compression efficiency of MPEG-4 can be used to set up the more data channel subsequently, and sends data (otherwise it can not hold Video service) on the channel device that is used to have less display sizes, that have low bit rate very.
Video via the ATSC/MPEG-2 standard sends the video resolution that is limited between CCIR601 single-definition and HDTV resolution.This is opposite with the use according to the MPEG-4 stream on the ATSC data channel of principle of the present invention, the MPEG-4 stream on the ATSC data channel according to principle of the present invention is supported any frame of video resolution, comprises the display of the little handheld size type of use such as QCIF (1/4th general switch forms) or CIF (explanation picture format in the middle of general).
Fig. 2 shows and is arranged to realize senior illustrative principle of the present invention, encoder system.Functional part for corresponding to described system of Fig. 1 and subsystem uses common drawing reference numeral in this drawing.Except needs illustrate method of the present invention, do not further specify such public function parts at this.Referring to described accompanying drawing, concrete going up referring to data channel 114, Fu Jia video coding and compression function parts 115 and audio coding and compression function parts 116 are provided for the information that sends via data channel as can be seen.In an example embodiment of the present invention, use the MPEG-4 method to carry out such video and audio coding and compression (115 and 116), wherein new information is encoded as object video picture (VOP) according to the MPEG-4 scheme.
Can find out from described accompanying drawing that serve multiplexed functional part 120 and comprise: MPEG-2 serves multiplexed functional part 121, it is worked and carries out typical prior art MPEG-2 processing; The multiplexed functional part 124 of data, services, it receives the stream of MPEG-4VOP from MPEG-4 video encoder 115.The multiplexed functional part 124 of data, services uses PES grouping or RTP (real-time protocol (RTP)) grouping that MPEG-4 VOP and audio access unit are encapsulated into independently PES or rtp streaming.Explain processing below according to such packetizing of the MPEG-4 unit of method of the present invention.
The output of the multiplexed functional part 124 of data, services is provided to transport stream packet device 122, is used for transmitting stream to MPEG-2 and inserts multiplexed MPEG-4 VOP information.In an example embodiment of the present invention, MPEG-2 transport stream packet device is segmented into data flow the grouping of 188 bytes, distribute PID (the unique PID of Voice ﹠ Video), multiplexed various stream (audio frequency, video, data), and per 100 milliseconds or still less (specify by the ATSC standard) and insert PCR value.Certainly, the MPEG-2 transport layer is also served its other typical prior art functions, as (sync byte, the continuous counter etc.) of ATSC prescribed by standard.
Those skilled in the art can easily understand, set up with the decoder 136 of work receiving the decode the common operation that MPEG-2 transmits stream according to principle of the present invention except it, also comprise other disposal ability, be used to recover and decode and transmit the MPEG-4 data that stream encapsulates with MPEG-2.
The MPEG-4 video flowing can be encapsulated as ATSC normal data broadcasting grammer with multiple form.In two preferred embodiments of the present invention, realize broadcasting MPEG-4 stream via data channel by the method that the synchrodata streaming transmits or data pipe transmits.
The critical function that Fig. 2 serves multiplexed layer is and the transport layer of system synchronously supplemental audio and video pts value.When using the synchrodata streaming to transmit, the PES layer is carried out this function; Accordingly, when using data pipe to transmit, RTP carries out this function.
Now at length consider the encapsulation according to the MPEG-4 unit of principle of the present invention, described synchrodata streaming transmits embodiment and uses MPEG-2 PES and transport stream packet form.Each MPEG-4 object video picture (VOP) is by the PES packet encapsulation with variable-length.Therefore, each PES grouping begins with MPEG-4 VOP.These PES groupings are packaged into MPEG-2 then and transmit grouping.Utilize this method, need begin to locate the PES grouping what transmit grouping.This causes and will add that 0 fills to each VOP cycle.Using MPEG-2 to transmit the grouping adaptation fields realizes filling.The use of this filling is because MPEG-2 transmission grouping is the length of fixing; Therefore, in the beginning of next MPEG-2 transmission grouping, transmit placement 0 filling between beginning beginning, next MPEG-4 VOP of dividing into groups in the ending of MPEG-4 VOP with at next MPEG-2.The grouping of MPEG-4 VOP alignment is convenient in the easier VOP of receiver location because receiver can be only each MPEG-2 TS grouping begin check to determine whether that there be (so MPEG-4 VOP exists) in the PES grouping.
Schematically illustrate among Fig. 3 and use the synchrodata streaming to transmit the processing that the MPEG-4 video data is encapsulated as MPEG-2 transmission stream.In this accompanying drawing, the sequence of the PES grouping 310 of encapsulation MPEG-4 VOP is illustrated and puts at MPEG-2 and transmits on the sequence of grouping 320.Each of PES grouping 310 comprises PES head 312-i, synchrodata head 314-i and MPEG-4 object video picture (VOP) 316-i (wherein i represents the packet index number).Transmit in the stream 320 at MPEG-2, each transmits grouping and constitutes (again, wherein i represents the packet index number) by transmitting head 322-i and transmitting payload 324-1.
According to principle of the present invention, the content of each PES grouping is encapsulated as the payload portions that transmits packet sequence, and add that to the final transmission grouping in described sequence 0 fills, to be filled in that final any remaining bits that transmits in the payload portions of dividing into groups.Consider explaining the situation shown in the accompanying drawing, the first that constitutes a fraction of initial p ES grouping of PES head 312-1, synchrodata head 314-1 and MPEG-4 VOP 316-1 is packaged into the payload portions of first graphic transmission grouping, that is, transmit payload 324-1.The next part of MPEG-4 VOP 316-1 is packaged into the next payload portions that transmits grouping subsequently,, transmits payload 324-2 that is.The remainder of MPEG-4 VOP316-1 is packaged into the 3rd subsequently and transmits the payload portions of grouping,, transmits payload 324-3 that is, and is added to 0 the filling 326-3 and fill remaining bit of payload portions of that grouping.
Will be seen that the next PES grouping that constitutes PES head 312-2, synchrodata head 314-2 and MPEG-4 VOP316-2 will be packaged into that payload 324-4 begins to transmit, as to transmit the grouping payload next sequence subsequently.
The PES head comprises and the relevant demonstration time mark (PTS) of timer reference of programs (PCR) in transmitting head.This PTS is synchronous with MPEG-4 video flowing and system time.Audio frequency PES grouping also comprises the audio frequency PTS relevant with transport layer PCR.Therefore the PES grouping also comprises the audio frequency PTS relevant with transport layer PCR.Therefore, Voice ﹠ Video by having the identical baseline system time (transport layer PCR) synchronously
The synchrodata head that this pattern of ATSC data broadcast standard needs is included in (one of each VOP) in each PES head.Described synchrodata comprises for 8 bit expanded of PTS field and the data transfer rate parameter of selecting for use.
Transmit embodiment for data pipe, notice once more that the ATSC data pipe transmits to make the data of any kind can be encapsulated in that MPEG-2 transmits in the grouping and without any the mechanism that limits.Make data pipe transmit without limits and can use than using the synchrodata streaming to transmit the more effective method that is used to encapsulate the MPEG-4 bit stream.But, show that time mark (PTS) still is used for each frame of video and each audio frame.Preferably will be used in based on the agreement of RTP among the whole embodiment-be that each MPEG-4 VOP uses the RTP head with time mark. for this reason,As is known, the RTP head comprises the time mark parameter of 32 bits.
Schematically illustrate among Fig. 4 and use data pipe to send the processing that the MPEG-4 video data is encapsulated into MPEG-2 transmission stream.In this accompanying drawing, the sequence of the RTP grouping 410 of encapsulation MPEG-4 VOP is illustrated and puts at MPEG-2 and transmits on the sequence of grouping 420.Each grouping in the RTP grouping comprises RTP head 412-i and MPEG-4 VOP 416-i (wherein i represents the packet index number).Transmit in the stream 420 at MPEG-2, each transmits grouping and constitutes (again, wherein i represents the packet index number) by transmitting head 422-i and transmitting payload 424-i.Similar with the method for packing that is used for synchrodata streaming transmission shown in Figure 3, the content of each RTP grouping is packaged into the payload portions of the sequence that transmits grouping, and have 0 filling that adds to the last transmission grouping in the described sequence, to be filled in that final any remaining bits that transmits in the payload portions of dividing into groups.As an illustration, as shown in this figure, RTP head 412-1 is encapsulated among the transmission payload 424-1 with the part of MPEG-4 VOP 416-1, the next part of MPEG-4 VOP 416-1 is encapsulated in and transmits among the payload 424-2, and the decline of MPEG-4 VOP 416-1 is encapsulated in and transmits among the payload 424-3.As shown in this figure, use 0 filling 426-3 (under situation about transmitting) to align with the VOP head in transmission payload level so that will transmit head in the synchrodata streaming.
It should be noted that accurate mechanism in the present embodiment, that be used to realize to have the PTS of RTP only is illustrative, and principle of the present invention be intended to consider with by any such mechanism based on the format compatible of the system definition of RTP.In this, should also be noted that RTP standard (IETF/RFC1889) is included in PT Payload Type (PT) parameter in the head.Therefore, existence is for the particular version (other RFC) of different application definitions.For example, IETF/RFC3016 has specified and a kind of the MPEG-4 Voice ﹠ Video has been encapsulated into possible mode in the RTP grouping.For an example embodiment of the present invention, also can realize this RFC3016 encapsulation means (as described below).But other known RFC that are understood that the RTP packetizing agreement that is used to define MPEG-4 are also in limit of consideration of the present invention, and the such RTP packetizing agreement that is used for MPEG-4 that may develop later on is also in limit of consideration of the present invention.For example, have the new RFC that still is in draft-form, they limit the RTP packetizing of MPEG-4 the 10th partial video, and it should be taken as in the limit of consideration that limits principle of the present invention.
In above-mentioned illustrational RFC3016 encapsulation means, the time mark parameter uses the benchmark of (in the acquiescence mode) 90KHz to be used for its time mark.This is consistent with the 90KHz benchmark that uses in the ATSC standard.Therefore, PCR and PTS field will be based on the same clock cycle under this exemplary scenario.But, in the RTP implementation that substitutes, do not require that the PTS field has the reference clock identical with the ATSC90KHz clock.To carry out conversion for different reference clocks from a sampling rate to another.Described conversion is carried out as the direct ratio from a clock zone to another.For example, if employed Real-time Transport Protocol defines the PTS benchmark of 80KHz clock, then PTS will be calculated as the product of PCR clock and mark 8/9, and PCR and PTS clock will synchronously be reset to 0 by encoder.
In an alternate embodiment, eliminated at above-mentioned data pipe and transmitted among the embodiment for 0 requirement of filling.In this alternate embodiment, RTP grouping is packed and do not require and transmit grouping and align.The method for packing that is used for this alternate embodiment schematically is illustrated in Fig. 5, and wherein as the method for Fig. 4, the sequence of the RTP grouping of encapsulation MPEG-4 VOP 510 is illustrated and puts on MPEG-2 transmits the sequence of grouping 520.It is evident that from accompanying drawing RTP stream of packets 510 and 520 the structure that transmits stream are corresponding to RTP shown in Figure 4 and transmit the structure of stream.But,, do not require with aliging of VOP packet header for transmitting head unlike the method for Fig. 4.Therefore, can be placed on from the bit that begins to locate of given VOP grouping in the transmission payload of same transmission grouping of the end bit that comprises previous VOP grouping, therefore eliminate in the embodiment of Fig. 4 employed for 0 requirement of filling.
But the means of noting this alternate embodiment require to set up a kind of method that is used to locate the RTP head of unjustified grouping.As signal means to this requirement, can be with a pointer definition for transmitting first byte of payload, perhaps the expansion to the RTP head can comprise the pointer of selecting for use.But other such means are conspicuous to those skilled in the art, and all such means are intended to be included in the scope of the present invention.
When not using the grouping alignment, eliminated the channel capacity of the waste that is generally used for filling.Therefore, on average saved each frame 184/2=92 byte.Depend on the size and the employed bit rate of source material, this saving may be important.Under high-resolution situation, the relative scale of the bandwidth of waste is less.But, when method of the present invention is used for less resolution or frame rate, might only need some to transmit grouping by each frame.In this case, can save the channel width of 20-30%.But should be noted that these bandwidth conservation means are that synchrodata streaming transmission embodiment can not obtain, because that form forces to use PES.
According to above-mentioned explanation, multiple improvement of the present invention and alternate embodiment are conspicuous to those skilled in the art.On concrete, should be understood that and use MPEG-4 coding/compression standard to illustrate that principle of the present invention only is a preferred embodiment.Method of the present invention is intended to be included in the limit of consideration of the present invention for the application of other or other advanced video compression method.
Therefore, this explanation is appreciated that it only is illustrative, is used for carrying out best mode of the present invention to professor those skilled in the art, and is not intended to the possible form that illustrates that they are all.Also can understand, employed vocabulary is illustrative vocabulary rather than determinate vocabulary, and can under the situation that does not break away from spirit of the present invention, change the details of structure substantially, and be retained in all interior improved special uses of scope of appended claim.
Claims (22)
1. in a system that is used for sending video and audio-frequency information, wherein said system is restricted to according to given standard operation, described given standard comprises uses given coding method, a kind of method that is used to use the coding method that is independent of described given coding method to send described information, described method comprises step:
Described information is encoded to a plurality of increments 310,410,510 of encoding according to described independently coding method;
The information increment that is encoded is encapsulated as the payload portions 324,424,524 of the transmission grouping of setting up according to described given standard.
2. according to the process of claim 1 wherein that described packed coded message increment preserves control and the timing information that is used for described given coding method.
3. according to the process of claim 1 wherein described given standard by Advanced Television Systems Committee promulgation, and described given coding method is MPEG-2.
4. according to the process of claim 1 wherein that described independently coding method is MPEG-4.
5. send information according to the process of claim 1 wherein according to the described transmitting system of synchrodata streaming tranmission techniques cause.
6. send information according to the process of claim 1 wherein according to the described transmitting system of data pipe tranmission techniques cause.
7. according to the method for claim 6, wherein be packaged in the grouping of setting up according to real-time protocol (RTP) by the described information of described absolute coding method coding.
8. according to the method for claim 7, the head of wherein said coded message is alignd with the transmission head of given grouping.
9. according to the method for claim 8, wherein use 0 filling 326,426 to realize the alignment of described message header and described transmission head.
10. according to the method for claim 7, the described packet encapsulation of wherein said coded message is independent of the delivery time benchmark.
11. encoding-multiplexing system, be arranged to according to given standard code video and audio-frequency information, described given standard comprises uses given coding method, described system and be arranged to described coded message is encapsulated as one or more transmission stream, described encoding-multiplexing system comprises:
Independently information channel 114, are used for handling the information flow that is encoded as a plurality of increments according to the coding method different with described given coding method;
Be used for the information encoded increment of described information flow 124 is encapsulated into the device of the payload portions of the transmission grouping of setting up according to described given standard.
12. according to the encoding-multiplexing system of claim 11, the wherein said device that is used to encapsulate also is used to preserve the control and the timing information of described given coding method.
13. the encoding-multiplexing system according to claim 11 wherein comes transmission information according to the data pipe transfer approach, and the described coded message increment of wherein encoding by described different coding method is packaged in the grouping of setting up according to real-time protocol (RTP).
14. according to the encoding-multiplexing system of claim 13, the head of wherein said coded message is alignd with the transmission head of given grouping.
15. according to the encoding-multiplexing system of claim 14, the described alignment of wherein said message header and described transmission head realizes by using 0 filling.
16. according to the encoding-multiplexing system of claim 13, the described packet encapsulation of wherein said coded message increment is independent of the delivery time benchmark.
17. a decoder 136 comprises:
Processing unit, be arranged at the input Receiving coded information, described coded message quilt is according to given standard code and transmission, and described given standard comprises uses given coding method, and described processing unit also is arranged to export the signal of representing described code signal substantially before coding;
Wherein said processing unit also is used to receive the coded message of encoding by the coding method that is independent of described given coding method, and the signal of described absolute coding signal is represented in output substantially before coding;
Wherein the incremental portion of the described absolute coding information that receives by described second processing unit is packaged in the payload portions of the transmission grouping of setting up according to described given standard.
18. according to the decoder of claim 17, wherein the described incremental portion of the described absolute coding information that is received by described second processing unit is preserved control and the timing information that is used for described given coding method.
19. decoder according to claim 17, wherein according to the data pipe tranmission techniques, be sent to described decoder by described absolute coding method coding and the information that receives by described processing unit, and the described incremental portion of wherein said absolute coding information is packaged in the grouping of setting up according to real-time protocol (RTP).
20. according to the decoder of claim 19, the head of wherein said absolute coding information is alignd with the transmission head of given transmission grouping.
21. according to the decoder of claim 20, the described alignment of wherein said message header and described transmission head is to use 0 filling to realize.
22. according to the decoder of claim 19, the described packet encapsulation of wherein said absolute coding information increment is independent of the delivery time benchmark.
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| US30720101P | 2001-07-23 | 2001-07-23 | |
| US60/307,201 | 2001-07-23 |
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| CNA02817514XA Pending CN1552159A (en) | 2001-07-23 | 2002-07-19 | System and method for broadcast of independently encoded signals on ATSC channels |
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| JP (1) | JP2004537226A (en) |
| KR (1) | KR20040017830A (en) |
| CN (1) | CN1552159A (en) |
| BR (1) | BR0211406A (en) |
| MX (1) | MXPA04000744A (en) |
| WO (1) | WO2003010975A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104255036A (en) * | 2012-03-23 | 2014-12-31 | 数码士控股有限公司 | Hybrid delivery method and reception method for mmt packaged svc video contents |
| CN108882054A (en) * | 2017-05-10 | 2018-11-23 | 上海交通大学 | Datagram header structure and packaging method for STL-SFN transmission process |
| CN109275035A (en) * | 2016-03-01 | 2019-01-25 | 夏普株式会社 | The method of the opaque user data of signaling |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100619034B1 (en) * | 2004-06-19 | 2006-08-31 | 삼성전자주식회사 | Data synchronization method in digital multimedia data receiver and apparatus therefor |
| JP2006262319A (en) * | 2005-03-18 | 2006-09-28 | Toshiba Corp | Broadcast signal sending system |
| KR101469315B1 (en) | 2006-05-11 | 2014-12-08 | 톰슨 라이센싱 | Method and apparatus for transmitting data |
| BRPI0805829B1 (en) | 2007-05-14 | 2020-05-26 | Samsung Electronics Co., Ltd | METHOD OF TRANSMITTING A MOBILE DIFFUSION SERVICE, AND APPLIANCE FOR TRANSMITTING A MOBILE DIFFUSION SERVICE |
| WO2008156257A2 (en) * | 2007-06-18 | 2008-12-24 | Samsung Electronics Co., Ltd. | Method and apparatus for transporting mobile broadcasting service, and method and apparatus for receiving mobile broadcasting service |
| US8995353B2 (en) | 2007-10-09 | 2015-03-31 | Samsung Electronics Co., Ltd. | Method and apparatus for transmitting broadcast data and method and apparatus for receiving broadcast data |
| KR101711937B1 (en) | 2010-12-03 | 2017-03-03 | 삼성전자주식회사 | Apparatus and method for supporting variable length of transport packet in video and audio commnication system |
| KR20160082803A (en) | 2014-12-29 | 2016-07-11 | 주식회사 미래텍 | Olefin block copolymer composition, foam and console for automotive interior material and preparation thereof |
| CN106233703B (en) * | 2015-02-27 | 2021-07-09 | 索尼公司 | Receiving apparatus, receiving method, transmitting apparatus, and transmitting method |
| US10555010B2 (en) | 2016-08-24 | 2020-02-04 | Liquidsky Software, Inc. | Network-enabled graphics processing module |
| CN112599138B (en) * | 2020-12-08 | 2024-05-24 | 北京百瑞互联技术股份有限公司 | Multi-PCM signal coding method, device and medium of LC3 audio coder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100248427B1 (en) * | 1997-08-12 | 2000-03-15 | 이계철 | Method and device for spliting screen for mpeg video on the compressed domain |
| KR100312421B1 (en) * | 1998-11-25 | 2001-12-12 | 오길록 | A conversion method of the compressed moving video on the video communication system |
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- 2002-07-19 BR BR0211406-2A patent/BR0211406A/en not_active Withdrawn
- 2002-07-19 CN CNA02817514XA patent/CN1552159A/en active Pending
- 2002-07-19 EP EP02750184A patent/EP1421796A4/en not_active Withdrawn
- 2002-07-19 WO PCT/US2002/023031 patent/WO2003010975A1/en active Application Filing
- 2002-07-19 JP JP2003516227A patent/JP2004537226A/en not_active Ceased
- 2002-07-19 MX MXPA04000744A patent/MXPA04000744A/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104255036A (en) * | 2012-03-23 | 2014-12-31 | 数码士控股有限公司 | Hybrid delivery method and reception method for mmt packaged svc video contents |
| CN109275035A (en) * | 2016-03-01 | 2019-01-25 | 夏普株式会社 | The method of the opaque user data of signaling |
| CN108882054A (en) * | 2017-05-10 | 2018-11-23 | 上海交通大学 | Datagram header structure and packaging method for STL-SFN transmission process |
| CN108882054B (en) * | 2017-05-10 | 2020-12-01 | 上海交通大学 | Data packet structure and encapsulation method for STL-SFN transmission process |
Also Published As
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| MXPA04000744A (en) | 2004-04-20 |
| JP2004537226A (en) | 2004-12-09 |
| WO2003010975A1 (en) | 2003-02-06 |
| EP1421796A1 (en) | 2004-05-26 |
| EP1421796A4 (en) | 2008-07-09 |
| BR0211406A (en) | 2004-08-17 |
| KR20040017830A (en) | 2004-02-27 |
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