CN100426853C - Data structure of virtual channel table and transmission flow judging method - Google Patents
Data structure of virtual channel table and transmission flow judging method Download PDFInfo
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- CN100426853C CN100426853C CNB2005100355601A CN200510035560A CN100426853C CN 100426853 C CN100426853 C CN 100426853C CN B2005100355601 A CNB2005100355601 A CN B2005100355601A CN 200510035560 A CN200510035560 A CN 200510035560A CN 100426853 C CN100426853 C CN 100426853C
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Abstract
The invention is related to extending syntactic structure of terra virtual channel table (TVCT) in PSIP specification of ATSC passed through prescribed digital TV standard. Using TVCT can distinguish VCT data structures of stream transferred in channel, and methods for distinguishing transmission streams. In particular, through appending description of component name string about stream to service location descriptor in TVCT, using TVCT only can distinguish how many streams are transferred in a channel. Thus, user of digital TV receiver can select streams rapidly.
Description
Technical field
The present invention relates to ATSC (Advanced TelevisionSystems Committee: the content of the PSIP Advanced Television committee) (Program and SystemInformation Protocol: program and system information protocol) aspect by the standard code of digital TV, be particularly related to by expanding surface wave virtual channel table (TVCT) syntactic structure, only, can flow method of discrimination in channel to the transmission that the stream that transmits is classified by TVCT.
Background technology
Now, adopt the country of digital broadcasting specification----ATSC specification that the U.S., Korea S, Canada are arranged.In above-mentioned ATSC specification, except the specification of audio/video coding and decoding having been carried out definition,, guarantee to find the audio frequency, the video that in channel, transmit in order to search the channel of hope, the specification that is called as PSIP is also defined.Above-mentioned PSIP is a kind of digital TV that formulates for the ATSC group of watching the U.S., must transmit the stipulations of the additional information that it comprised.
Electronic program guides) and SI (System Information: system information) be defined as that is, PSIP is with EPG (Electronic Program Guide:.Above-mentioned PSIP is as the specification of the ATSC of terrestrial broadcasting and wireless cable digital broadcasting, by MPEG-2 (Moving PictureExperts Group; ISO/IEC 13818-1 system) method to there not being information encoded analysis,, defines (1997 DEC.document A/65) for the multiple information of program is provided.That is, above-mentioned PSIP specification is based on MPEG-2 (ISO/IEC 13818-1) specification, and tables all in PSIP define according to private section syntax (private part grammer).
The A/V data that this PSIP transmission/reception is made according to MPEG-2 video and AC-3 audio format for the channel information that transmits each TV station and the programme information of each channel etc., are made of a plurality of tables.And above-mentioned PSIP has can support to select channel, and the navigation feature of the A/V service of wishing broadcasting and the EPG function of support broadcast program are provided.That is, support the additional function of broadcasting guide service.
Fig. 1 is the schematic diagram of common PSIP structure.
The channel information that carries out channel selection transmits by virtual channel table (Virtual Channel Table:VCT) with the packet identifier information such as (PID:Packet Identifier) of carrying out the A/V reception, and the EPG information of the TV programme of each channel is by EIT (Event InformationTable: Event Information Table) transmit.That is,, can know the PID that is loaded in the Voice ﹠ Video of the TV programme in the channel with channel designation, channel number etc. if above-mentioned VCT is analyzed.System time table), RRT (the Rating Region Table: the hierarchical region table) that transmits of information such as program grade zone and review office in addition, in above-mentioned PSIP, has STT to temporal information (SystemTime Table:.And, expanded text table), also comprise annotated ETT (the Extended Text Table: of channel and TV programme to MGT (the Master Guide Table: main guide table) of the version of each table and PID management.These tables utilize the data structure of the section of being called as to transmit.
That is, above-mentioned table all has the base unit of the section of being called as, and with more than one section combination, constitutes a table.
VCT can be divided into 256 sections.And a section can be loaded a plurality of virtual channel information, and the information of a virtual channel can not be divided into plural section.
Fig. 2 is the common surface wave recorded and narrated in the A/65 schematic diagram with the bitstream syntax (syntax) of VCT (TVCT).That is, in basic VCT, comprise transport stream ID, channel number (main, less important), channel designation, carrier frequency, program numbers etc., the information of appending is included in the VCT narration word.
From Fig. 2 we as can be seen, TVCT has the table identifier (table_id) of 0xC8, the PID of TVCT is 0x1FFB.Version_number shows the version value of VCT, and section_number shows the number of this section, and last_section_number shows the number of the back segment of complete VCT.Num_channels_in_section has specified the number of the whole virtual channels that exist in above-mentioned VCT section.
And, showing virtual channel name at the short_name of ' for ' circulation, major_channel_number shows " mainly " channel number that links to each other with virtual channel.Each virtual channel number should with mainly be connected with the secondary channel number, main, secondary channel number can be used as user's cross reference number of relevant virtual channel.
Program_number is used to connect MPEG-2 PAT (Program AssociationTable: program in parallel table) and PMT (Program Map Table: Ding Yi virtual channel Program Map Table), it is consistent with program numbers in above-mentioned PAT/PMT.Here, PAT records and narrates the inscape of program to each program numbers, points out to transmit the PID of the transport tape packets of information of PMT.Above-mentioned PMT has recorded and narrated the PID detail and the additional information of the transport packet that individual bits biographies such as the video that constitutes program identification number and program, audio frequency send.
Source_id shows the program source that is connected relevant virtual channel.Here, so-called source refers to particular sources such as image, text, data and sound equipment.
The source_id value has unique value in the transport stream that transmits TVCT.
Descriptor_length shows the whole length of the narration word of relevant virtual channel, and additional_descriptor_length shows the whole length of all VCT narration words.That is, above-mentioned TVCT reads the data of each virtual channel by ' for ' circulation.
On the other hand, descriptor circulation (the descriptor loop that circulates at next ' for '; Descriptor{}) on, can comprise service location descriptor (positioning service descriptor), extended channel name descriptor (extended channel name descriptor), time-shiftedservice descriptor (moving service descriptor after the time).Here, what deserves to be mentioned is that the video of broadcast program, audio frequency PID are loaded in the service location descriptor.
Fig. 3 is included in the schematic diagram of the bitstream syntax structure of the service location descriptor among the TVCT of Fig. 2.On above-mentioned service location descriptor, comprise the PCR_PID that the PID of the effective PCR stream that uses in the program to program_number indication shows.And, in ' for ' circulation, comprise the type of each stream (audio frequency, video and data), show that related streams is elementary_PI, the language of coming in by which PID.
And, since transmit stream be 0 and 1 enumerate----bit stream form, can not judge and transmit that to flow to the end be audio frequency, video, or data.At this moment, utilize the information in the above-mentioned service locationdescriptor, can distinguish the kind that transmits stream.
That is,, can carry out 1 differentiation,, can utilize language to carry out 2 times and distinguish for identical stream type to transmitting stream according to above-mentioned stream type.Under the situation of video, because in the ATSC specification, be defined in the channel and only should have a video, so, only, just can distinguish video by stream type.
But, under the situation of audio frequency, to distinguish even carried out 1 time, after 2 differentiations, the situation that can not differentiate types of audio happens occasionally.For instance, when existing 2 language to be the audio frequency of korean, only, can not distinguish above-mentioned audio frequency by stream type above-mentioned and language.
The method that can distinguish above-mentioned audio frequency is to utilize the component name descriptor (composition name descriptor) of the PMT of PSI (ProgramSpecific Information) transmission of passing through the MPEG-2 specification.
Fig. 4 is the schematic diagram of the bitstream syntax of above-mentioned component name descriptor.It can comprise the character string of description.
Promptly, as shown in Figure 5, in the stream that defines in the PMT by servicelocation descriptor in the TVCT of PSIP specification bitstream syntax and PSI specification, search stream type and PID homogeneous turbulence mutually, can realize the mapping of the component name descriptor of the service location descriptor of TVCT and PMT.
At first, TVCT and the PAT with identical program_number mated.For instance, if want to differentiate the stream that program_number is 20 TVCT, as long as with program_number be that 20 PAT mates just passable.In Fig. 5, from program_number be in 20 the TVCT service location descriptor as can be seen, stream type is that the PID of the stream of video is 0x100.But stream type is that audio frequency exists two stream ID.That is, existence stream ID is that audio frequency and the stream ID of 0x101 are the audio streams of 0x102.Two audio stream language are identical, all are kor.Therefore, only, can not distinguish two audio streams by the servicelocation descriptor in the above-mentioned TVCT.
In the PAT (that is, program number=20) that mates with above-mentioned TVCT, insert PMT_PID (for example, 0x10).Therefore, as can be seen, above-mentioned PMT_PID comprises the component namedescriptor that shows among stream type information and PID and Fig. 4 from the PMT of 0x10.Therefore, if the analysis stream type is the component name descriptor of audio frequency, can finally distinguish two audio streams.
By this method, can distinguish stream with same type, same-language.
Summary of the invention
Therefore, in above-mentioned PSIP specification,, not only require to receive the PSIP table, also require to receive the PSI table simultaneously for this mapping.That is,, should both receive TVCT, also receive PAT/PMT in order to distinguish the stream that in channel, transmits.Therefore, the user who has digital TV receiver also needs the problem of waiting for that PAT/PMT receives in order to select audio frequency.
In order to address the above problem, the objective of the invention is provides among the TVCT that a kind of extension packets is contained in the PSIP specification for the user, the service location descriptor that transmits only by TVCT, can distinguish the VCT data structure of the stream that transmits and transmit the stream method of discrimination in channel.
The embodiment that the present invention transmits the stream method of discrimination comprises following several stages, and as feature: in the service of VCT location descriptor, the information whether supplemental instruction of the stream type of insertion and transmission broadcast program, elementary_PID, language message, expression stream exists, and show that in described information supplemental instruction about stream when existing, inserts and transmit the annotated transfer phase of described stream together; If there is the supplemental instruction about stream in above-mentioned information bit indication in service locationdescriptor, then utilize stream type, language message and supplemental instruction in the above-mentioned service locationdescriptor, distinguish the reception stage of the kind of the stream that in a channel, transmits about flowing.
The feature in above-mentioned reception stage is: if there is not the supplemental instruction about stream in the indication of above-mentioned information bit in service locationdescriptor, then only utilize stream type, language message in the above-mentioned service locationdescriptor, distinguish the kind of the stream that in a channel, transmits
Other purposes of the present invention, feature and advantage will can fully understand by the detailed description of accompanying drawing to embodiment.
The present invention transmits the information whether the stream method of discrimination exists by the supplemental instruction that appends expression stream in the service of TVCT location descriptor, and show that in described information supplemental instruction about stream is when existing, insert and transmit the supplemental instruction of described stream together, only, can distinguish a plurality of streams that in a channel, transmit by TVCT.Especially, only, can distinguish stream type, language phase homogeneous turbulence by above-mentioned TVCT.Therefore, the user of digital TV receiver can flow selection fast.
Description of drawings
Fig. 1 is the schematic diagram of common PSIP structure;
Fig. 2 is the schematic diagram that VCT bitstream syntax structure is used in common terrestrial broadcasting;
Fig. 3 is included in the schematic diagram of the bitstream syntax structure of the service location descriptor among the TVCT of Fig. 2;
Fig. 4 is the schematic diagram of the bitstream syntax structure of the component name descriptor of definition in the PMT of PSI specification;
Fig. 5 is the service location descriptor of existing TVCT and the schematic diagram of PMT mapping example;
Fig. 6 is the schematic diagram of the bitstream syntax structure of the service location descriptor that defines in TVCT of the present invention;
The schematic diagram of the bitstream syntax structure of the multiple string structure that Fig. 7 defines in the PSIP specification;
Fig. 8 is the service location descriptor that the present invention only uses TVCT, judges the schematic diagram of the example of stream kind;
Fig. 9 is the generalized schematic that flows the digital TV receiving system of differentiation among the present invention
Accompanying drawing major part symbol description
110: tuner 120:TP multiple signals separated part
130: audio decoder 140: Video Decoder
150:PSIP decoder 160:PSI decoder
Embodiment
Below, structure and the effect to the embodiment of the invention is illustrated with reference to the accompanying drawings.Structure of the present invention and effect according to description of drawings describe as just an embodiment, and above-mentioned technological thought of the present invention and core constitute and effect is not limited thereto.
Fig. 6 is the schematic diagram of the bitstream syntax structure of the service location descriptor that defines in TVCT of the present invention.
The difference of service location descriptor of the present invention and existing service locationdescriptor is: except stream type, PID, language, also appended stream_desc and component_name_string () on elementarystreamloop.
That is, will not use territory (reserved) to narrow down to 2, in remaining 1, distribute stream_desc by 3.Above-mentioned stream_desc shows 1 mark (bit flag) that whether exists about the supplemental instruction (component name string) of stream.Here, what deserves to be mentioned is that 1 is an embodiment, also can all distribute 2 and 3 that do not use the territory, represent whether the supplemental instruction (component_name_string) that flows exists.
The above-mentioned component_name_string () that appends has the form of many string structures (multiple stringstructure).Promptly, if the supplemental instruction (component_name_string) of stream is included among the above-mentioned service location descriptor, above-mentioned stream_desc is 1, if be not included among the above-mentioned service location descriptor, stream_desc is 0.
Therefore, differentiate the kind time-like of the bit stream that receives,, utilize stream type and elementary_PID and component_name_string () to differentiate if above-mentioned stream_desc is 1.And, if above-mentioned stream_desc is 0,, only utilize stream type and elementary_PID to differentiate owing to there is not component_name_string ().
As shown in Figure 7, above-mentioned component_name_string () is the same with the componentname descriptor of PMT, has the form of the many string structures that define in PSIP.
The reason that originally transmits TVCT provides the information of channel.But in the present invention, transmitting TVCT is for tuning fast, expands the service locationdescriptor in the TVCT.That is,, TVCT and PAT/PMT need not be all received, only, a plurality of streams that in channel, transmit can be distinguished by TVCT by in the service of TVCT location descriptor, appending the component name string that defines in the PMT.Therefore, when the user of digital TV receiver wants to watch specific television program, can be tuning fast.
Fig. 8 is the service location descriptor that the present invention only uses TVCT, judges the schematic diagram of the example of stream kind.
From the TVCT of Fig. 8 (a), a clock memory two channels (11-1,11-2).And, if the service location descriptor of 11-1 channel is analyzed, from Fig. 8 (b) we as can be seen, there are 3 streams in it.And, according to the thresholding of stream type, can judge that first stream is video, second stream, the 3rd stream are audio frequency.At this moment, the language of audio stream value all is korean.Therefore, in existing PSIP specification, in this case, only, can distinguish two audio streams by TVCT.That is, behind the reception PAT/PMT,, can distinguish two audio frequency in the channel by analyzing component name descriptor.
But, in the present invention, as shown in Figure 8,, just can distinguish two audio frequency in the channel by receiving only TVCT.That is, if the component name string of analysis chart 7 just can distinguish the stream with same stream type, language.
Therefore, the present invention after showing related content on the picture, can notify the user to have a plurality of audio frequency by audio/video PID at once.
Fig. 9 is the skeleton diagram that flows the digital TV receiving system of differentiation among the present invention.
In Fig. 9, the RF signal of 110 tuning specific channels of tuner is with TP (Transportstream: transport stream) after the form detection, to 120 outputs of TP multiple signals separated part.Above-mentioned TP multiple signals separated part 120 is utilized the PID of multiplexed TP, after separating audio and video and PSIP, the PSI information, exports to decoder 130,140,150,160 separately respectively.Then, above-mentioned TP multiple signals separated part 120 receives audio/video PID from PSIP decoder 150 and selects signal, separating audio and video bit stream.
The audio bitstream of 130 pairs of inputs of above-mentioned audio decoder is suitable for the audio decoder algorithm of having set, is recovered to original audio signal; The video bit stream of 140 pairs of inputs of Video Decoder is suitable for the video decode algorithm of having set, is recovered to original vision signal.Above-mentioned PSIP decoder is analyzed each table from the PSIP information of input, decode.At this moment, when differentiating the kind time-like that transmits stream, as shown in Figure 8, can distinguish a plurality of streams that in a channel, transmit only with reference to the service locationdescriptor in the TVCT.
Common digital TV receiver in order as early as possible the content of tuning channel to be offered the user, need receive TVCT at first behind channel tuning.Reason is, the tuning back of digital TV is to seeing that the time ratio simulated television that picture spends grows several times.
By utilizing service location descriptor of the present invention, the user can select the audio frequency of wishing apace.That is,, do not need to wait for that PAT/PMT receives,, in the shortest time, can receive user's selection owing to, can distinguish the audio stream that in a channel, transmits only by TVCT in order to carry out audio selection.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (6)
1, a kind of transmission stream method of discrimination is the virtual channel table that utilizes in the table that belongs to program and system information protocol, judges the method for the kind of the stream that transmits in a channel, and it comprises:
Insert and transmit the information whether supplemental instruction of stream type, elementary_PID, language message and the described stream of expression of broadcast program exists in the service location descriptor in VCT together; And show that in described information supplemental instruction about stream when existing, inserts and transmit the annotated transfer phase of described stream together;
According to the information whether supplemental instruction of representing described stream exists, utilize the stream type, language message and the supplemental instruction that are included in the above-mentioned VCT about flowing, distinguish the reception stage of the kind of the stream that in a channel, transmits.
2, transmission stream method of discrimination as claimed in claim 1 is characterized in that:
Above-mentioned transfer phase is exactly to distribute the position of not using the territory by information bit, and whether expression exists about the supplemental instruction of stream
3, transmission stream method of discrimination as claimed in claim 1 is characterized in that:
If the above-mentioned reception stage is exactly above-mentioned information indication existence supplemental instruction about flowing in service location descriptor, then utilize stream type, language message and supplemental instruction in above-mentioned service location descriptor, distinguish the kind of the stream that in a channel, transmits about flowing
4, transmission stream method of discrimination as claimed in claim 1 is characterized in that:
If being exactly above-mentioned information, the above-mentioned reception stage indicates the supplemental instruction that in service location descriptor, does not exist about stream, then only utilize stream type, language message in the above-mentioned service location descriptor, distinguish the kind of the stream that in a channel, transmits.
5, transmission stream method of discrimination as claimed in claim 1 is characterized in that:
The supplemental instruction of above-mentioned stream has the form of the many string structures that define in PSIP.
6, transmission stream method of discrimination as claimed in claim 3 is characterized in that:
Above-mentioned transfer phase is exactly to distribute the position of not using the territory by information bit, and whether expression exists about the supplemental instruction of stream.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305309A (en) * | 1999-10-08 | 2001-07-25 | Lg电子株式会社 | Virtual frequency channel table of broadcast protocol and method of broadcasting and receiving said broadcasting using said protocol |
| KR20040017592A (en) * | 2002-08-22 | 2004-02-27 | 가온미디어 주식회사 | The channel information providing method of digital terrestrial receiver |
| US20040225846A1 (en) * | 2000-06-05 | 2004-11-11 | Zicheng Guo | Method and system for scheduled activation of system information tables in digital transport streams |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305309A (en) * | 1999-10-08 | 2001-07-25 | Lg电子株式会社 | Virtual frequency channel table of broadcast protocol and method of broadcasting and receiving said broadcasting using said protocol |
| US20040225846A1 (en) * | 2000-06-05 | 2004-11-11 | Zicheng Guo | Method and system for scheduled activation of system information tables in digital transport streams |
| KR20040017592A (en) * | 2002-08-22 | 2004-02-27 | 가온미디어 주식회사 | The channel information providing method of digital terrestrial receiver |
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