CN103313125B - Two-way digital television signal seamless handover method and system based on transmission stream - Google Patents
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Abstract
The present invention provides a kind of two-way digital television signal seamless handover method based on transmission stream and system, and the method includes: obtain the two-way transmission flow data of identical coded system and same program content；Two-way transmitting flow data and disassembles into the multiple TS bags being unit with the byte of preset number respectively, each TS bag includes at least one PES bag；The pid value that coding side according to PES bag indicates, reads the DTS frame information in each PES bag, using the DTS frame information relative reference time tag as bitstreams switching；Two-way is transmitted buffer memory after flow data aligns with time tag for benchmark；The TS bag captured respectively in every road transmission flow data carries out the statistics that continuous counter is wrong, is exported as main road by less for a mistake road transmission flow data, and the transmission flow data of another road identical time is then given up or standby.The present invention is a kind of bitstreams switching technology based on transmission stream Primary layer, it is achieved that the seamless switching in objective sense, has effectively evaded channel and reception time delay error that modulation system difference is brought.
Description
Technical field
The invention belongs to signal handoff technique field, relate to a kind of digital television signal changing method, particularly relate to a kind of two-way digital television signal seamless handover method based on transmission stream and system.
Background technology
For simulated television, it is typically in field blanking interval and completes the switching of two paths of signals, and for DTV, due to signal fully digitalization, and image and sound have both passed through compressed encoding, and compression is both needed to meet different standard regulations, it is difficulty with the digital television signal seamless switching at program layer.Simple understanding for seamless switching is exactly that the stream after switching is no matter from subjective sensation or in objective data, all without the vestige of splicing, just as original video/audio is carried out complete cataloged procedure.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of two-way digital television signal seamless handover method based on transmission stream and system, for the problem solving to be difficulty with the seamless switching of program layer digital TV signal in prior art.
For achieving the above object and other relevant purposes, the present invention provides a kind of two-way digital television signal seamless handover method based on transmission stream and system.
A kind of two-way digital television signal seamless handover method based on transmission stream, the described two-way digital television signal seamless handover method based on transmission stream includes:
Obtain the two-way transmission flow data of identical coded system and same program content, be called first via transmission flow data and the second tunnel transmission flow data；
Two-way transmitting flow data and disassembles into the multiple TS bags being unit with the byte of preset number respectively, each TS bag includes at least one PES bag；
The pid value that coding side according to PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching；
The described first via is transmitted flow data and buffer memory after flow data aligns for benchmark with time tag is transmitted on the second tunnel；
The TS bag captured respectively in every road transmission flow data carries out the statistics that continuous counter is wrong, is exported as main road by less for a mistake road transmission flow data, and the transmission flow data of another road identical time is then given up or standby.
Preferably, in described unit, the number of byte is 188.
Preferably, the process that described continuous counter is wrong is: utilize the TS bag that accumulative algorithm captures in every road transmission flow data to carry out continuous counter Wrong Shipment calculation.
Preferably, the two paths of signals that the two-way transmission flow data of described identical coded system and same program content comes from different channels, there is different delay, launches after different modulating.
Preferably, described two paths of signals Zhong mono-road signal is satellite-signal, and another road signal is ground signal.
Preferably, the coding side of described PES bag includes the program clock reference parameter PCR rebuild for decoding end system clock, the Decoding Time Stamp DTS when the data stream carrying predefined label being decoded for regulation decoding end, the Presentation Time Stamp PTS that when displayed by the data stream carrying predefined label for regulation decoding end.
Preferably, the process that implements that described first via transmission flow data and the second tunnel transmission flow data align with time tag for benchmark is included: utilize maximum Similarity matching method that the described first via is transmitted flow data and the second tunnel transmission flow data carries out DTS frame information coupling.
Preferably, the detailed process carrying out DTS frame information coupling described in includes:
Judge in described two paths of signals, whether each road signal locks；If locked, Ze Duigai road signal carries out TS demultiplexing；Otherwise rejudge whether this road signal locks；
Signal after TS is demultiplexed carries out basis frame-grab, it may be judged whether capture basis frame；If so, frame coupling is then carried out；Otherwise, recapture basis frame；
Judge whether to capture frame coupling；If so, space signal whether losing lock is then judged；Otherwise, frame coupling is re-started；
If the non-losing lock of space signal, then judging primary signal whether losing lock, if then switching, otherwise rejudging space signal whether losing lock；
If space signal is losing lock, then judging described two paths of signals Zhong mono-road signal whether losing lock, if then relocking this road signal, then locking another road signal in described two paths of signals if not.
A kind of two-way digital television signal seamless switch-over system based on transmission stream, described system includes: first antenna, second antenna, the first demodulation module, the second demodulation module, first decoder module, second decoder module, memory module, continuous counter mistake statistical module, code stream selection module, code stream output module；Described first antenna receives first via bit stream data；Described second antenna receives the second road bit stream data that coded system is identical and programme content is also identical transmitting flow data with the described first via；Described first demodulation module is connected with described first antenna, and described first via bit stream data is demodulated to a TS stream；Described second demodulation module is connected with described second antenna, and described second road bit stream data is demodulated to the 2nd TS stream；Described first decoder module is connected with described first demodulation module, resolves a described TS stream, finds out the basic frame of a TS stream；Described second decoder module is connected with described second demodulation module, resolves described 2nd TS stream, finds out the basic frame of the 2nd TS stream；Described memory module is respectively connected with described first decoder module and the second decoder module, buffer memory after a described TS stream and the 2nd TS stream being alignd with basis frame for benchmark；Described continuous counter mistake statistical module is connected with described memory module, and the TS stream after buffer memory after alignment and the 2nd TS stream are carried out continuous counter mistake statistics；Described code stream selection module is connected with described continuous counter mistake statistical module, and using less for a mistake road TS stream as main road code stream, the TS stream of another road identical time is then given up or standby；Described code stream output module is connected with described code stream selection module, exports described main road code stream.
Preferably, described first decoder module includes: a TS encapsulation unit, a DTS frame acquiring unit；A described TS encapsulation unit is connected with described first demodulation module, and a described TS stream is disassembled into the multiple TS bags being unit with the byte of preset number；Each TS bag includes at least one PES bag；A described DTS frame acquiring unit is connected with a described TS encapsulation unit, according to the pid value that the coding side of PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching.
Preferably, described second decoder module includes: the 2nd TS encapsulation unit, the 2nd DTS frame acquiring unit；Described 2nd TS encapsulation unit is connected with described second demodulation module, and described 2nd TS stream is disassembled into the multiple TS bags being unit with the byte of preset number；Each TS bag includes at least one PES bag；Described 2nd DTS frame acquiring unit is connected with described 2nd TS encapsulation unit, according to the pid value that the coding side of PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching.
As it has been described above, the two-way digital television signal seamless handover method based on transmission stream of the present invention and system, have the advantages that
Two-way digital television signal seamless handover method based on transmission stream of the present invention is a kind of bitstreams switching technology based on transmission stream Primary layer, the seamless switching in objective sense can be accomplished, effectively evade channel and reception time delay error that modulation system difference is brought, it is possible to be applied to the several scenes such as front end emission machine room Hot Spare, space diversity reception switching, the wireless integration of three networks.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the two-way digital television signal seamless handover method based on transmission stream of the present invention.
Fig. 2 is the schematic flow sheet carrying out DTS frame information coupling of the present invention.
Fig. 3 is the structural representation of the two-way digital television signal seamless switch-over system based on transmission stream of the present invention.
Fig. 4 is the schematic flow sheet that the losing lock situation according to satellite-signal or ground signal described in the embodiment of the present invention two realizes quickly switching.
Label declaration
110 first antennas
120 second antennas
130 first demodulation modules
140 second demodulation modules
150 first decoder modules
151 the oneth TS encapsulation unit
152 the oneth DTS frame acquiring units
160 second decoder modules
161 the 2nd TS encapsulation unit
162 the 2nd DTS frame acquiring units
170 memory modules
180 continuous counter mistake statistical modules
190 code stream selection modules
200 code stream output modules
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art the content disclosed by this specification can understand other advantages and effect of the present invention easily.The present invention can also be carried out by additionally different detailed description of the invention or apply, and the every details in this specification based on different viewpoints and application, can also carry out various modification or change under the spirit without departing from the present invention.
Refer to accompanying drawing.It should be noted that, the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way, then assembly that in graphic, only display is relevant with the present invention but not component count when implementing according to reality, shape and size drafting, during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout kenel is likely to increasingly complex.
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
Embodiment one
The present embodiment provides a kind of two-way digital television signal seamless handover method based on transmission stream, as it is shown in figure 1, the described two-way digital television signal seamless handover method based on transmission stream includes:
Obtain the two-way transmission flow data of identical coded system and same program content, be called first via transmission flow data and the second tunnel transmission flow data.Further, the two paths of signals that the two-way transmission flow data of described identical coded system and same program content comes from different channels, there is different delay, launches after different modulating；Namely the two paths of signals that coded system is identical and programme content is identical that first via transmission flow data and the second tunnel transmission flow data come from different channels, there is different delay, launch after different modulating.Further, described two paths of signals Zhong mono-road signal can be satellite-signal, and another road signal can be ground signal.
Two-way transmitting flow data (be equivalent to TS stream) and disassembles into the multiple TS bags being unit with the byte of preset number respectively, each TS bag includes at least one PES bag；Wherein, in described unit, the number of byte is 188, and a series of TS bags constitute TS stream.TS bag is combined by one or more PES bags, and PES bag is a PES Packet Elementary Stream, is not basis frame.Specifically, the coding side of described PES bag includes the program clock reference parameter PCR, the Decoding Time Stamp DTS when the data stream carrying predefined label being decoded for regulation decoding end and the Presentation Time Stamp PTS when displayed by the data stream carrying predefined label for regulation decoding end that rebuild for decoding end system clock.When decoding, TS Traffic Decomposition can be become PES bag one by one by demultiplexer, and then PES bag can be splitted into the ES stream of video and audio frequency by bale breaker, and the ES stream (elementarystream, substantially stream) of final video and audio frequency can be decoded by input decoder.The decoding of TS stream is divided into two steps: the first step, from PID(packetidentifier, PID Packet Identifier) be 0 TS bag in, parse PAT(programassociationtable, Program Association Table), then from pat table, find the PID of each program source, this type of program source general is all made up of several ES streams, and describes in pmt table, then passes through the PID of program source, just can at PMT(programmappingtable, program map table) the exterior and the interior retrieves the PID of each ES stream.Second step, the bag (i.e. TS bag) on TS stream, according to the PID flowed of the ES in pmt table, is made a distinction, and is decoded by different ES stream by decoder.So, TS stream completes through program multiplexing and transmission multiplexing two-layer, namely when program multiplexing, adds PMT, when transmitting multiplexing, adds PAT.
The pid value that coding side according to PES bag indicates, reads the DTS(decodingtimestamp in each PES bag, solution intersymbol labelling) frame information, and using the described DTS frame information relative reference time tag as bitstreams switching.
The described first via being transmitted flow data and buffer memory after flow data aligns for benchmark with time tag is transmitted on the second tunnel, namely foundation processes relief area.Further, the process that implements that described first via transmission flow data and the second tunnel transmission flow data align with time tag for benchmark is included: utilize maximum Similarity matching method that the described first via is transmitted flow data and the second tunnel transmission flow data carries out DTS frame information coupling.
Specifically, the detailed process of DTS frame (Decoding Time Stamp, is packetized in inside the frame head of PES bag together with PTS, not very basis frame, simply the concept of position information) information matches is carried out described in as in figure 2 it is shown, include:
Judge in described two paths of signals, whether each road signal locks；If locked, Ze Duigai road signal carries out TS demultiplexing；Otherwise rejudge whether this road signal locks；
Signal after TS is demultiplexed carries out basis frame-grab, it may be judged whether capture basis frame；If so, frame coupling is then carried out；Otherwise, recapture basis frame；
Judge whether to capture frame coupling；If so, space signal whether losing lock is then judged；Otherwise, frame coupling is re-started；
If the non-losing lock of space signal, then judging primary signal whether losing lock, if then switching, otherwise rejudging space signal whether losing lock；
If space signal is losing lock, then judging described two paths of signals Zhong mono-road signal whether losing lock, if then relocking this road signal, then locking another road signal in described two paths of signals if not.
The TS bag captured respectively in every road transmission flow data carries out the statistics that continuous counter is wrong, is exported as main road by less for a mistake road transmission flow data, and the transmission flow data of another road identical time is then given up or standby；This step is by the more hundreds of frame data of batch, select the wrong less frame of continuous counter as switching foundation, along with the continuous change of received signal quality, and complete variable interval, quick, seamless mutual handoff technique, make the subjective view reception effect finally presented can not with the naked eye identify handoff procedure.Whole handoff procedure it is crucial that two-way to be transmitted the selection of flow data sync mark, the accurate control of time reference, and the formulation of switchover policy.
Or selecting the road signal (or transmitting data stream) relatively early arriving receiver to play as main road output, another road signal (or transmitting data stream) is then as standby road.
Further, the process that described continuous counter is wrong is: utilize the TS bag that accumulative algorithm captures in every road transmission flow data to carry out continuous counter Wrong Shipment calculation.
The present embodiment also provides for a kind of two-way digital television signal seamless switch-over system based on transmission stream, this switched system can realize changing method of the present invention, but the device that realizes of changing method of the present invention includes but not limited to the switched system described in the present embodiment.As shown in Figure 3, described switched system includes: first antenna 110, second antenna 120, the first demodulation module 130, the second demodulation module 140, first decoder module 150, second decoder module 160, memory module 170, continuous counter mistake statistical module 180, code stream selection module 190, code stream output module 200.
Described first antenna 110 receives first via bit stream data.
Described second antenna 120 receives the second road bit stream data that coded system is identical and programme content is also identical transmitting flow data with the described first via；The two paths of signals that described first via bit stream data and the second road bit stream data come from different channels, there is different delay, launch after different modulating.
Described first demodulation module 130 is connected with described first antenna 110, and described first via bit stream data is demodulated to a TS stream；
Described second demodulation module 140 is connected with described second antenna 120, and described second road bit stream data is demodulated to the 2nd TS stream；
Described first decoder module 150 is connected with described first demodulation module 130, resolves a described TS stream, finds out the basic frame of a TS stream；Further, described first decoder module 150 includes: a TS encapsulation unit 151, a DTS frame acquiring unit 152；A described TS encapsulation unit 151 is connected with described first demodulation module 130, and a described TS stream is disassembled into the multiple TS bags being unit with the byte of preset number；Wherein, in described unit, the number of byte is 188；Each TS bag includes at least one PES bag；A described DTS frame acquiring unit 152 is connected with a described TS encapsulation unit 151, according to the pid value that the coding side of PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching.
Described second decoder module 160 is connected with described second demodulation module 140, resolves described 2nd TS stream, finds out the basic frame of the 2nd TS stream；Further, described second decoder module 160 includes: the 2nd TS encapsulation unit 161, the 2nd DTS frame acquiring unit 162；Described 2nd TS encapsulation unit 161 is connected with described second demodulation module 140, and described 2nd TS stream is disassembled into the multiple TS bags being unit with the byte of preset number；Wherein, in described unit, the number of byte is 188；Each TS bag includes at least one PES bag；Described 2nd DTS frame acquiring unit 162 is connected with described 2nd TS encapsulation unit 161, according to the pid value that the coding side of PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching.
Described memory module 170 is respectively connected with described first decoder module 150 and the second decoder module 160, buffer memory after a described TS stream and the 2nd TS stream being alignd with basis frame for benchmark；
Described continuous counter mistake statistical module 180 is connected with described memory module 170, and the TS stream after buffer memory after alignment and the 2nd TS stream are carried out continuous counter mistake statistics；
Described code stream selection module 190 is connected with described continuous counter mistake statistical module 180, and using less for a mistake road TS stream as main road code stream, the TS stream of another road identical time is then given up or standby；
Described code stream output module 200 is connected with described code stream selection module 190, exports described main road code stream.
nullThe present invention mainly uses corresponding demodulation module，Realize the unsuccessful demodulation of two-way code stream respectively，Obtain two-way transmission stream (TS) data of identical coded system and same program content，TS completes through program multiplexing and transmission multiplexing two-layer，In order to ensure the efficiency of switching，Arbitrary road code stream is not decoded，Only each road code stream is disassembled into the multiple TS bags being unit with 188 bytes，Each TS bag is made up of one or more PES bags，The pid value that coding side according to PES bag indicates，Read the relative reference time tag as bitstreams switching of the DTS frame information in each PES bag，Set up the data flow cache space of certain capacity，Input-buffer after two-way code stream is alignd with time tag for benchmark，Capture hundreds of TS bags with accumulative algorithm simultaneously and carry out the statistics that continuous counter is wrong，Less for a mistake road code stream is exported as main road，The code stream of another road identical time is then as standby or give up.Such two-way signal bit stream just achieves synchronization and output switching at transmission stream Primary layer, it is achieved that seamless switching truly.
Embodiment two
The present embodiment switches to example that the two-way digital television signal seamless handover method based on transmission stream of the present invention is described in detail with satellite-signal and ground signal.Owing to ground information source is to the result of remodulates after satellite-signal demodulation demultiplexing, thus there is the time delay of more than 1s, and test difference is not fixed.And satellite-signal is to send into reception system by special satellite mobile receiver aerial, receiving system Satellite demodulation module and satellite RF signal is demodulated to TS stream, send into buffer memory, it is contemplated that the undulatory property of time delay, buffer area is arranged on more than 10s as far as possible.Utilize decoding chip according to the information resolving corresponding TS stream, after finding out basis frame, the basic frame after demultiplexing and the TS bag after this basis frame are sent into SDRAM(buffer memory).In like manner, the basic frame of ground signal, after same operation, is also sent into SDRAM by ground signal.Based on cause, frame all can add three parameters for synchronizing at the coding side of self, be PCR, DTS and PTS respectively, and wherein PCR is program clock reference, and the system clock for decoding end is rebuild；DTS is Decoding Time Stamp, for when the data stream carrying this label is decoded by regulation decoding end；PTS is Presentation Time Stamp, for when the data stream carrying this label is displayed by regulation decoding end；Although three labels are time labelling, but there is certain precision and efficiency variance, the present invention uses the DTS of full accuracy and peak efficiency as alignment benchmark.Owing to identical basic frame satellite-signal always first arrives receiver than ground signal, therefore can search the basic frame of satellite-signal in ground signal, complete frame coupling and synchronize.It is pointed out that owing to terrestrial channel would be likely to occur error code, therefore maximum Similarity matching method can be used when frame matching ratio pair.The TS stream completing to synchronize can according to the losing lock situation of satellite-signal or ground signal, it is achieved quickly switching, concrete switching flow is referring to Fig. 4.
Two-way digital television signal seamless handover method based on transmission stream of the present invention is a kind of bitstreams switching technology based on transmission stream Primary layer, the seamless switching in objective sense can be accomplished, effectively evade channel and reception time delay error that modulation system difference is brought, it is possible to be applied to the several scenes such as front end emission machine room Hot Spare, space diversity reception switching, the wireless integration of three networks.
In sum, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment is illustrative principles of the invention and effect thereof only, not for the restriction present invention.Above-described embodiment all under the spirit and category of the present invention, can be modified or change by any those skilled in the art.Therefore, art has usually intellectual such as modifying without departing from all equivalences completed under disclosed spirit and technological thought or change, must be contained by the claim of the present invention.
Claims (11)
1. the two-way digital television signal seamless handover method based on transmission stream, it is characterised in that the described two-way digital television signal seamless handover method based on transmission stream includes:
Obtain the two-way transmission flow data of identical coded system and same program content, be called first via transmission flow data and the second tunnel transmission flow data；
Two-way transmitting flow data and disassembles into the multiple TS bags being unit with the byte of preset number respectively, each TS bag includes at least one PES bag；
The pid value that coding side according to PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching；
The described first via is transmitted flow data and buffer memory after flow data aligns for benchmark with time tag is transmitted on the second tunnel；
The TS bag captured respectively in every road transmission flow data carries out the statistics that continuous counter is wrong, is exported as main road by less for a mistake road transmission flow data, and the transmission flow data of another road identical time is then given up or standby.
2. the two-way digital television signal seamless handover method based on transmission stream according to claim 1, it is characterised in that: in described unit, the number of byte is 188.
3. the two-way digital television signal seamless handover method based on transmission stream according to claim 1, it is characterised in that the process of described continuous counter mistake is: utilize the TS bag that accumulative algorithm captures in every road transmission flow data to carry out continuous counter Wrong Shipment calculation.
4. the two-way digital television signal seamless handover method based on transmission stream according to claim 1, it is characterised in that: the two paths of signals that the two-way transmission flow data of described identical coded system and same program content comes from different channels, there is different delay, launches after different modulating.
5. the two-way digital television signal seamless handover method based on transmission stream according to claim 4, it is characterised in that: described two paths of signals Zhong mono-road signal is satellite-signal, and another road signal is ground signal.
6. the two-way digital television signal seamless handover method based on transmission stream according to claim 1, it is characterised in that: the coding side of described PES bag includes the program clock reference parameter PCR for the reconstruction of decoding end system clock, the Decoding Time Stamp DTS when the data stream carrying predefined label being decoded for regulation decoding end, the Presentation Time Stamp PTS that when displayed by the data stream carrying predefined label for regulation decoding end.
7. the two-way digital television signal seamless handover method based on transmission stream according to claim 4, it is characterized in that, the process that implements that described first via transmission flow data and the second tunnel transmission flow data align for benchmark with time tag is included: utilize maximum Similarity matching method that the described first via is transmitted flow data and the second tunnel transmission flow data carries out DTS frame information coupling.
8. the two-way digital television signal seamless handover method based on transmission stream according to claim 7, it is characterised in that described in carry out the detailed process of DTS frame information coupling and include:
Judge in described two paths of signals, whether each road signal locks；If locked, Ze Duigai road signal carries out TS demultiplexing；Otherwise rejudge whether this road signal locks；
Signal after TS is demultiplexed carries out basis frame-grab, it may be judged whether capture basis frame；If so, frame coupling is then carried out；Otherwise, recapture basis frame；
Judge whether to capture frame coupling；If so, space signal whether losing lock is then judged；Otherwise, frame coupling is re-started；
If the non-losing lock of space signal, then judging primary signal whether losing lock, if then switching, otherwise rejudging space signal whether losing lock；
If space signal is losing lock, then judging described two paths of signals Zhong mono-road signal whether losing lock, if then relocking this road signal, then locking another road signal in described two paths of signals if not.
9. the two-way digital television signal seamless switch-over system based on transmission stream, it is characterised in that the described two-way digital television signal seamless switch-over system based on transmission stream includes:
First antenna, receives first via bit stream data；
Second antenna, receives identical with the coded system of described first via bit stream data and that programme content is also identical the second road bit stream data；
First demodulation module, is connected with described first antenna, and described first via bit stream data is demodulated to a TS stream；
Second demodulation module, is connected with described second antenna, and described second road bit stream data is demodulated to the 2nd TS stream；
First decoder module, is connected with described first demodulation module, resolves a described TS stream, finds out the basic frame of a TS stream；
Second decoder module, is connected with described second demodulation module, resolves described 2nd TS stream, finds out the basic frame of the 2nd TS stream；
Memory module, is respectively connected with described first decoder module and the second decoder module, buffer memory after a described TS stream and the 2nd TS stream being alignd with basis frame for benchmark；
Continuous counter mistake statistical module, is connected with described memory module, and the TS stream after buffer memory after alignment and the 2nd TS stream are carried out continuous counter mistake statistics；
Code stream selection module, is connected with described continuous counter mistake statistical module, and using less for a mistake road TS stream as main road code stream, the TS stream of another road identical time is then given up or standby；
Code stream output module, is connected with described code stream selection module, exports described main road code stream.
10. the two-way digital television signal seamless switch-over system based on transmission stream according to claim 9, it is characterised in that described first decoder module includes:
Oneth TS encapsulation unit, is connected with described first demodulation module, and a described TS stream is disassembled into the multiple TS bags being unit with the byte of preset number；Each TS bag includes at least one PES bag；
Oneth DTS frame acquiring unit, is connected with a described TS encapsulation unit, according to the pid value that the coding side of PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching.
11. the two-way digital television signal seamless switch-over system based on transmission stream according to claim 9, it is characterised in that described second decoder module includes:
2nd TS encapsulation unit, is connected with described second demodulation module, and described 2nd TS stream is disassembled into the multiple TS bags being unit with the byte of preset number；Each TS bag includes at least one PES bag；
2nd DTS frame acquiring unit, is connected with described 2nd TS encapsulation unit, according to the pid value that the coding side of PES bag indicates, reads the DTS frame information in each PES bag, and using the described DTS frame information relative reference time tag as bitstreams switching.
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