CN102595236A - Set top box and method thereof for changing channels of digital television - Google Patents
Set top box and method thereof for changing channels of digital television Download PDFInfo
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Abstract
The invention discloses a method for changing channels of a digital television, which comprises the following steps: receiving a channel-changing instruction; judging whether a channel-changing target channel is within a preparatory channel-changing group according to the channel-changing instruction; if yes, realizing channel changing by using the PMT (Program Map Table) and ECM (Entitlement Control Message) data of the target channel cached in advance; if not, receiving a PMT of the target channel, opening an audio and video frequency and ECM channel after analysis, receiving the ECM and realizing channel changing; and constructing a preparatory channel-changing group again after channel changing. The invention also discloses a set top box. In such a manner, the method has the beneficial effects that the channel-changing time of the digital television can be shortened, and the user experience can be improved.
Description
Technical field
The present invention relates to the digital television techniques field, particularly relate to the method that a kind of STB and DTV thereof change platform.
Background technology
Present domestic DTV integral translation is accomplished basically, and the televiewer has begun the digital television signal watch programs that is widely used.Compare over the conventional analogue TV signal, digital television signal has view reception effect good, and antijamming capability is strong, can transmit characteristics such as multiple digitalized data value-added service.And DTV utilizes digitalization compressed coding and multiplex technique, can formerly can only transmit on the frequency of an analog channel and transmit the digital channel of 4～10 covers, greatly enriched television channel quantity.Cover surplus the digital channel that has now broadcasted has reached 200, but a problem also brought thereupon, all the time; The television program receiving spectators have a custom; Like forward or backward according to the rendition list order switching channels fast, maybe programs of interest or just to whiling away the time to search, and now because the increase of digital channel quantity; It is obviously elongated that all channels are switched cycle of taking turns, waste user's plenty of time.
The principle that the prior art DTV switches program does; Digital television system comprises one the tunnel or multi-channel tv programs data and some additional information on services (Service information; SI) data etc.; Comprise one or more audio frequency and video elementary stream (Elementary Streams, ES) data in each TV programme.These data multiplexs (MUX) divide into groups to be packaged into different MPTSs (Transport Stream TS) divides into groups, with unique this type of data of 13bits numeral flag of system, promptly wrap identifier (Packet identification, PID).Receive MPTS behind the STB demodulation module frequency locking, at first analyze the SI data then, again to the data in the TS stream; Carry out demultiplexing (DEMUX) according to PID, obtain ES stream and then carry out decodes and plays, if scrambled program; Also need extra reception Entitlement Control Message (Entitlement Control Message; ECM), after obtaining descrambled control words (CW) behind the intelligent card in processing ECM and sending into the descrambling passage of set top box decodes chip, audio frequency and video could normally be broadcasted.Now the main flow demultiplexing decoding chip that uses of single-definition digital television STB can provide very strong demultiplexing multichannel disposal ability, just supports 48 PID passages to be used for Synchronous Processing audio frequency and video and packet such as STi5105.
Explain that through embodiment the prior art DTV switches the method for program below, suppose to change platform to the B channel that the common platform flow process of changing is from the A channel; Close audio frequency and video and the descrambling passage and the ECM receive path of A channel earlier and stop Conditional Access (CA) descrambling, if A and B different frequent points, STB will lock B channel place frequency earlier; Program receiving contingency table (Program Association Table afterwards; PAT), find Program Map Table (Program Map Table, PMT PID PMT) of B channel; Receive that the PMT post analysis obtains the audio frequency and video PID and the ECM PID of B channel and starts the CA descrambling; Open audio/video decoding and the descrambling passage and the ECM receive path of decoding chip subsequently, still can't see audio/video program this moment, receive ECM and by intelligent card in processing after obtain CW; Could normally show audio/video program after sending into the descrambling passage of decoding chip, accomplish and once change platform.This shows that the fastest platform situation of changing is that A and B do not have scrambling with frequency and B channel, the slowest platform situation of changing is that A and B are without frequency and the scrambling of B channel.
Though DTV STB has generally used the self-defined classification of user's favor program now; Front end is broadcast method such as program classification and is helped that the user selects, searches, switching channels; But change PMT and ECM receive path that platform all will be closed previous channel earlier at every turn; Open the PMT and the ECM receive path of target channel again, have only by the time ECM to receive to give to accomplish after the CA resume module and change platform.Like this when the user be very low in the efficient when the rendition list order fast channel switching forward or backward, influence user watched experience.
Summary of the invention
The technical problem that the present invention mainly solves provides the method that a kind of STB and DTV thereof change platform, can shorten the time that DTV changes platform, improves user experience.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the method that provides a kind of DTV to change platform, and this method comprises: receive and change the platform instruction; Judge and change the platform target channel whether in the platform group is changed in preparation according to changing platform instruction; If be judged as be, then use the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance, realize changing platform; If be judged as not, then the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receives ECM, realizes changing platform; After platform is changed in realization, rebuild preparation and change the platform group.
Wherein, rebuilding preparation comprises after changing the step of platform group: PMT and the ECM passage of opening the channel that the preparation that rebuilds changes the platform group; All PMT and the ECM data of the channel of platform group are changed in the preparation that buffer memory rebuilds.
Wherein, reception comprises after changing platform instruction step: close the audio frequency and video passage of current channel, the PMT of current channel and ECM passage stay open.
Wherein, reception comprises before changing platform instruction step: make up preparation and change the platform group;
The construction step that the platform group is changed in preparation comprises: calculate the upper limit that the platform group is changed in preparation; If the demultiplexing chip is except that the shared passage of normal open wireless tunnel and current channel, X vacant passage of residue, and need Y passage to do as if each channel to change platform in advance; M=X/Y then, M change the upper limit of platform group for preparation; Wherein, when the channel quantity of a certain frequency is N, if M is more than or equal to (N-1), except in progress channel, other all channels constitute preparation and change the platform group on the then current frequency; If M is less than (N-1), except in progress channel, (N-1) the platform group is changed in M the channel formation preparation in the individual channel on the then current frequency; Wherein, X, Y, M and N are positive integer; Calculate that preparation changes the platform group, if current channel is i channel Oi, wherein i belongs to 1 to N, and the direction of at first once changing platform before the record promptly is initial point with i, and it is the direction that reduces along i or along the direction of i increase that record changes the platform direction; Begin to calculate from channel Oi then to changing the platform direction, if arrive the border of frequency, promptly 1 or N, also be not accumulated to preparation and change the upper limit M of platform group, then calculate that along changing platform direction in the opposite direction channel number up to accumulative total reaches M, accomplish preparation and changes the structure of platform group; Or begin to calculate to changing the platform direction from channel Oi, do not run into the border of frequency but the accumulative total channel number has reached M, accomplish preparation and changes the structure of platform group.
Wherein, structure comprises after preparing the step of changing the platform group: open PMT and ECM passage that the channel of platform group is changed in preparation; All PMT and ECM data that the channel of platform group is changed in the buffer memory preparation.
Wherein, receiving the step of changing the platform instruction comprises afterwards: the platform target channel is changed in judgement and whether current channel is same frequency; If be judged as not, then directly close the demultiplexing chip channel that the platform group is changed in preparation, change platform after target channel, the platform group is changed in the reconstruct preparation.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of STB is provided, and this STB comprises: receiver module is used for reception and changes the platform instruction; First judge module is used for judging and changing the platform target channel whether in the platform group is changed in preparation according to changing platform instruction; First changes the platform module, is used in the judged result of first judge module using the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance when being, realizes changing platform; Second changes the platform module, is used in the judged result of first judge module for not the time, and the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receive ECM, and platform is changed in realization; Reconstructed module after being used for realizing changing platform, rebuilds preparation and changes the platform group.
Wherein, STB also comprises: first opens module, after being used for reconstructed module and rebuilding preparation and change the platform group, opens the PMT and the ECM passage of the channel that the preparation that rebuilds changes the platform group; First cache module is used for all PMT and ECM data that the channel of platform group is changed in preparation that buffer memory rebuilds.
Wherein, STB also comprises: closing module, be used for receiver module receive change the platform instruction after, close the audio frequency and video passage of current channel, the PMT of current channel and ECM passage stay open.
Wherein, STB also comprises: make up module, be used for making up preparation and change the platform group, change the platform instruction with reception and change platform;
Making up module specifically is used for: calculate the upper limit that the platform group is changed in preparation; If the demultiplexing chip is except that the shared passage of normal open wireless tunnel and current channel, X vacant passage of residue, and need Y passage to do as if each channel to change platform in advance; M=X/Y then, M change the upper limit of platform group for preparation; Wherein, when the channel quantity of a certain frequency is N, if M is more than or equal to (N-1), except in progress channel, other all channels constitute preparation and change the platform group on the then current frequency; If M is less than (N-1), except in progress channel, (N-1) the platform group is changed in M the channel formation preparation in the individual channel on the then current frequency; Wherein, X, Y, M and N are positive integer; Calculate that preparation changes the platform group, if current channel is i channel Oi, wherein i belongs to 1 to N, and the direction of at first once changing platform before the record promptly is initial point with i, and it is the direction that reduces along i or along the direction of i increase that record changes the platform direction; Begin to calculate from channel Oi then to changing the platform direction, if arrive the border of frequency, promptly 1 or N, also be not accumulated to preparation and change the upper limit M of platform group, then calculate that along changing platform direction in the opposite direction channel number up to accumulative total reaches M, accomplish preparation and changes the structure of platform group; Or begin to calculate to changing the platform direction from channel Oi, do not run into the border of frequency but the accumulative total channel number has reached M, accomplish preparation and changes the structure of platform group.
Wherein, STB also comprises: second opens module, after being used to make up module construction preparation and changing the platform group, opens PMT and ECM passage that the channel of platform group is changed in preparation; Second cache module is used for all PMT and ECM data that the channel of platform group is changed in the buffer memory preparation.
Wherein, STB also comprises: second judge module, be used for receiver module receive change the platform instruction after, judge and change the platform target channel and whether current channel is same frequency; The 3rd changes the platform module, is used in the judged result of second judge module directly closing the demultiplexing chip channel that the platform group is changed in preparation for not the time, changes platform after target channel, and the platform group is changed in the reconstruct preparation.
The invention has the beneficial effects as follows: the situation that is different from prior art; After the present invention receives and to change the platform instruction, judge and change the platform target channel whether in the platform group is changed in preparation, if in the platform group is changed in preparation; Just can use preparation to change platform group the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance; Skip the process that receives PMT and ECM when prior art is changed platform, saved and changed the platform time, realized fast channel switching; If not in the platform group is changed in preparation, then use the existing platform technology of changing, promptly the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receives ECM, realizes changing platform.After platform is changed in realization, need rebuild preparation and change the platform group, with the channel guaranteeing to be about to conversion as much as possible in the platform group is changed in preparation.By the way, the present invention can shorten the time that DTV changes platform, improves user experience.
Description of drawings
Fig. 1 is the schematic flow sheet that DTV of the present invention changes method one embodiment of platform;
Fig. 2 is the schematic flow sheet that DTV of the present invention changes another embodiment of method of platform;
Fig. 3 is the schematic flow sheet that DTV of the present invention changes the another embodiment of method of platform;
Fig. 4 is the structural representation of STB one embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
Fig. 1 is the schematic flow sheet that DTV of the present invention changes method one embodiment of platform, and the practical implementation step is following:
STB receives that the user sends change the platform instruction after, at first close the audio frequency and video passage of current channel, but the PMT and the ECM passage of current channel stayed open.Wherein, the passage that each digital channel uses is approximately 4, comprises 1 PMT, 1 road video, 1 road audio frequency, 1 ECM.
Change platform in the prior art at every turn and all will close the PMT and the ECM receive path of current channel earlier, open the PMT and the ECM receive path of target channel again, have only by the time ECM to receive to give to accomplish after the CA resume module and change platform.Like this when the user be very low in the efficient when the rendition list order fast channel switching forward or backward.
Whole changing in the platform process; Though frequency locking and CA module are consuming time more to these two parts of processing of ECM, the technical characterstic that receives DTV self can't be avoided, so the present invention make a prediction to a plurality of possibility channels that the user is about to switch; And the platform group is changed in the structure preparation; The platform group is changed in preparation through making up, will belong to the PMT and the ECM data in advance that prepare the channel that changes the platform group and receive also buffer memory, changes platform speed with raising.
Following mask body is introduced the preparation of the present invention's proposition and is changed platform group constructive method and change the platform technology accordingly in advance; Promptly normally change under the prerequisite of platform time in assurance; PMT and the ECM data of platform group are changed in buffer memory preparation as far as possible in advance, and shortening changing the platform time next time changed platform efficient with raising.
At first calculate the upper limit that the platform group is changed in preparation, if the demultiplexing chip is except that the shared passage of normal open wireless tunnel and current channel, X vacant passage of residue, and if each channel needs Y passage to do and changes platform in advance, M=X/Y then, M prepares the upper limit of changing the platform group.Wherein, X and Y are positive integer, and the M value is got its integer part.
Be that example specifies the upper limit that the platform group is changed in the calculating preparation below with STi5105; The STi5105 demodulation multiplexer is supported 48 PID passages, and wherein some passage need often be opened, and comprises PAT, conditional access table (Conditional Access Table; CAT), network information table (Network Information Table; NIT), SDT Service Description Table (Service Description Table, SDT), Event Information Table (Event Information Table, EIT), time and date table (Time Date Table; TDT), Entitlement Management Message (Entitled Manage Message; EMM), add to be the passages of value-added service data, be left and probably be 36 for the passage that audio/video program uses such as reservations such as advertisements.The passage that each digital channel uses is approximately 4; Comprise 1 PMT, 1 road video, 1 road audio frequency, 1 ECM; Remove the current channel of watching; Also surplus 32 vacant passages, and our platform target of changing in advance is advanced processing PMT and ECM, so these 32 vacant passages have the platform ability of changing in advance of handling 16 channels.Certainly should numeral in practical application can be very different according to the difference of the configuration of front end broadcasting system, scrambling or many CA can increase the number of channels that single channel takies with close etc. respectively such as single channel MCVF multichannel voice frequency, audio frequency and video.
There has been preparation to change the upper limit M of platform group, also needed a prediction algorithm to constitute preparation and change the platform group.This algorithm is except receiving the restriction of M; Also receive the restriction of frequency; Because now the overwhelming majority is a single-frequency point STB on the market, thus want when guaranteeing to watch current channel, to change platform in advance, all channels that the platform group is changed in that preparation all must and current viewing channel at same frequency.The channel quantity of supposing a frequency is N; If M is more than or equal to (N-1); That is to say that demodulation multiplexer can provide all channels of current frequency changes the platform ability in advance, on the promptly current frequency except in progress channel all other channels constituted preparation and changed the platform group.If M is less than (N-1), then demodulation multiplexer can only be for except in progress channel, and M channel in remaining (N-1) individual channel provides and change platform in advance.Wherein, N is a positive integer.
Here introduce the system of selection that M channel in the platform group changed in preparation in detail; If current channel is i channel Oi, wherein i belongs to 1 to N, the direction of at first once changing platform before the record; Promptly be initial point with i, the direction that record changes platform is direction that reduces along i or the direction that increases along i.
Begin to calculate from channel Oi then to the platform direction of changing of record; If arrive the border of frequency, promptly 1 or N, also be not accumulated to preparation and change the upper limit M of platform group; Then calculate that along the platform direction in the opposite direction of changing of record the channel number up to accumulative total reaches M, accomplish preparation and change the structure of platform group.Or begin to calculate to the platform direction of changing of record from channel Oi, do not run into the border of frequency but the accumulative total channel number has reached M, accomplish preparation and changes the structure of platform group then equally.
Wherein, to the STB of multiple-tuned ability is arranged, do not had the frequency restriction because the platform group is changed in preparation, only with M as the upper limit, change the platform group according to channel ordering reconstruct preparation and get final product, can utilize the realization of demultiplexing chip multichannel disposal ability to change platform in advance to greatest extent.
Wherein, switch, needn't can shorten the time that DTV changes platform equally according to channel order for the channel that changes in the platform group in preparation.
Therefore, STB receive change platform instruction after, need to judge that the target channel of changing platform whether in the platform group is changed in preparation, to confirm changing platform with prior art, also is to use method of the present invention to change platform.
The target channel of changing platform is if desired then taken out the PMT and the ECM data of buffer memory in advance in the platform group is changed in preparation, skipped the process that receives PMT and ECM when prior art is changed platform, realizes fast channel switching.
The target channel of changing platform is if desired then changed platform through the method for prior art not in the platform group is changed in preparation, promptly the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receives ECM, realizes changing platform.
Above-mentioned situation is target channel and the current channel that need the change platform situation at same frequency; The target channel of changing platform when needs is with current channel during not at identical frequency; Just directly close original preparation and change all passages of platform group, use prior art normally change platform after the target channel again the reconstruct preparation change the platform group and realize changing in advance platform.Therefore, the present invention does not have very big improvement for striding the speed that frequency changes platform.
After platform is changed in realization, be starting point with the channel that changes behind the platform, the method for changing the platform group according to above-mentioned structure preparation rebuilds preparation and changes the platform group.After the completion of platform group structure is changed in preparation; Close and withdraw from PMT and the ECM passage that the channel of platform group is changed in preparation; Open PMT and ECM passage that the channel of platform group is changed in new adding preparation simultaneously, and buffer memory prepares all PMT and the ECM data of changing the platform group, wherein; PMT only upgrades when MPEG section version changes, and ECM only needs a up-to-date section of buffer memory to get final product.
In sum; The present invention proposes one and utilizes the powerful multichannel disposal ability of STB demultiplexing chip to realize the method for changing platform in advance; Promptly utilize demultiplexing chip idle channel to receive PMT and ECM data that the platform group is changed in also buffer memory preparation; Change the platform time with minimizing, and proposed to prepare the constitution principle and the method for changing the platform group.Through the present invention, the situation to user custom is changed platform successively by channel order can obviously shorten the time of changing platform, when physical sequential basically identical in frequency of the logic ordering of channel and its, can bring into play maximum efficiency especially.
Be different from the situation of prior art; After present embodiment receives and to change the platform instruction, judge and change the platform target channel whether in the platform group is changed in preparation, if in the platform group is changed in preparation; Just can use preparation to change platform group the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance; Skip the process that receives PMT and ECM when prior art is changed platform, saved and changed the platform time, realized fast channel switching; If not in the platform group is changed in preparation, then use the existing platform technology of changing, promptly the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receives ECM, realizes changing platform.After platform is changed in realization, need rebuild preparation and change the platform group, with the channel guaranteeing to be about to conversion as much as possible in the platform group is changed in preparation.By the way, the present invention can shorten the time that DTV changes platform, improves user experience.
Fig. 2 is the schematic flow sheet that DTV of the present invention changes another embodiment of method of platform, and is as shown in the figure, and the practical implementation step is following:
Reception need be closed the audio frequency and video passage of current channel, but the PMT of current channel and ECM passage are stayed open after being changed the platform instruction.
Change the platform group for the preparation that rebuilds, appoint PMT and the ECM passage so need open the channel that the preparation that rebuilds changes the platform group, and the preparation that rebuilds of buffer memory all PMT and ECM data of changing the channel of platform group.
Fig. 3 is the schematic flow sheet that DTV of the present invention changes the another embodiment of method of platform, and is as shown in the figure, and the practical implementation step is following:
Step 301 makes up preparation and changes the platform group, to change platform;
Step 302 receives and to change platform instruction back and judge and change the platform target channel and whether current channel is same frequency;
Step 303 if be judged as not, is then directly closed the demultiplexing chip channel that the platform group is changed in preparation, changes platform after target channel, and the platform group is changed in the reconstruct preparation.
If not at same frequency, change platform according to the existing platform technology of changing, change platform after target channel, rebuild preparation according to the frequency at target channel place and change the platform group.
Wherein, If the judged result of step 302 for target channel and the current channel that need change platform at same frequency; So continue target channel that judgement need change platform whether in the platform group is changed in preparation; Ensuing operating among the embodiment shown in Figure 1, existing detailed description is repeated no more at this.
Be different from the situation of prior art; After the present invention receives and to change the platform instruction, judge and change the platform target channel whether in the platform group is changed in preparation, if in the platform group is changed in preparation; Just can use preparation to change platform group the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance; Skip the process that receives PMT and ECM when prior art is changed platform, saved and changed the platform time, realized fast channel switching; If not in the platform group is changed in preparation, then use the existing platform technology of changing, promptly the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receives ECM, realizes changing platform.After platform is changed in realization, need rebuild preparation and change the platform group, with the channel guaranteeing to be about to conversion as much as possible in the platform group is changed in preparation.By the way, the present invention can shorten the time that DTV changes platform, improves user experience.
Fig. 4 is the structural representation of STB one embodiment of the present invention; As shown in the figure, STB comprises: receiver module 41, first judge module 42, first change platform module 43, second and change platform module 44, reconstructed module 45, first and open module 46, first cache module 47, closing module 48, make up module 49, second and open module 50, second cache module 51, second judge module 52 and the 3rd and change platform module 53.
Wherein, receiver module 41 is used for receiving and changes the platform instruction; First judge module 42 is used for judging and changing the platform target channel whether in the platform group is changed in preparation according to changing platform instruction; First changes platform module 43 is used in the judged result of first judge module 42 using the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance when being, realizes changing platform; Second changes platform module 44 is used in the judged result of first judge module 42 for not the time, and the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receive ECM, and platform is changed in realization; Reconstructed module 45 rebuilds preparation and changes the platform group after being used for realizing changing platform; First opens module 46 be used for reconstructed module 45 and rebuild preparation and change the platform group after, open the PMT and the ECM passage of the channel that the preparation that rebuilds changes the platform group; First cache module 47 is used for all PMT and the ECM data that the channel of platform group is changed in preparation that buffer memory rebuilds; Closing module 48 be used for receiver module 41 receive change the platform instruction after, close the audio frequency and video passage of current channel, the PMT of current channel and ECM passage stay open; Structure module 49 is used for making up preparation and changes the platform group, changes the platform instruction with reception and changes platform; Second opens module 50 be used to make up module 49 and make up preparation and change the platform group after, open PMT and ECM passage that the channel of platform group is changed in preparation; Second cache module 51 is used for all PMT and the ECM data that the channel of platform group is changed in the buffer memory preparation; Second judge module 52 be used for receiver module 41 receive change the platform instruction after, judge and change the platform target channel and whether current channel is same frequency; The 3rd changes platform module 53 is used in the judged result of second judge module 52 directly closing the demultiplexing chip channel that the platform group is changed in preparation for not the time, changes platform after target channel, and the platform group is changed in the reconstruct preparation.
Wherein, make up module 49 and specifically be used for: calculate the upper limit that the platform group is changed in preparation, if the demultiplexing chip is except that the shared passage of normal open wireless tunnel and current channel; X vacant passage of residue; And if each channel needs Y passage to do to change platform in advance, M=X/Y then, M is for preparing the upper limit of changing the platform group; Wherein, when the channel quantity of a certain frequency is N, if M is more than or equal to (N-1), except in progress channel, other all channels constitute preparation and change the platform group on the then current frequency; If M is less than (N-1), except in progress channel, (N-1) the platform group is changed in M the channel formation preparation in the individual channel on the then current frequency; Wherein, X, Y, M and N are positive integer; Calculate that preparation changes the platform group, if current channel is i channel Oi, wherein i belongs to 1 to N, and the direction of at first once changing platform before the record promptly is initial point with i, and it is the direction that reduces along i or along the direction of i increase that record changes the platform direction; Begin to calculate from channel Oi then to changing the platform direction, if arrive the border of frequency, promptly 1 or N, also be not accumulated to preparation and change the upper limit M of platform group, then calculate that along changing platform direction in the opposite direction channel number up to accumulative total reaches M, accomplish preparation and changes the structure of platform group; Or begin to calculate to changing the platform direction from channel Oi, do not run into the border of frequency but the accumulative total channel number has reached M, accomplish preparation and changes the structure of platform group.
The work function of each module of STB is following; STB of the present invention is realized changing in the process of platform, before changing platform, at first need make up module 49 structure preparations and change the platform group; Change the platform instruction with reception and change platform; After the platform group was changed in the 49 structure preparations of structure module, second opens module 50 opened PMT and the ECM passage that the channel of platform group is changed in preparation, prepares all PMT and the ECM data of the channel that changes the platform group through second cache module, 51 buffer memorys.
Send the user and to change platform instruction; After receiver module 41 receives and changes the platform instruction; First judge module 42 is judged and is changed the platform target channel whether in the platform group is changed in preparation according to changing the platform instruction; When the judged result of first judge module 42 when being, first changes platform module 43 uses the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance, realizes changing platform; When the judged result of first judge module 42 for not the time, second changes the PMT of platform module 44 receiving target channels, opens audio frequency and video and ECM passage after the analysis, receives ECM, platform is changed in realization.
No matter what mode to realize changing platform through, after realizing changing platform, reconstructed module 45 rebuilds preparation and changes the platform group, with the channel guaranteeing to be about to conversion as much as possible in the platform group is changed in preparation.Reconstructed module 45 rebuild the preparation change the platform group after; First opens PMT and the ECM passage that module 46 is opened the channel that the preparation that rebuilds changes the platform group; All PMT and ECM data that the channel of platform group is changed in the preparation that rebuilds through first cache module, 47 buffer memorys are used when changing platform next time.
Wherein, after the platform instruction was changed in receiver module 41 receptions, closing module 48 need be closed the audio frequency and video passage of current channel, but the PMT of current channel and ECM passage are stayed open.
Simultaneously; After the platform instruction is changed in receiver module 41 receptions; Second judge module 52 also need judge and change the platform target channel and whether current channel is same frequency, if the judged result of second judge module 52 is not for, then the 3rd changes platform module 53 and directly closes the demultiplexing chip channel that the platform group is changed in preparation; Change platform after target channel, the platform group is changed in the reconstruct preparation.
Be different from the situation of prior art; After present embodiment receives and to change the platform instruction, judge and change the platform target channel whether in the platform group is changed in preparation, if in the platform group is changed in preparation; Just can use preparation to change platform group the Program Map Table PMT and the Entitlement Control Message ECM data of the target channel of buffer memory in advance; Skip the process that receives PMT and ECM when prior art is changed platform, saved and changed the platform time, realized fast channel switching; If not in the platform group is changed in preparation, then use the existing platform technology of changing, promptly the PMT of receiving target channel opens audio frequency and video and ECM passage after the analysis, receives ECM, realizes changing platform.After platform is changed in realization, need rebuild preparation and change the platform group, with the channel guaranteeing to be about to conversion as much as possible in the platform group is changed in preparation.By the way, the present invention can shorten the time that DTV changes platform, improves user experience.
The above is merely embodiments of the invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. the method that DTV changes platform is characterized in that, said method comprises:
The platform instruction is changed in reception;
Change platform instruction and judge that the said platform target channel of changing is whether in the platform group is changed in preparation based on said;
If be judged as be, then use the Program Map Table PMT and the Entitlement Control Message ECM data of the said target channel of buffer memory in advance, realize changing platform;
If be judged as not, then receive the PMT of said target channel, open audio frequency and video and ECM passage after the analysis, receive ECM, realize changing platform;
After platform is changed in realization, rebuild preparation and change the platform group.
2. method according to claim 1 is characterized in that,
Saidly rebuild preparation and comprise after changing the step of platform group:
Open the PMT and the ECM passage of the channel that the said preparation that rebuilds changes the platform group;
All PMT and the ECM data of the channel of platform group are changed in the said preparation that rebuilds of buffer memory.
3. method according to claim 1 is characterized in that,
Said reception comprises after changing platform instruction step:
Close the audio frequency and video passage of current channel, the PMT of said current channel and ECM passage stay open.
4. method according to claim 1 is characterized in that,
Said reception comprises before changing platform instruction step: make up preparation and change the platform group;
The construction step that the platform group is changed in said preparation comprises:
Calculate the upper limit that the platform group is changed in preparation, if the demultiplexing chip is except that the shared passage of normal open wireless tunnel and current channel, X vacant passage of residue, and if each channel needs Y passage to do and changes platform in advance, M=X/Y then, M prepares the upper limit of changing the platform group;
Wherein, when the channel quantity of a certain frequency is N, if M is more than or equal to (N-1), except in progress channel, other all channels constitute preparation and change the platform group on the then current frequency; If M is less than (N-1), except in progress channel, (N-1) the platform group is changed in M the channel formation preparation in the individual channel on the then current frequency; Wherein, X, Y, M and N are positive integer;
Calculate that preparation changes the platform group, if current channel is i channel Oi, wherein i belongs to 1 to N, and the direction of at first once changing platform before the record is an initial point with said i promptly, and writing down the said platform direction of changing is the direction that reduces along i or along the direction of i increase; Begin to calculate from channel Oi then to changing the platform direction; If arrive the border of said frequency, promptly 1 or N, also be not accumulated to preparation and change the upper limit M of platform group; Then calculate that along changing platform direction in the opposite direction channel number up to accumulative total reaches M, accomplishes the structure that the platform group is changed in said preparation; Or begin to calculate to changing the platform direction from channel Oi, do not run into the border of said frequency but the accumulative total channel number has reached M, accomplish the structure that the platform group is changed in said preparation;
The step that the platform group is changed in said structure preparation comprises afterwards:
Open the PMT and the ECM passage of the channel that said preparation changes the platform group;
All PMT and the ECM data of the channel of platform group are changed in the said preparation of buffer memory.
5. method according to claim 1 is characterized in that,
The step that the platform instruction is changed in said reception comprises afterwards:
Judge and saidly change the platform target channel and whether current channel is same frequency;
If be judged as not, then directly close the demultiplexing chip channel that the platform group is changed in said preparation, change platform after said target channel, the platform group is changed in the reconstruct preparation.
6. a STB is characterized in that, said STB comprises:
Receiver module is used for reception and changes the platform instruction;
First judge module is used for changing platform instruction and judging that the said platform target channel of changing is whether in the platform group is changed in preparation according to said;
First changes the platform module, is used in the judged result of said first judge module using the Program Map Table PMT and the Entitlement Control Message ECM data of the said target channel of buffer memory in advance when being, realizes changing platform;
Second changes the platform module, is used in the judged result of said first judge module receiving the PMT of said target channel for not the time, opens audio frequency and video and ECM passage after the analysis, receives ECM, and platform is changed in realization;
Reconstructed module after being used for realizing changing platform, rebuilds preparation and changes the platform group.
7. STB according to claim 6 is characterized in that, said STB comprises:
First opens module, after being used for said reconstructed module and rebuilding preparation and change the platform group, opens the PMT and the ECM passage of the channel that the said preparation that rebuilds changes the platform group;
First cache module is used for all PMT and ECM data that the channel of platform group is changed in the said preparation that rebuilds of buffer memory.
8. STB according to claim 6 is characterized in that, said STB comprises:
Closing module, be used for said receiver module receive change the platform instruction after, close the audio frequency and video passage of current channel, the PMT of said current channel and ECM passage stay open.
9. STB according to claim 6 is characterized in that, said STB comprises:
Make up module, be used for making up preparation and change the platform group, change the platform instruction with reception and change platform;
Said structure module specifically is used for:
Calculate the upper limit that the platform group is changed in preparation, if the demultiplexing chip is except that the shared passage of normal open wireless tunnel and current channel, X vacant passage of residue, and if each channel needs Y passage to do and changes platform in advance, M=X/Y then, M prepares the upper limit of changing the platform group;
Wherein, when the channel quantity of a certain frequency is N, if M is more than or equal to (N-1), except in progress channel, other all channels constitute preparation and change the platform group on the then current frequency; If M is less than (N-1), except in progress channel, (N-1) the platform group is changed in M the channel formation preparation in the individual channel on the then current frequency; Wherein, X, Y, M and N are positive integer;
Calculate that preparation changes the platform group, if current channel is i channel Oi, wherein i belongs to 1 to N, and the direction of at first once changing platform before the record is an initial point with said i promptly, and writing down the said platform direction of changing is the direction that reduces along i or along the direction of i increase; Begin to calculate from channel Oi then to changing the platform direction; If arrive the border of said frequency, promptly 1 or N, also be not accumulated to preparation and change the upper limit M of platform group; Then calculate that along changing platform direction in the opposite direction channel number up to accumulative total reaches M, accomplishes the structure that the platform group is changed in said preparation; Or begin to calculate to changing the platform direction from channel Oi, do not run into the border of said frequency but the accumulative total channel number has reached M, accomplish the structure that the platform group is changed in said preparation;
Second opens module, after being used for the preparation of said structure module construction and changing the platform group, opens the PMT and the ECM passage of the channel that said preparation changes the platform group;
Second cache module is used for all PMT and ECM data that the channel of platform group is changed in the said preparation of buffer memory.
10. STB according to claim 6 is characterized in that, said STB comprises:
Second judge module, be used for said receiver module receive change the platform instruction after, judge and saidly change the platform target channel and whether current channel is same frequency;
The 3rd changes the platform module, is used in the judged result of said second judge module directly closing the demultiplexing chip channel that the platform group is changed in said preparation for not the time, changes platform after said target channel, and the platform group is changed in the reconstruct preparation.
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