CN104703026A - Method for quickly changing digital television scrambling programs - Google Patents
Method for quickly changing digital television scrambling programs Download PDFInfo
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- CN104703026A CN104703026A CN201510059217.4A CN201510059217A CN104703026A CN 104703026 A CN104703026 A CN 104703026A CN 201510059217 A CN201510059217 A CN 201510059217A CN 104703026 A CN104703026 A CN 104703026A
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Abstract
The invention discloses a method for quickly changing digital television scrambling programs and relates to the field of a digital television and a conditional access system. The method comprises the following steps of extracting ECMPID and PID of audios and videos, PMT PID of programs and Service ID information according to SYSTEM ID of the companies with different CA systems when searching of the programs, and creating and storing program list information; transmitting the scrambling information in the program list to the CA system when changing the scrambling program; monitoring program updating conditions at a backstage, if the updated program is present, updating the corresponding program information in the program list, and transmitting the updated scrambling information to the CA system. The method is characterized in that the scrambling information is directly acquired from a program list database and transmitted to the CA system when the program is searched, so that the time of acquiring the PMT table from actual signals is saved, the channel-changing time of the scrambling program is shortened and the user experience is also increased.
Description
Technical field
The present invention relates to Digital Television and condition reception (conditional access, CA) system regions, a kind of method of Digital Television scrambled program fast channel switching.
Background technology
Along with popularizing of Digital Television, the requirement of user to the digital program zapping time is more and more higher, and General Requirements switches with frequency program will in 2 seconds, and pilot frequency point program switches and will complete in 3 seconds.
The general step of scrambled program descrambling first jumps to program place frequency to carry out semaphore lock, then Program Map Table (the Program Map Table in actual signal is obtained, PMT), and extract the PMT information needed for CA according to the real needs of different manufacturers CA system, carry out audio frequency and video Entitlement Control Message (Entitlement Control Message, ECM) data filtering, then issue smart card or submit control word (the CONTROL WORD required for CA inside parsing program descrambling to, CW), finally CW is set to demultiplexing (DEMUX), realize the descrambling operation of audio frequency and video.
Current CA system zapping descrambling all needs the information obtaining descrambling needs from PMT, and the information that different CA needs is different, the audio frequency and video ECMPID of the system identifier (SYSTEMID) of the corresponding CA of some needs; The CA descriptor of the SYSTEMID of the corresponding CA of some needs, what have then needs whole pmt table lattice.The factor of current restriction zapping speed mainly contain following some:
(1) the locking frequency point time of TUNER;
(2) pmt table lattice acquisition time (for scrambled program);
(3) the I frame period time in video flowing.
Summary of the invention
The object of the invention is to overcome above-mentioned prior art not enough, a kind of method of Digital Television scrambled program fast channel switching is provided.
In order to reach above-mentioned technique effect, the present invention takes following technical scheme: a kind of method of Digital Television scrambled program fast channel switching, comprises the following steps:
A., when program searching, according to SYSTEM ID extraction audio frequency and video ECM PID, the audio frequency and video PID of different CA system house, the PMT PID of program and Service id information, create and programs stored list information;
B., during scrambled program zapping, CA system is issued with the descrambling information in the rendition list;
C. simultaneously in background monitoring program updating situation, if there is program updating, then upgrade programme information corresponding in the rendition list, and the descrambling information after upgrading is sent to CA system.
Further technical scheme is: when performing step a, when doing program searching, only extract active user and support the descrambling information that the SYSTEM ID of CA system is corresponding, comprise the PMT PID of program, Service ID, audio frequency and video type, the PID of audio, video data and the pid information of the corresponding ECM data of audio frequency and video, and join in program data storehouse and store, the SYSTEM ID of other CA systems is not processed.
Further technical scheme is: when performing step b, during user's zapping, if scrambled program then extracts CA descrambling information according to the requirement of CA system.
Further technical scheme is: if CA system needs audio frequency and video ECM PID, then directly use the ECM PID in program data storehouse; If CA needs the CA descriptor in PMT or whole pmt table lattice, then according to audio frequency and video ECM PID, the audio frequency and video PID in the SYSTEM ID of the CA system of User support, program data storehouse and audio frequency and video type, re-construct a CA descriptor or pmt table lattice send to CA system.
Further technical scheme is: when performing step c, program background monitoring program updating, and the pmt table lattice content according to program calculates CRC check value; When the pmt table lattice CRC of program changes, then in PMT, again extract active user support audio frequency and video ECM PID, audio frequency and video PID that the SYSTEM ID of CA system is corresponding and audio frequency and video type, and be updated in program data storehouse, re-execute step b.
The present invention compared with prior art, there is following beneficial effect: be different from prior art, this method is without the need to increasing program's memory space, by program searching recorded program descrambling information needed, the time obtaining the pmt table lattice needed for CA descrambling from actual signal can be saved, no matter to shorten with frequency or the zapping time of pilot frequency point, reach the zapping time shortening scrambled program, improve Consumer's Experience sense.
Accompanying drawing explanation
Fig. 1 is workflow diagram of the present invention.
Embodiment
Below in conjunction with embodiments of the invention, the invention will be further elaborated.
Embodiment:
As shown in Figure 1, a kind of method of Digital Television scrambled program fast channel switching, comprises the following steps:
S1, program searching module obtain the pmt table lattice data of each program according to the PMT PID of program when program searching, filter the CA descriptor of the CA SYSTEM ID of current support, parsing obtains audio frequency and video ECM PID, and the PID of the PMT PID of program, Service ID, audio frequency and video type, audio, video data, audio frequency and video ECM PID etc. information is joined programinfo structure body, set up program data storehouse and store.
After S2, user perform zapping, application query program database obtains the information such as PID, audio frequency and video ECM PID of PMT PID, the Service ID of program, audio frequency and video type, audio, video data.
S3, PMT data needed for the parameter request of CA system concrete zapping interface reconstruct CA system.If CA zapping interface parameters only requires ECM PID, then the ECM PID of audio frequency and video is passed to CA zapping interface; If CA zapping requires the descriptor passing CA, then according to the form of CA descriptor, the CA descriptor data reconstructing audio frequency and video with the CA SYSTEM ID of current support and the ECM PID of audio frequency and video pass to CA system.If CA zapping requires whole pmt table lattice data, then according to the data format of pmt table lattice SECTION, send to CA system with the reconstruct such as PID, program ServiceID pmt table lattice of the ECM PID of the CA SYSTEM ID of current support and audio frequency and video, audio frequency and video type, audio, video data.CA system can arrange the filter condition of audio frequency and video ECM data according to the PMT relevant information obtained, and filters out the ECM number of audio frequency and video, and gives CA system and go to resolve CW, is set to the descrambling that DEMUX completes audio, video data.
S4, program updating monitoring module are monitored pmt table lattice in real time, and the pmt table lattice data of actual program are read in timing, and record calculates crc value according to PMT data.When the CRC of the PMT finding actual program changes, then again support audio frequency and video ECMPID, audio frequency and video PID that the SYSTEMID of CA system is corresponding, audio frequency and video type pmt table lattice extracting data active user, be updated in program data storehouse.
S5, discovery PMT upgrade, and by the information such as audio frequency and video ECMPID, audio frequency and video PID, audio frequency and video type again extracted in the rendition list, the requirement with reference to step S3 sends to CA system, completes descrambling.
This method is without the need to increasing program's memory space, obtain descrambling information send to CA system by being directly stored in program data storehouse when program searching, to save the time obtaining pmt table lattice from actual signal, reach the zapping time shortening scrambled program, improve Consumer's Experience sense.
Be understandable that, the illustrative embodiments that above execution mode is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (5)
1. a method for Digital Television scrambled program fast channel switching, is characterized in that, comprises the following steps:
A., when program searching, according to SYSTEM ID extraction audio frequency and video ECM PID, the audio frequency and video PID of different CA system house, the PMT PID of program and Service id information, create and programs stored list information;
B., during scrambled program zapping, CA system is issued with the descrambling information in the rendition list;
C. simultaneously in background monitoring program updating situation, if there is program updating, then upgrade programme information corresponding in the rendition list, and the descrambling information after upgrading is sent to CA system.
2. the method for a kind of Digital Television scrambled program fast channel switching according to claim 1, it is characterized in that: when performing step a, when doing program searching, only extract active user and support the descrambling information that the SYSTEMID of CA system is corresponding, comprise the PMT PID of program, Service ID, audio frequency and video type, the PID of audio, video data and the pid information of the corresponding ECM data of audio frequency and video, and join in program data storehouse and store, the SYSTEMID of other CA systems is not processed.
3. the method for a kind of Digital Television scrambled program fast channel switching according to claim 1, is characterized in that: when performing step b, during user's zapping, if scrambled program then extracts CA descrambling information according to the requirement of CA system.
4. the method for a kind of Digital Television scrambled program fast channel switching according to claim 3, is characterized in that: if CA system needs audio frequency and video ECM PID, then directly uses the ECMPID in program data storehouse; If CA needs the CA descriptor in PMT or whole pmt table lattice, then according to audio frequency and video ECM PID, the audio frequency and video PID in the SYSTEM ID of the CA system of User support, program data storehouse and audio frequency and video type, re-construct a CA descriptor or pmt table lattice send to CA system.
5. the method for a kind of Digital Television scrambled program fast channel switching according to claim 1, is characterized in that: when performing step c, program background monitoring program updating, and the pmt table lattice content according to program calculates CRC check value; When the pmt table lattice CRC of program changes, then in PMT, again extract active user support audio frequency and video ECMPID, audio frequency and video PID that the SYSTEM ID of CA system is corresponding and audio frequency and video type, and be updated in program data storehouse, re-execute step b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510059217.4A CN104703026A (en) | 2015-02-04 | 2015-02-04 | Method for quickly changing digital television scrambling programs |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510059217.4A CN104703026A (en) | 2015-02-04 | 2015-02-04 | Method for quickly changing digital television scrambling programs |
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| CN104703026A true CN104703026A (en) | 2015-06-10 |
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| CN201510059217.4A Pending CN104703026A (en) | 2015-02-04 | 2015-02-04 | Method for quickly changing digital television scrambling programs |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109195008A (en) * | 2018-11-13 | 2019-01-11 | 青岛海信电器股份有限公司 | A kind of playback method and device of scrambled program |
| CN109413491A (en) * | 2018-11-16 | 2019-03-01 | 青岛海信电器股份有限公司 | A kind of method and device of the descrambling audio, video data for reducing bandwidth |
| CN109842814A (en) * | 2018-12-26 | 2019-06-04 | 深圳Tcl数字技术有限公司 | Switching method, device, television set and the readable storage medium storing program for executing of program |
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| CN1378742A (en) * | 1999-10-06 | 2002-11-06 | 汤姆森特许公司 | Method and system for handling two CA systems in same receiver |
| CN101667208A (en) * | 2009-09-25 | 2010-03-10 | 深圳创维数字技术股份有限公司 | Digital television receiver and methods for searching and switching programs thereof |
| CN101980541A (en) * | 2010-11-23 | 2011-02-23 | 华亚微电子（上海）有限公司 | Digital television receiving device and channel-switching method thereof |
| CN102685591A (en) * | 2012-05-22 | 2012-09-19 | 华亚微电子（上海）有限公司 | Digital set-top box |
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2015
- 2015-02-04 CN CN201510059217.4A patent/CN104703026A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378742A (en) * | 1999-10-06 | 2002-11-06 | 汤姆森特许公司 | Method and system for handling two CA systems in same receiver |
| CN101667208A (en) * | 2009-09-25 | 2010-03-10 | 深圳创维数字技术股份有限公司 | Digital television receiver and methods for searching and switching programs thereof |
| CN101980541A (en) * | 2010-11-23 | 2011-02-23 | 华亚微电子（上海）有限公司 | Digital television receiving device and channel-switching method thereof |
| CN102685591A (en) * | 2012-05-22 | 2012-09-19 | 华亚微电子（上海）有限公司 | Digital set-top box |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109195008A (en) * | 2018-11-13 | 2019-01-11 | 青岛海信电器股份有限公司 | A kind of playback method and device of scrambled program |
| CN109413491A (en) * | 2018-11-16 | 2019-03-01 | 青岛海信电器股份有限公司 | A kind of method and device of the descrambling audio, video data for reducing bandwidth |
| CN109842814A (en) * | 2018-12-26 | 2019-06-04 | 深圳Tcl数字技术有限公司 | Switching method, device, television set and the readable storage medium storing program for executing of program |
| WO2020135130A1 (en) * | 2018-12-26 | 2020-07-02 | 深圳Tcl数字技术有限公司 | Program switching method, device, television set, and readable storage medium |
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