CN104768058A - Rapid channel switch technology for set top box - Google Patents
Rapid channel switch technology for set top box Download PDFInfo
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- CN104768058A CN104768058A CN201410001058.8A CN201410001058A CN104768058A CN 104768058 A CN104768058 A CN 104768058A CN 201410001058 A CN201410001058 A CN 201410001058A CN 104768058 A CN104768058 A CN 104768058A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4383—Accessing a communication channel
- H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
Abstract
The invention discloses a method and system for realizing rapid channel switch of a set top box. The system comprises a program acquisition device for acquiring program information from each preset frequency point in sequence, a user selection receiving device for receiving the selection of the program information by a user, a program playing device for receiving program information data corresponding to a program selected by the user and displaying the descrambled and decoded program information data, a background processing device for processing the program information data corresponding to the program selected by the user and performing background processing on the program information data of other programs on the same frequency point as the program selected by the user, and saving the processed program data in a storage corresponding to each program without displaying, and a switching device for reading and displaying the processed program data of one of the processed programs when the user switches to the program.
Description
Technical field
The present invention relates to a kind of digital television techniques, particularly relate to a kind of technology of the Set Top Box fast channel switching for Digital Television.
Background technology
Abbreviation and Key Term definition
STB:Set Top Box Set Top Box
ECM:Entitlement Control Message Entitlement Control Message
EMM:Entitlement Management Message Entitlement Management Message
PSI:Program Specific Information Program Specific Information
EIT:Event Information Table Event Information Table
Digital Television just refers to that from studio to all links of launching, transmitting, receiving be all use digital television signal or the signal propagation all to this system to be all the television genre that the digital stream by being made up of 0,1 numeric string is propagated, relative with simulated television.Its loss of signal is little, and reception is good.
Set Top Box is also called " digital TV set-top box ", and it is a kind of conversion equipment, digital television radio-frequency signal can be converted to numeral or analog audio-video signal that panel TV or common CRT TV can receive process.Ground, wired and a few class such as satellite and IPTV can be divided into by transmission medium, SD and high definition two kinds can be divided into by video definition.Set Top Box is made up of hardware and software.Hardware mainly comprises the compositions such as mainboard, power supply, front panel, tuner, audio and video output interface, card reader, shell.Software comprises the parts such as guiding and ROMPaq, operating system, middleware, application program.
Set Top Box can receive the basic TV of many covers and broadcast program, and user can select according to the hobby of oneself, and channel switch has just become user to operate the most frequently, so the optimization of time of switching channels also will promote the experience of user greatly.The zapping step of Set Top Box mainly comprises: signal madulation, demodulation chip channel demodulation, PSI data receiver, ECM data receiver, audio, video data demultiplexing, and descrambler carries out data deciphering, and decoder carries out data decode and then shows.
Fig. 1 illustrates the key step of the basic zapping technology of STB in prior art and required time accounting, spacing in Fig. 1 between two vertical lines represents the ratio shared by the whole zapping time, due to channel demodulation, audio, video data demultiplexing, descrambling, decode procedure be other more complicated relatively, so time loss is maximum.Can find out that the current zapping time mainly consumes two steps clearly from Fig. 1, one is the demodulation of demodulator; The time loss point that another one is larger is the acquisition of audio, video data, and the acquisition of audio, video data mainly comprises demultiplexing, descrambling, decoding three steps.
The major defect of prior art is, the key step of different program zapping is serial process, and compared with simulated television before, zapping speed is slow.
Summary of the invention
The subject matter that the present invention solves how to optimize the zapping treatment step of STB, thus reach the object promoting zapping speed.
For solving the problems of the technologies described above, the present invention proposes a kind of method realizing Set Top Box fast channel switching, the method comprises the steps:
1) programme information is obtained from each preset frequency successively;
2) user is received to the selection of described programme information;
3) obtain the program information data corresponding to programme information that user selects, show after to described program information data descrambling and decoding;
4) while the program information data corresponding to user-selected programme information is processed, the program information data of other programs of a frequency of being coexisted by the program selected with user carries out background process, the program information data after process is preserved respectively in memory;
5) when user is switched to above-mentioned one of them processed program, read the processed program information data of this program from described memory, and show.
Further, described step 1) comprise from each preset frequency acquisition programme information: resolve the Program Association Table PAT each frequency, Program Map Table PMT, SDT Service Description Table SDT.
Further, described step 1) in the audio/video program data of multiple programme informations that comprise of each frequency and associated data multiplexing in same transport stream.
Further, described step 1) in the programme information of identical frequency is organized together, carry out linear ordering, the programme information with current broadcasting carried out back-end data reception and process with the adjacent program information of frequency.
Further, described Set Top Box can carry out background process to the program information data of two or more frequency simultaneously.
For solving the problems of the technologies described above, the present invention proposes a kind of system realizing Set Top Box fast channel switching, this system comprises:
Program acquisition device, obtains programme information from each preset frequency successively;
User selects receiving system, receives user to the selection of described programme information;
Program broadcasting apparatus, obtains the program information data corresponding to programme information that user selects, and shows after to described program information data descrambling and decoding;
Background process device, while the program information data corresponding to user-selected programme information is processed, the program information data of other programs of a frequency of being coexisted by the program selected with user carries out background process, the program information data after process is preserved respectively in memory;
Switching device shifter, when user is switched to above-mentioned one of them processed program, reads the processed program information data of this program from described memory, and shows.Further, program acquisition device comprises from each preset frequency acquisition programme information: resolve the Program Association Table PAT each frequency, Program Map Table PMT, SDT Service Description Table SDT.
Further, the audio/video program data of multiple programme informations that comprise of each frequency and associated data multiplexing in same transport stream.
Further, program acquisition device organizes together the programme information of identical frequency, carries out linear ordering, and the programme information with current broadcasting is carried out back-end data reception and process with the adjacent program information of frequency.
Further, described Set Top Box can carry out background process to the program information data of two or more frequency simultaneously.。
The present invention uses background process, demultiplexing, descrambling, decoding are carried out to the audio, video data of multiple programs of same frequency simultaneously, only show the current program play, but user is switched to the program carrying out data processing, can directly show, save the time of data processing, thus improve zapping speed.
Accompanying drawing explanation
Fig. 1 is digital TV set-top box zapping flow chart.
Fig. 2 is Set Top Box zapping process chart of the present invention.
Fig. 3 is the program organization chart with frequency in Set Top Box of the present invention.
Fig. 4 is the method flow diagram that the present invention realizes Set Top Box fast channel switching.
Fig. 5 is the system configuration that the present invention realizes Set Top Box fast channel switching.
Embodiment
In Digital Television, all videos, audio frequency, word, picture etc. all become data after digitized processing, and pack according to the standard of MPEG-2, form the transmission bag of regular length, then these packets are carried out multiplexing, form transport stream (Transport Stream, TS).The corresponding TS stream of a usual channel, the TS stream of a channel is made up of multiple program and business.
In addition, in MPEG-2, special definition program specific information (Program Specific Information, PSI), its effect is Lookup protocol and guides digital television receiver to decode.PSI information is inserted in TS stream by multiplexer when multiplexing, and identifies by specific Packet Identifier (Packet Identifer, PID).
The programme information PSI defined in Moving Picture Experts Group-2, it is the description to single code stream, because system exists multiple code stream usually, in order to the business making user can find out oneself needs rapidly in many code streams, at DVB, the PSI of MPEG-2 is expanded, the basis of PSI tetra-table adds nine tables again, forms business information (Service Information, SI).
Embodiment 1
Fig. 4 is the method flow diagram of Set Top Box fast channel switching of the present invention, and it mainly comprises the following steps:
Step S101, obtains programme information from each preset frequency successively.
After digital television receiver starts, first sky machine tuning is carried out, according to the preset frequency list of front end agreement, lock each frequency successively, receive, Program Association Table (the Program Association Table resolved under each frequency, PAT), Program Map Table (Program Map Table, and SDT Service Description Table (Service Description Table PMT), the various form such as SDT), thus the programme information comprised under each frequency can be obtained, these information are saved for showing in the rendition list.
Step S102, receives user to the selection of described programme information.
Step S103, obtains the program information data corresponding to programme information that user selects, and shows after to described program information data descrambling and decoding.
User can pass through operation the rendition list by set-top box remote controller or other any remote control equipments (such as some smart mobile phone also can realize distant control function by study at present), program is selected to watch, the program sequence number that digital television receiver is selected according to user, the frequency that locking is corresponding with it, the pmt table of real-time reception actual program, after pmt table successfully receives, Set Top Box needs pmt table to be sent to condition access (Conditional Access on the one hand, CA) system realizes the descrambling to ciphered program, need the Audio PID obtaining actual program by analyzing pmt table on the other hand, video PID and timer reference of programs (Program Clock Reference, PCR) pid value, these three kinds of PID are set in the passage corresponding with it, start decoder, get sound, video original data, then D/A converter module is passed through, just can by sound, video content is presented on television screen.The acquisition of audio, video data mainly comprises demultiplexing, descrambling, decoding three steps.
Fig. 2 is Set Top Box zapping process chart of the present invention.In Digital Television, all videos, audio frequency, word, picture etc. all become data after digitized processing, and pack according to the standard of MPEG-2, form the transmission bag of regular length, then these packets are carried out multiplexing, form transport stream (Transport Stream, TS).The corresponding TS stream of a usual channel, the TS stream of a channel is made up of multiple program and business.In digital TV network environment, normal conditions are all that several audio/video program data and associated data thereof are multiplexing in same transport stream, use ISO/IEC13818-1 or other similar standard agreements.
Step S104, while the program information data corresponding to user-selected programme information is processed, the program information data of other programs of a frequency of being coexisted by the program selected with user carries out background process, program data after process is preserved in memory respectively, but does not show.
As shown in Figure 2, when a joint destination data is while received, descrambling, decoding display, other programs also can carry out on backstage receiving simultaneously, descrambling and decoding, but do not show, when user is from a channel switch to the channel carrying out background process, can save down in the time of background process step, thus reach the object of fast switching channels.Memory wherein for storing the program information data that background process is crossed can select volatile memory, as memories such as SDRAM, DDR, also can select nonvolatile memory, as FLASH memory etc.All program information data can be stored in same memory, for different program information data arranges different memory spaces, such as adopt the form of two-dimensional chain table, each frequency takies an one dimension chained list, each program information data under frequency takies a program of this one dimension chained list, and being then connected into by the one-dimensional chain watch chain that all frequencies use is a two-dimensional chain table.
Step S105, when user is switched to above-mentioned one of them processed program, reads the processed program data of this program from described memory, and shows.
If we want to realize this zapping optimisation technique on the STB of an independent tuner, it is also very important for carrying out adjusting for home network, as shown in Figure 3, the program set of identical frequency is needed to be woven in together, carry out linear ordering, selection current playing program carries out back-end data reception with the adjacent program of frequency, and the number of background process program determined by system resource situation.
Also STB can be made to lock 2 even more frequencies by software and hardware technology simultaneously, can realize across frequency fast channel switching, and better can play the effect of this technology like this.
Embodiment 2
As described in Figure 5, the invention provides a kind of system realizing Set Top Box fast channel switching, this system comprises:
Program acquisition device 1, obtains programme information from each preset frequency successively;
User selects receiving system 2, receives user to the selection of described programme information;
Program broadcasting apparatus 3, obtains the program information data corresponding to programme information that user selects, and shows after to described program information data descrambling and decoding;
Background process device 4, while the program information data corresponding to user-selected programme information is processed, the program information data of other programs of a frequency of being coexisted by the program selected with user carries out background process, is preserved respectively in memory by the program data after process;
Switching device shifter 5, when user is switched to above-mentioned one of them processed program, reads the processed program information data of this program from described memory, and shows.
When user uses user to select receiving system 3 to select next program, select receiving system 3 that the selection information of user is sent to switching device shifter 5, if when what user selected is the processed program in backstage, processed program information data can be read fast from memory, and display on a television set, thus improve the zapping speed of Set Top Box.Described user selects receiving system 3 can be set-top box remote controller or other any remote control equipments (such as some smart mobile phone also can realize distant control function by study at present).
The present invention uses background process, demultiplexing, descrambling, decoding are carried out to the audio, video data of multiple programs of same frequency simultaneously, only show the current program play, but user is switched to the program carrying out data processing, can directly show, save the time of data processing, thus improve zapping speed.
By the present invention, user's switching channels faster can be allowed, lock the program oneself liked, promote the experience of user.And by the present invention, solve the problem that changing channels of digital television speed is slower than simulated television, more user can be made to transfer to use Digital Television from use simulated television.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement and improvement etc., all should protect within protection scope of the present invention.
Claims (10)
1. realize a method for Set Top Box fast channel switching, the method comprises the steps:
1) programme information is obtained from each preset frequency successively;
2) user is received to the selection of described programme information;
3) obtain the program information data corresponding to programme information that user selects, show after to described program information data descrambling and decoding;
4) while the program information data corresponding to user-selected programme information is processed, the program information data of other programs of a frequency of being coexisted by the program selected with user carries out background process, the program information data after process is preserved respectively in memory;
5) when user is switched to above-mentioned one of them processed program, read the processed program information data of this program from described memory, and show.
2. method according to claim 1, described step 1) in obtain programme information from each preset frequency and comprise: resolve the Program Association Table PAT each frequency, Program Map Table PMT, SDT Service Description Table SDT.
3. method according to claim 1, described step 1) in the audio/video program data of multiple programme informations that comprise of each frequency and associated data multiplexing in same transport stream.
4. method according to claim 1, described step 1) in the programme information of identical frequency is organized together, carry out linear ordering, the programme information with current broadcasting carried out back-end data reception and process with the adjacent program information of frequency.
5., according to the method one of claim 1-4 Suo Shu, described Set Top Box can carry out background process to the program information data of two or more frequency simultaneously.
6. realize a system for Set Top Box fast channel switching, this system comprises:
Program acquisition device, obtains programme information from each preset frequency successively;
User selects receiving system, receives user to the selection of described programme information;
Program broadcasting apparatus, obtains the program information data corresponding to programme information that user selects, and shows after to described program information data descrambling and decoding;
Background process device, while the program information data corresponding to user-selected programme information is processed, the program information data of other programs of a frequency of being coexisted by the program selected with user carries out background process, the program information data after process is preserved respectively in memory;
Switching device shifter, when user is switched to above-mentioned one of them processed program, reads the processed program information data of this program from described memory, and shows.
7. system according to claim 6, program acquisition device obtains programme information from each preset frequency and comprises: resolve the Program Association Table PAT each frequency, Program Map Table PMT, SDT Service Description Table SDT.
8. system according to claim 6, the audio/video program data of multiple programme informations that each frequency comprises and associated data multiplexing in same transport stream.
9. method according to claim 6, program acquisition device organizes together the programme information of identical frequency, carries out linear ordering, and the programme information with current broadcasting is carried out back-end data reception and process with the adjacent program information of frequency.
10., according to the system one of claim 6-9 Suo Shu, described Set Top Box can carry out background process to the program information data of two or more frequency simultaneously.
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| WO2017219870A1 (en) * | 2016-06-20 | 2017-12-28 | 深圳创维数字技术有限公司 | Method and device for playing video data |
| CN107896341A (en) * | 2017-11-30 | 2018-04-10 | 青岛海信电器股份有限公司 | The player method and television equipment of a kind of scrambled program |
| CN108289240A (en) * | 2018-01-30 | 2018-07-17 | 深圳创维数字技术有限公司 | Method, terminal and the computer-readable medium of DTV fast channel switching |
| CN108737886A (en) * | 2017-04-25 | 2018-11-02 | 澜至电子科技（成都）有限公司 | Fast switching system, method and the top box of digital machine of digital program |
| CN108965908A (en) * | 2018-07-19 | 2018-12-07 | 深圳国微视安科技有限公司 | A kind of method of quick obtaining program TS stream |
| CN110166824A (en) * | 2019-06-24 | 2019-08-23 | 湖南国科微电子股份有限公司 | Live telecast cut bank method and system based on set-top box |
| CN111050207A (en) * | 2019-12-05 | 2020-04-21 | 海信电子科技（深圳）有限公司 | Television channel switching method and television |
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Application publication date: 20150708 |