CN101883208B - Method for automatically restoring audio-frequency/visual-frequency synchronization of set top box - Google Patents
Method for automatically restoring audio-frequency/visual-frequency synchronization of set top box Download PDFInfo
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- CN101883208B CN101883208B CN201010226717XA CN201010226717A CN101883208B CN 101883208 B CN101883208 B CN 101883208B CN 201010226717X A CN201010226717X A CN 201010226717XA CN 201010226717 A CN201010226717 A CN 201010226717A CN 101883208 B CN101883208 B CN 101883208B
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- top box
- clock reference
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- frequency
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Abstract
The invention discloses a method for automatically restoring the audio-frequency/visual-frequency synchronization of a set top box. In the method, the temporary data error of a program reference clock of a transmitting end is automatically made up and restored by a program reference clock of a clock crystal oscillator of the set top box by the mutual coordinating and matching of the program reference clock of the transmitting end and the program reference clock of the clock crystal oscillator of the set top box, and the program reference clock of the clock crystal oscillator of the set top box is recalibrated by the program reference clock of the transmitting end. Each step is circulated and repeated in a playing process, thereby avoiding the occurrence of the phenomenon of audio-frequency blocking or visual-frequency blocking and the like caused by audio-frequency/visual-frequency asynchronism when a user watches programs effectively.
Description
Technical field
The present invention relates to a kind of audio and video synchronization method, relate in particular to a kind of method of automatically restoring audio-frequency/visual-frequency synchronization of set top box.
Background technology
In recent years, flourish along with Digital Television, radio and television operator provides increasing TV programme to watch for the user, and the TV programme of making from TV station is wherein arranged, satellite TV's program from satellite-signal is arranged, also have audio/video program from multimedia players such as DVD.So Duo program multiplexing arrives together, they all are the audio-visual synchronization signal of oneself separately, be Program Clock Reference (PCR), when being multiplexed into may cause together, they influence each other, perhaps the Program Clock Reference of program itself goes wrong, and it is asynchronous and cause the phenomenon that video interrupts suddenly or audio frequency interrupts suddenly to make that audio frequency and video appear in program when playing.The realization audio-visual synchronization of traditional digital TV set-top box is the numerical value of the Program Clock Reference that sent by the radio and television transmitting terminal, carry out corresponding audio-visual synchronization, if the Program Clock Reference that transmitting terminal sends is wrong, the nonsynchronous problem of audio frequency and video then can appear, i.e. the phenomenon that audio frequency interrupts suddenly or video interrupts suddenly.
Summary of the invention
The purpose of this invention is to provide a kind ofly, realize the method for automatically restoring audio-frequency/visual-frequency synchronization of set top box in the mode of automatic correction by using transmitting terminal Program Clock Reference and programs of set-top box reference clock to cooperatively interact.
For achieving the above object, the method for automatically restoring audio-frequency/visual-frequency synchronization of set top box comprises the steps:
Step 1: set-top box is switched to a frequency;
Step 2: search for the program aid table that transmitting terminal sends in this frequency;
Step 3: the Program Map Table that obtains to comprise in this frequency programme information;
Step 4: switch to the program that transmitting terminal sends in this frequency, obtain voice data packet identifier, video data packet identifier and the Program Clock Reference numerical value packet identifier of this program;
Step 5: with the voice data packet identifier of this program be set to set-top box the demultiplexing passage and with the audio decoder binding, the video data packet identifier of this program be set to the demultiplexing passage of set-top box and bind with Video Decoder;
Step 6: the Program Clock Reference numerical value packet identifier of this program that transmitting terminal is sent is set to the demultiplexing passage of set-top box, starts transmitting terminal Program Clock Reference synchronizing function and comes vectoring aircraft top box audio-visual synchronization;
Step 7: when receiving first transmitting terminal Program Clock Reference numerical value, starter motor top box 27,000,000 clock crystal oscillators are provided with the initial value of set-top box clock crystal oscillator by Program Clock Reference numerical value, and set-top box clock crystal oscillator begins counting;
Step 8:, the numerical value of the Program Clock Reference of the numerical value of the transmitting terminal Program Clock Reference that receives and set-top box clock crystal oscillator is compared every 1 to 10 second;
Step 9: if deviation is then closed transmitting terminal Program Clock Reference synchronizing function, the Program Clock Reference of starter motor top box clock crystal oscillator comes vectoring aircraft top box audio-visual synchronization; If deviation do not occur, then continue to adopt transmitting terminal Program Clock Reference synchronizing function to come vectoring aircraft top box audio-visual synchronization
Step 10: after the Program Clock Reference of employing set-top box clock crystal oscillator comes vectoring aircraft top box audio-visual synchronization, every 1 to 10 second, the numerical value of the Program Clock Reference of the numerical value of the transmitting terminal Program Clock Reference that receives and set-top box clock crystal oscillator is compared;
Step 11: come vectoring aircraft top box audio-visual synchronization if the deviation between the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and set-top box clock crystal oscillator less than variance thresholds, then recovers to start transmitting terminal Program Clock Reference synchronizing function; If deviation greater than variance thresholds, then continues to adopt the Program Clock Reference of set-top box clock crystal oscillator to come vectoring aircraft top box audio-visual synchronization;
Step 12: after recovery startup transmitting terminal Program Clock Reference synchronizing function is come vectoring aircraft top box audio-visual synchronization, the Program Clock Reference of set-top box clock crystal oscillator is calibrated, returned step 8 according to the numerical value of transmitting terminal Program Clock Reference.
Deviation between the numerical value of the Program Clock Reference of the numerical value of the described transmitting terminal Program Clock Reference of step 11 of the present invention and set-top box clock crystal oscillator is with the difference of the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and the set-top box clock crystal oscillator quotient divided by the numerical value gained of transmitting terminal Program Clock Reference.Described variance thresholds is a numerical value in 1% to 9%, wherein be preferably 5%, when the deviation between the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and set-top box clock crystal oscillator during, enter step 12, otherwise continue step 10 less than variance thresholds.
In sum, the present invention compared with prior art, the present invention utilizes the mutual cooperation of Program Clock Reference of transmitting terminal Program Clock Reference and set-top box clock crystal oscillator, automatically remedy and recover the temporary error in data of transmitting terminal Program Clock Reference with the Program Clock Reference of set-top box clock crystal oscillator, with the transmitting terminal Program Clock Reference Program Clock Reference of set-top box clock crystal oscillator is recalibrated, each step cycle is reciprocal in playing process, thus phenomenon such as the audio card that occurs causing owing to audio frequency and video are asynchronous when having avoided the user to watch program is effectively paused or video card pauses.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the flow chart of steps of automatically restoring audio-frequency/visual-frequency synchronization method.
Embodiment
As shown in Figure 1, the method for automatically restoring audio-frequency/visual-frequency synchronization of set top box comprises the steps:
Step 1: set-top box is switched to a frequency;
Step 2: search for the program aid table that transmitting terminal sends in this frequency;
Step 3: the Program Map Table that obtains to comprise in this frequency programme information;
Step 4: switch to the program that transmitting terminal sends in this frequency, obtain voice data packet identifier, video data packet identifier and the Program Clock Reference numerical value packet identifier of this program;
Step 5: with the voice data packet identifier of this program be set to set-top box the demultiplexing passage and with the audio decoder binding, the video data packet identifier of this program be set to the demultiplexing passage of set-top box and bind with Video Decoder;
Step 6: the Program Clock Reference numerical value packet identifier of this program that transmitting terminal is sent is set to the demultiplexing passage of set-top box, starts transmitting terminal Program Clock Reference synchronizing function and comes vectoring aircraft top box audio-visual synchronization;
Step 7: when receiving first transmitting terminal Program Clock Reference numerical value, starter motor top box 27,000,000 clock crystal oscillators are provided with the initial value of set-top box clock crystal oscillator by Program Clock Reference numerical value, and set-top box clock crystal oscillator begins counting;
Step 8:, the numerical value of the Program Clock Reference of the numerical value of the transmitting terminal Program Clock Reference that receives and set-top box clock crystal oscillator is compared every 1 to 10 second;
Step 9: if deviation is then closed transmitting terminal Program Clock Reference synchronizing function, the Program Clock Reference of starter motor top box clock crystal oscillator comes vectoring aircraft top box audio-visual synchronization; If deviation do not occur, then continue to adopt transmitting terminal Program Clock Reference synchronizing function to come vectoring aircraft top box audio-visual synchronization
Step 10: after the Program Clock Reference of employing set-top box clock crystal oscillator comes vectoring aircraft top box audio-visual synchronization, every 1 to 10 second, the numerical value of the Program Clock Reference of the numerical value of the transmitting terminal Program Clock Reference that receives and set-top box clock crystal oscillator is compared;
Step 11: come vectoring aircraft top box audio-visual synchronization if the deviation between the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and set-top box clock crystal oscillator less than variance thresholds, then recovers to start transmitting terminal Program Clock Reference synchronizing function; If deviation greater than variance thresholds, then continues to adopt the Program Clock Reference of set-top box clock crystal oscillator to come vectoring aircraft top box audio-visual synchronization;
Step 12: after recovery startup transmitting terminal Program Clock Reference synchronizing function is come vectoring aircraft top box audio-visual synchronization, the Program Clock Reference of set-top box clock crystal oscillator is calibrated, returned step 8 according to the numerical value of transmitting terminal Program Clock Reference.
Deviation between the numerical value of the Program Clock Reference of the numerical value of the described transmitting terminal Program Clock Reference of step 11 of the present invention and set-top box clock crystal oscillator is with the difference of the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and the set-top box clock crystal oscillator quotient divided by the numerical value gained of transmitting terminal Program Clock Reference.Described variance thresholds is a numerical value in 1% to 9%, wherein be preferably 5%, when the deviation between the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and set-top box clock crystal oscillator during, enter step 12, otherwise continue step 10 less than variance thresholds.
Claims (5)
1. the method for an automatically restoring audio-frequency/visual-frequency synchronization of set top box, it is characterized in that: described method comprises the steps:
Step 1: set-top box is switched to a frequency;
Step 2: search for the program aid table that transmitting terminal sends in this frequency;
Step 3: the Program Map Table that obtains to comprise in this frequency programme information;
Step 4: switch to the program that transmitting terminal sends in this frequency, obtain voice data packet identifier, video data packet identifier and the Program Clock Reference numerical value packet identifier of this program;
Step 5: with the voice data packet identifier of this program be set to set-top box the demultiplexing passage and with the audio decoder binding, the video data packet identifier of this program be set to the demultiplexing passage of set-top box and bind with Video Decoder;
Step 6: the Program Clock Reference numerical value packet identifier of this program that transmitting terminal is sent is set to the demultiplexing passage of set-top box, starts transmitting terminal Program Clock Reference synchronizing function and comes vectoring aircraft top box audio-visual synchronization;
Step 7: when set-top box is received first transmitting terminal Program Clock Reference numerical value that transmitting terminal sends, starter motor top box clock crystal oscillator, by Program Clock Reference numerical value the initial value of set-top box clock crystal oscillator is set, set-top box clock crystal oscillator begins counting;
Step 8:, the numerical value of the Program Clock Reference of the numerical value of the transmitting terminal Program Clock Reference that receives and set-top box clock crystal oscillator is compared every 1 to 10 second;
Step 9: if deviation is then closed transmitting terminal Program Clock Reference synchronizing function, the Program Clock Reference of starter motor top box clock crystal oscillator comes vectoring aircraft top box audio-visual synchronization; If deviation do not occur, then continue to adopt transmitting terminal Program Clock Reference synchronizing function to come vectoring aircraft top box audio-visual synchronization;
Step 10: after the Program Clock Reference of employing set-top box clock crystal oscillator comes vectoring aircraft top box audio-visual synchronization, every 1 to 10 second, the numerical value of the Program Clock Reference of the numerical value of the transmitting terminal Program Clock Reference that receives and set-top box clock crystal oscillator is compared;
Step 11: come vectoring aircraft top box audio-visual synchronization if the deviation between the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and set-top box clock crystal oscillator during less than variance thresholds, then recovers to start transmitting terminal Program Clock Reference synchronizing function; If deviation during greater than variance thresholds, then continues to adopt the Program Clock Reference of set-top box clock crystal oscillator to come vectoring aircraft top box audio-visual synchronization;
Step 12: after recovery startup transmitting terminal Program Clock Reference synchronizing function is come vectoring aircraft top box audio-visual synchronization, the Program Clock Reference of set-top box clock crystal oscillator is calibrated, returned step 8 according to the numerical value of transmitting terminal Program Clock Reference.
2. according to the method for a kind of automatically restoring audio-frequency/visual-frequency synchronization of set top box described in the claim 1, it is characterized in that: the deviation between the numerical value of the Program Clock Reference of the numerical value of the described transmitting terminal Program Clock Reference of step 11 and set-top box clock crystal oscillator is for the difference of the numerical value of the Program Clock Reference of the numerical value of transmitting terminal Program Clock Reference and the set-top box clock crystal oscillator quotient divided by the numerical value gained of transmitting terminal Program Clock Reference.
3. according to the method for a kind of automatically restoring audio-frequency/visual-frequency synchronization of set top box described in claim 1 or 2, it is characterized in that: described variance thresholds is a numerical value in 1% to 9%.
4. according to the method for a kind of automatically restoring audio-frequency/visual-frequency synchronization of set top box described in the claim 3, it is characterized in that: described variance thresholds is 5%.
5. according to the method for a kind of automatically restoring audio-frequency/visual-frequency synchronization of set top box described in the claim 1, it is characterized in that: described set-top box clock crystal oscillator is 27,000,000 clock crystal oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010226717XA CN101883208B (en) | 2010-07-14 | 2010-07-14 | Method for automatically restoring audio-frequency/visual-frequency synchronization of set top box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010226717XA CN101883208B (en) | 2010-07-14 | 2010-07-14 | Method for automatically restoring audio-frequency/visual-frequency synchronization of set top box |
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| CN101883208A CN101883208A (en) | 2010-11-10 |
| CN101883208B true CN101883208B (en) | 2011-11-02 |
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| CN201010226717XA Expired - Fee Related CN101883208B (en) | 2010-07-14 | 2010-07-14 | Method for automatically restoring audio-frequency/visual-frequency synchronization of set top box |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105704551B (en) * | 2016-03-23 | 2018-09-14 | 福建新大陆通信科技股份有限公司 | The method and system of set-top box intelligent synchronization are realized based on Zigbee-technology |
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| EP1493066A4 (en) * | 2002-04-05 | 2006-03-08 | Matsushita Electric Ind Co Ltd | Improved utilization of data broadcasting technology with handheld control apparatus |
| CN100481957C (en) * | 2006-05-22 | 2009-04-22 | 天栢宽带网络科技（上海）有限公司 | Medium synchronization method |
| CN101083718A (en) * | 2006-05-31 | 2007-12-05 | 北京汉辰科技有限公司 | LCD terminal information publish platform system |
| KR101454026B1 (en) * | 2008-04-28 | 2014-10-27 | 삼성전자주식회사 | Apparatus and method for providing broadcast contents in internet broadcast system |
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