CN102510488B - A kind of utilize broadcast characteristic to carry out audio-visual synchronization method and device - Google Patents
A kind of utilize broadcast characteristic to carry out audio-visual synchronization method and device Download PDFInfo
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- CN102510488B CN102510488B CN201110345276.XA CN201110345276A CN102510488B CN 102510488 B CN102510488 B CN 102510488B CN 201110345276 A CN201110345276 A CN 201110345276A CN 102510488 B CN102510488 B CN 102510488B
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Abstract
A kind of digital broadcast television audio and video synchronization method and device, the method comprises the following steps: receiving digital television broadcast singal, and after carrying out demodulation, resolving into audio data stream and video data stream, obtains current time; Obtain minimum audio frequency and video relative time, the fastest output time of broadcast cycle in broadcast cycle, and the slowest output time of broadcast cycle; Obtain stamp start-up time of broadcast cycle, synchronous Play Control is carried out to audio-video signal.Stamp start-up time that the present invention is stabbed by the absolute time of broadcast cycle in digital broadcasting-television signal and in broadcast cycle, the relative time stamp of audio frequency and video unit obtains broadcast cycle, under the broadcast environment of instability, can realize good result of broadcast.
Description
Technical field
The present invention relates to digital broadcast television field, particularly relate to a kind of digital broadcast television audio and video synchronization method and device.
Background technology
In prior art, received terrestrial digital broadcasting TV tech standard mainly contains following several: CMMB, DVB-H, DVB-T, T-DMB.Wherein, CMMB is the abbreviation of English ChinaMobileMultimediaBroadcasting (China Mobile's DMB), it is the system of first set towards multiple mobile terminal of domestic independent research, and " world " one covers, whole nation roaming to utilize S-band satellite-signal to realize.
And ripe gradually along with received terrestrial digital broadcasting TV tech, increasing mobile terminal adds digital broadcast television and receives and playing function, the received terrestrial digital broadcasting TV signal received is converted to intermediate-freuqncy signal, again intermediate-freuqncy signal is decomposed into audio/video flow and decodes, output audio and vision signal are play.And in digital broadcast television system, the reason often being had environment by broadcasting transmitting audio, video data causes terminal to receive mistake.If terminal receive data be continuous print, so audio frequency and video synchronously can be more difficult.
Summary of the invention
In order to solve the deficiency that prior art exists, the invention provides a kind of digital broadcast television audio and video synchronization method and device, utilize relative time stamp in the time migration between broadcast cycle and broadcast cycle to carry out audio-visual synchronization, under the broadcast environment of instability, realize good result of broadcast.
For achieving the above object, digital broadcast television audio and video synchronization method provided by the invention, the method comprises the following steps:
Receiving digital television broadcast singal, and after carrying out demodulation, resolving into audio data stream and video data stream, obtain current time;
Obtain minimum audio frequency and video relative time, the fastest output time of broadcast cycle in broadcast cycle, and the slowest output time of broadcast cycle;
Obtain stamp start-up time of broadcast cycle, synchronous Play Control is carried out to audio-video signal.
Wherein, described acquisition broadcast cycle start-up time stamp step further comprising the steps: when audio and video data streams be continuous print broadcast cycle and the fastest output time of broadcast cycle be less than broadcast cycle the slowest output time time, the slowest for broadcast cycle output time is stabbed the start-up time as broadcast cycle.
Wherein, described acquisition broadcast cycle start-up time stamp step further comprising the steps: when audio and video data streams be continuous print broadcast cycle and the fastest output time of broadcast cycle be greater than broadcast cycle the slowest output time time, the fastest for broadcast cycle output time is stabbed the start-up time as broadcast cycle.
Wherein, the step that the start-up time of described acquisition broadcast cycle stabs is further comprising the steps: when interruption has appearred in sound, video data stream broadcast cycle, then only carry out audio-visual synchronization according to present clock.
For achieving the above object, digital broadcast television audio-visual synchronization device provided by the invention, comprises digital broadcast television receiver module, the time kills modular converter, transmit control module, and audio/video decoding module, wherein,
Described digital broadcast television receiver module, for the received terrestrial digital broadcasting TV signal of reception is carried out demultiplexing through modulator-demodulator demodulation, demodulation multiplexer, is decomposed into audio frequency, video data stream;
The described time kills modular converter, and for the absolute time of broadcast cycle being stabbed, and in broadcast cycle, the relative time stamp of audio frequency and video unit is converted to stamp start-up time of broadcast cycle.
Described transmit control module, the start-up time according to described broadcast cycle stabs, and carries out Play Control to audio-video signal.
Described audio/video decoding module, decodes for audio frequency, the video data stream sent by digital broadcast television receiver module, reduction audio, vision signal.
For achieving the above object, a kind of mobile terminal with digital broadcast television receiving function provided by the invention, described mobile terminal comprises digital broadcast television audio-visual synchronization device according to claim 5.
Wherein, described mobile terminal is mobile phone, PDA, notebook computer or vehicle-mounted receiving terminal.
Stamp start-up time that the present invention is stabbed by the absolute time of broadcast cycle in digital broadcasting-television signal and in broadcast cycle, the relative time stamp of audio frequency and video unit obtains broadcast cycle, under the broadcast environment of instability, can realize good result of broadcast.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, and with content of the present invention together with embodiment, for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is according to digital broadcast television audio and video synchronization method flow chart of the present invention;
Fig. 2 is according to digital broadcast television audio-visual synchronization principle of device block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Fig. 1 is according to digital broadcast television audio and video synchronization method flow chart of the present invention, below with reference to Fig. 1, is described in detail digital broadcast television audio and video synchronization method of the present invention:
First, in step 101, receiving digital television broadcast singal, the standard of digital television broadcasting comprises CMMB, DVB-H, DVB-T, and T-DMB etc.;
In step 102, after digital TV broadcast signal is carried out demodulation, resolving into audio data stream and video data stream, obtain current time Tnow;
In step 103, obtain minimum audio frequency and video relative time in the cycle, if what receive is the 1st broadcast cycle, minimum audio frequency and video relative time then in this cycle is: Min (P0AR0, P0VR0), wherein P0AR0 is the relative time of the 1st audio unit in the 1st broadcast cycle, and P0VR0 is the relative time of the 1st video unit in the 1st broadcast cycle; If what receive is i-th broadcast cycle, minimum audio frequency and video relative time then in this cycle is: Min (PiAR0, PiVR0), PiAR0 is the relative time of the 1st audio unit in the i-th cycle, the relative time of video unit to be PiVR0 be the 1st video unit in the i-th cycle;
In step 104, calculate the output time that the broadcast cycle of reception is the fastest, if the 1st broadcast cycle, the fastest output time is:
T0=Tnow-Min(P0AR0,P0VR0)
In step 105, the cycle of judging whether is the broadcast cycle that 0(does not need to export), if the cycle is 0, then forward step 110 to, otherwise enter next step;
In step 106, judge whether broadcast cycle was continuous print cycle (difference in the time that this broadcast cycle arrives and upper cycle is the time of a broadcast cycle), if not consecutive periods, then calculate this cycle the fastest output time Ti=Tnow-Min (PiAR0, PiVR0) forward step 110 to, otherwise enter next step;
In step 107, the slowest output time T(Ti-1+PTi-PTi-1 according to Ti-1 computing cycle);
In step 108, judge whether cycle the fastest output time Ti is greater than cycle the slowest output time T, if Ti > is T, then forwards step 110 to, otherwise enter next step;
In step 109, the fastest for the cycle output time Ti is set as equaling cycle the slowest output time T;
In step 110, using Ti as the cycle start-up time stamp carry out audio and video playing.
That is: if i-th broadcast cycle, the fastest output time is:
(wherein, PTi is the absolute time stamp in i-th cycle to Ti=Max for (Ti-1+PTi-PTi-1), (Tnow-Min (PiAR0, PiVR0)).
In digital broadcast television system, system cycle ground broadcast transmission data.In order to all play immediately when ensureing that receiving terminal can at any time access, the audio, video data in each broadcast cycle comprises temporal information.Usually have the absolute time of broadcast cycle to stab, and the audio frequency and video unit in broadcast cycle comprise relative time stamp.
Be that the player in source generally keeps synchronous by the unidirectional timestamp increased continuously with file, and digital broadcast television can utilize relative time stamp in the time migration between broadcast cycle and broadcast cycle to come synchronous.
If continuous print broadcast cycle, then the broadcast cycle timestamp of basis and last time offsets and present clock, carries out synchronously to the clock of the audio frequency and video in each time cycle, exports in the respective cycle of audio frequency and video with each unit relative time stamp.
Fig. 2 is according to digital broadcast television audio-visual synchronization principle of device block diagram of the present invention, as shown in Figure 2, digital broadcast television audio-visual synchronization device of the present invention, comprise digital broadcast television receiver module 201, the time kills modular converter 202, transmit control module 203, and audio/video decoding module 204.
Digital broadcast television receiver module 201, for the received terrestrial digital broadcasting TV signal of reception is carried out demultiplexing through modulator-demodulator demodulation, demodulation multiplexer, after being decomposed into audio frequency, video data stream, the time is sent to kill modular converter 202 and audio/video decoding module 204 respectively.
Time kills modular converter 202, obtain the absolute time stamp of broadcast cycle, and in broadcast cycle, the relative time of audio frequency and video unit stabs from the audio and video data streams that digital broadcast television receiver module 201 sends, and is converted to stamp start-up time of broadcast cycle.
Transmit control module 203, the start-up time according to broadcast cycle stabs, and carries out Play Control to through the decoded audio-video signal of audio/video decoding module 204.
Audio/video decoding module 204, decodes for audio frequency, the video data stream sent by digital broadcast television receiver module 201, reduction audio, vision signal.
According to digital broadcast television audio-visual synchronization device of the present invention, can be arranged on there is digital broadcast television receiving function mobile terminal on, mobile terminal comprises: mobile phone, PDA, notebook computer, and vehicle-mounted receiving terminal etc.If what mobile terminal received is continuous print broadcast cycle, then the broadcast cycle timestamp of basis and last time offsets and present clock, carry out synchronously to the clock of the audio frequency and video in each time cycle, export with each unit relative time stamp in the respective cycle of audio frequency and video, if there is interruption in the cycle, then only carry out audio frequency and video clock synchronous according to present clock, good result of broadcast can be realized under the broadcast environment of instability.
One of ordinary skill in the art will appreciate that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme that foregoing embodiments is recorded, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a digital broadcast television audio and video synchronization method, the method comprises the following steps:
Receiving digital television broadcast singal, the standard of digital television broadcasting comprises CMMB, DVB-H, DVB-T, and T-DMB;
After digital TV broadcast signal is carried out demodulation, resolving into audio data stream and video data stream, obtain current time Tnow;
Obtain minimum audio frequency and video relative time in the cycle, if what receive is the 1st broadcast cycle, minimum audio frequency and video relative time then in this cycle is: Min (P0AR0, P0VR0), wherein P0AR0 is the relative time of the 1st audio unit in the 1st broadcast cycle, and P0VR0 is the relative time of the 1st video unit in the 1st broadcast cycle; If what receive is i-th broadcast cycle, minimum audio frequency and video relative time then in this cycle is: Min (PiAR0, PiVR0), PiAR0 is the relative time of the 1st audio unit in the i-th cycle, and PiVR0 is the relative time of the 1st video unit in the i-th cycle;
Calculate the output time that the broadcast cycle of reception is the fastest, if the 1st broadcast cycle, the fastest output time is:
T0=Tnow-Min(P0AR0,P0VR0)；
The cycle of judging whether is 0, does not namely need the broadcast cycle exported, if the cycle is 0, then Ti is carried out audio and video playing as stamp start-up time in cycle, otherwise enters next step;
Judge whether broadcast cycle is the continuous print cycle, namely the time of this broadcast cycle arrival and the difference in upper cycle are the time of a broadcast cycle, if not consecutive periods, then calculate this cycle the fastest output time Ti=Tnow-Min (PiAR0, PiVR0) and Ti is carried out audio and video playing as stamp start-up time in cycle, otherwise next step is entered;
The slowest output time T(Ti-1+PTi-PTi-1 according to Ti-1 computing cycle);
Judge whether cycle the fastest output time Ti is greater than cycle the slowest output time T, if Ti > is T, then Ti carried out audio and video playing as stamp start-up time in cycle, otherwise enter next step;
The fastest for cycle output time Ti is set as equaling cycle the slowest output time T;
Using Ti as the cycle start-up time stamp carry out audio and video playing.
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| JPH11308613A (en) * | 1998-04-22 | 1999-11-05 | Nippon Telegr & Teleph Corp <Ntt> | Video audio synchronizing method, its system and recording medium with video audio synchronization program recorded therein |
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| CN1960485A (en) * | 2006-08-29 | 2007-05-09 | 中兴通讯股份有限公司 | Method for playing back video and audio synchronistically in mobile media broadcast |
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| CN101282482A (en) * | 2008-05-04 | 2008-10-08 | 中兴通讯股份有限公司 | Apparatus, system and method for synchronously playing video data and audio data |
| CN101272499A (en) * | 2008-05-13 | 2008-09-24 | 中兴通讯股份有限公司 | Method and system for audio/video cocurrent flow transmission |
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