CN103219029A - Method and system for automatically adjusting synchronization of audio and video - Google Patents
Method and system for automatically adjusting synchronization of audio and video Download PDFInfo
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Abstract
The invention discloses a method for automatically adjusting synchronization of audio and video. The method comprises the steps of outputting a test signal, acquiring light of a display device displaying pictures so as to generate a video pulse signal, converting the video pulse signal into a video digital signal and converting an audio pulse signal output by a power amplifier into an audio digital signal, calculating and memorizing real-time time delay of the audio pulse signal relative to the video digital signal in real time, calculating an average value of the real-time time delay, judging whether the average value is larger than a threshold value or not and modifying and memorizing video time delay or audio time delay according to a judgment result. Compared with the prior art, the method for automatically adjusting the synchronization of audio and video achieves automatic adjustment of the synchronization of audio and video, simplifies debugging process, improves the debugging efficiency and reduces debugging errors. The invention further discloses a system for automatically adjusting the synchronization of audio and video.
Description
Technical field
The present invention relates to the audio-visual synchronization technical field, relate more specifically to a kind of method and system of automatic adjusting audio-visual synchronization.
Background technology
Development along with audio-visual technology, high resolving power has become a kind of trend, HDTV, high definition player and high-definition audio and video resource are seen everywhere, HDMI(High Definition Multimedia Interface, HDMI (High Definition Multimedia Interface)) further promoted the development of high-definition audio and video technology especially as the appearance of high-definition audio and video equipment interface technology.Yet high resolving power means high data volume, and high quantity means the longer processing time.When playing HD video, because the processing delay of video data will be obviously greater than handling the required time delay of respective audio data, thereby when causing the audio-video signal play to arrive spectators, spectators can feel obviously that speaker's lip moves nonsynchronous situation in sound and the video.
Increased automatic lip type (Auto Lip sync) technology synchronously newly for addressing the above problem the above version of HDMI1.3, its permission is regulated the audio frequency and video processing delay on equipment, with the nonsynchronous problem of audio frequency and video processing delay brought of compensation self-clocking, thereby make equipment finish the process of audio-visual synchronization like clockwork automatically.And in the actual conditions, because the form of audio-video signal is various, and the processing delay of the required adjusting of audio-video signal of different-format also is not quite similar, simultaneously it also there are differences same Signal Processing time delay for different playback equipments, thus the work that is provided with synchronously when causing well finishing audio-video signal and playing.
For addressing the above problem, prior art at different playback equipments and different broadcast format when carrying out delay adjusting, mainly take artificial observation (naked eyes or utilize device measuring such as digital oscilloscope), Wei Tiao mode is carried out the adjusting of time delay repeatedly, to realize the effect of audio-visual synchronization.Yet prior art is not only time-consuming, effort, and the risk that exists mistake to survey, can not effectively guarantee every equipment delay transfer establish accurately.
Therefore, be necessary to provide a kind of method and system of automatic adjusting audio-visual synchronization to overcome above-mentioned defective.
Summary of the invention
The method that the purpose of this invention is to provide a kind of automatic adjusting audio-visual synchronization realizes the automatic adjusting of audio-visual synchronization, simplifies debug process, improves debugging efficiency and reduces the debugging error.
Another object of the present invention provides a kind of system of automatic adjusting audio-visual synchronization, realizes the automatic adjusting of audio-visual synchronization, simplifies debug process, improves debugging efficiency and reduces the debugging error.
To achieve these goals, the method for automatic adjusting audio-visual synchronization of the present invention comprises the steps:
The output test signal, described test signal comprises the sound signal of periodic vision signal and same period;
Delay when described vision signal is applied video and export display device to, and delay when described sound signal applied audio frequency and export power amplifying device to;
Light when gathering described display device display frame is to generate video pulse signal;
Described video pulse signal is converted to video signal and the audio pulse of described power amplifying device output is converted to audio digital signals;
Calculate in real time described audio digital signals with respect to the real-time time delay of described video signal and store;
Calculate the mean value of described real-time time delay;
Whether the absolute value of judging described mean value is greater than threshold value;
Revise and preserve described video time delay or described audio frequency time delay according to judged result.
Compared with prior art, the method of automatic adjusting audio-visual synchronization of the present invention is the output test signal earlier, photogenerated video pulse signal during again by the display frame of collection display device, audio pulse with video pulse signal and power amplifying device output is converted to video signal and audio digital signals again, calculate audio digital signals more in real time with respect to the real-time time delay of video signal and store, calculate the mean value of real-time time delay again, judge that more whether the absolute value of the mean value that calculates is greater than threshold value, revise and preserve video time delay or audio frequency time delay at last according to judged result, realize the automatic adjusting of audio-visual synchronization, simplified debug process, improve debugging efficiency and reduced the debugging error.
Particularly, described " revising and preserve described video time delay or described audio frequency time delay according to judged result " is specially:
When the absolute value of described mean value during greater than threshold value, judge whether described mean value is negative, if, then calculate described mean value and deduct the difference of described video time delay and revise described video time delay the absolute value that is described difference, otherwise, then calculate described mean value add the above audio frequency time delay and and revise described audio frequency time delay be described and.
Particularly, described method also comprises:
Described video time delay and described audio frequency time delay are set.
Particularly, described method also comprises:
According to judged result described mean value being sent to described display device shows.
Preferably, described vision signal is rendered as the periodically bright video pictures that secretly replaces, and described sound signal is rendered as periodic silence and the sound alternately that yowls.
Accordingly, the present invention also provides a kind of system of automatic adjusting audio-visual synchronization, and the light when comprising display device, power amplifying device and gathering described display device display frame is to generate the optical sensor of video pulse signal, and described playback equipment specifically comprises:
The audio frequency and video output module, be used to export test signal, described test signal comprises the sound signal of periodic vision signal and same period, delays when described vision signal applies video and exports display device to, delays when described sound signal applies audio frequency and exports power amplifying device to;
Signal processing module is used for the described video pulse signal that described optical sensor generates is converted to video signal and the audio pulse of described power amplifying device output is converted to audio digital signals;
First computing module is used for calculating in real time described audio digital signals with respect to the real-time time delay of described video signal and store;
Second computing module is used to calculate the mean value of described real-time time delay;
Judge module, whether the absolute value of the described mean value that is used to judge that described second computing module obtains is greater than threshold value;
Modified module is used for revising and preserve described video time delay or described audio frequency time delay according to judged result.
Particularly, described modified module comprises:
Judging unit is used to judge whether described mean value is negative;
First revises the unit, is used for calculating described mean value according to the judged result of described judging unit and deducts the difference of described video time delay and revise described video time delay the absolute value that is described difference;
Second revises the unit, be used for according to the judged result of described judging unit calculate described mean value add the above audio frequency time delay and and revise described audio frequency time delay be described and.
Particularly, described playback equipment also comprises:
Module is set, is used to be provided with described video time delay and described audio frequency time delay.
Particularly, described playback equipment also comprises:
Sending module is used for judged result according to described judge module and described mean value is sent to described display device shows.
Preferably, the described vision signal of described audio frequency and video output module output is rendered as the periodically bright video pictures that secretly replaces, and described sound signal is rendered as periodic silence and the sound alternately that yowls.
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is an embodiment process flow diagram of the method for automatic adjusting audio-visual synchronization of the present invention.
Fig. 2 is an example structure synoptic diagram of the system of automatic adjusting audio-visual synchronization of the present invention.
Fig. 3 is the structured flowchart of playback equipment among Fig. 2.
Fig. 4 is the structured flowchart of modified module among Fig. 3.
Fig. 5 is the circuit theory diagrams of optical sensor among Fig. 2.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
With reference to Fig. 1, the method for automatic adjusting audio-visual synchronization of the present invention comprises the steps:
Step S101 is provided with video time delay and audio frequency time delay; Being provided with of described video time delay and described audio frequency time delay is specific as follows:
VSDB:P_Video Latency=time delay value, the P_Audio_Latency=time delay value; Described time delay value is more than or equal to zero millisecond;
VSDB data block (Vendor Specific Data Block, the meaning of the P representative the data block that supplier is specific) is that Progress(lines by line scan) signal, the meaning of VSDB data block statement is for when for the P signal, the Video(video) signal and Audio(audio frequency) time delay value of signal; As: as described in being provided with the video time delay and as described in the audio frequency time delay be " 0 ", that is: VSDB:P_Video Latency=0, P_Audio_Latency=0, expression Video(video) signal and Audio(audio frequency) time delay of signal is 0 millisecond;
It should be noted that HDMI1.3 another situation to have stipulated also in the adjustment of the printing plate that described video time delay and described audio frequency time delay are provided with, as follows:
VSDB:I_Video Latency=time delay value, the I_Audio_Latency=time delay value;
The meaning of I in VSDB data block representative is the Interlace(staggered scanning) signal, the meaning of VSDB data block statement is for when for I signal, the Video(video) signal and Audio(audio frequency) time delay value of signal;
What deserves to be explained is, described video time delay and described audio frequency time delay be provided with will according to the scan mode of signal to wherein one group be provided with;
Step S102, the output test signal, described test signal comprises the sound signal of periodic vision signal and same period, particularly, described vision signal is rendered as the periodically bright video pictures that secretly replaces, and described sound signal is rendered as periodic silence and the sound alternately that yowls; As: the vision signal in the test signal is 1 second the complete white and complete alternately picture of deceiving in interval, and the yowl sound that complete white picture corresponding audio signal is " toot ... ", simultaneously complete black picture corresponding audio signal is noiseless, and promptly sound signal is the yowl sound of " toot ... " that replaced in 1 second at interval and noiseless;
Step S103 delays when described vision signal is applied described video and exports display device to, and delays when described sound signal applied described audio frequency and export power amplifying device to; What deserves to be explained is that described display device does not apply time delay to the described vision signal that receives, described power amplifying device does not apply time delay to the described sound signal that receives yet simultaneously;
Step S104, the light when gathering described display device display frame is to generate video pulse signal;
Step S105 is converted to described video pulse signal video signal and the audio pulse of described power amplifying device output is converted to audio digital signals; Noticeable, because the corresponding relation of audio-video signal in the test signal, described video signal should have consistent rule with described audio digital signals on coding;
Step S106 calculates described audio digital signals in real time with respect to the real-time time delay of described video signal and store; Particularly, the mistiming of the zero-time that described real-time time delay is described arbitrary cycle of audio digital signals and the zero-time of described video signal respective cycle, the described mistiming is when being negative, represent that described audio digital signals lags behind described video signal, show as audio frequency delay, the described mistiming is timing, represents that described audio digital signals is ahead of described video signal, and it is leading to show as audio frequency; As: as described in audio digital signals one-period zero-time and as described in mistiming of zero-time of video signal respective cycle be-73 milliseconds; And for example: the mistiming of the zero-time of described audio digital signals one-period and the zero-time of described video signal respective cycle is 77 milliseconds;
Step S107 calculates the mean value of described real-time time delay; Particularly, obtain the described real-time time delay of predetermined quantity to calculate described mean value; As: real-time time delay and to calculate its mean value be 75 as described in obtaining 100; And for example: obtaining 100 described real-time time delays and calculating its mean value is-83; And for example: obtaining 100 described real-time time delays and calculating its mean value is 20;
Whether step S108, the absolute value of judging described mean value greater than threshold value, if, execution in step S109 then, otherwise, execution in step S110 then; Particularly, described threshold value is the critical value of acceptable tin of spectators, vision mistiming; As: as described in threshold value be 65, described mean value is 75, so execution in step S109; And for example: described threshold value is 65, and described mean value is-83, so execution in step S109; And for example: described threshold value is 65, and described mean value is 20, so execution in step S110;
Step S109 judges whether described mean value is negative, if, execution in step S111 then, otherwise, execution in step S112 then; As: as described in mean value be-83, so execution in step S111; And for example: described mean value is 75, so execution in step S112;
Step S110 is sent to described display device with described mean value and shows; Particularly, described mean value is by OSD(on-screen display, the screen menu type regulative mode) stack or pop-up window mode show at described display device, conveniently to know described mean value, i.e. the time delay of audio frequency and video; As: with as described in mean value 20 be sent to as described in display device show by the OSD stacked system;
Step S111 calculates described mean value and deducts the difference of described video time delay and revise described video time delay the absolute value that is described difference; As: as described in mean value be-83, because the initial setting up value of described video time delay is 0, so obtaining the absolute value of described difference is 83, therefore the value of revising described video time delay is 83, be VSDB:P_Video Latency=83, P_Audio_Latency=0 is with the Video(video) 83 milliseconds of signal delays, with the Audio(audio frequency) 0 millisecond of signal delay;
Step S112, calculate described mean value add the above audio frequency time delay and and revise described audio frequency time delay be described and.As: as described in mean value be 75, because the initial setting up value of described audio frequency time delay is 0, so obtain described and be 75, therefore the value of revising described audio frequency time delay is 75, be VSDB:P_Video Latency=0, P_Audio_Latency=75 is with the Video(video) 0 millisecond of signal delay, with the Audio(audio frequency) 75 milliseconds of signal delays;
With reference to Fig. 2, the system 100 of automatic adjusting audio-visual synchronization of the present invention, comprise display device 10, power amplifying device 20, connect the playback equipment 30 of described display device 10 and described power amplifying device 20 and be connected described playback equipment 30 and described display device 10, the light when being used to gather described display device 10 display frames to generate the optical sensor 40 of video pulse signal.
Particularly, with reference to Fig. 2 and Fig. 3, described playback equipment 30 comprises:
Audio frequency and video output module 302, be used to export test signal, described test signal comprises the sound signal of periodic vision signal and same period, delays when described vision signal applies video to export display device 10 to, delays when described sound signal applies audio frequency and exports power amplifying device 20 to; Particularly, described vision signal is rendered as the periodically bright video pictures that secretly replaces, and described sound signal is rendered as periodic silence and the sound alternately that yowls;
Sending module 308 is used for judged result according to described judge module 306 and described mean value is sent to described display device 10 shows.Particularly, described mean value is by OSD(on-screen display, the screen menu type regulative mode) stack or pop-up window mode show at described display device 10, conveniently to know described mean value, i.e. the time delay of audio frequency and video.
Particularly, with reference to Fig. 4, described modified module 307 comprises:
Judging unit 3071 is used to judge whether described mean value is negative;
Particularly, with reference to Fig. 3 and Fig. 4, described optical sensor 40 comprises driving power 401, resistance 402, photodiode 403, earth point 404 and is used for the acquisition pulse signal and is passed to the sampling spot 405 of described signal processing module 303; Wherein, the resistance value of described resistance 402 is 100 Ω.
In sum, the system 100 of automatic adjusting audio-visual synchronization of the present invention exports test signals by the audio frequency and video output module 302 of playback equipment 30 earlier, photogenerated video pulse signal when gathering display device 10 display frames by optical sensor 40 again, signal processing module 303 by playback equipment 30 is converted to video signal and audio digital signals with the audio pulse of video pulse signal and power amplifying device 20 outputs again, first computing module 304 by playback equipment 30 calculates audio digital signals in real time with respect to the real-time time delay of video signal and store again, calculate the mean value of real-time time delay again by second computing module 305 of playback equipment 30, judge that by the judge module 306 of playback equipment 30 whether the absolute value of the mean value that calculates is greater than threshold value again, revise and preserve video time delay or audio frequency time delay by the modified module 307 of playback equipment 30 according to the judged result of judge module 306 at last, realize the automatic adjusting of audio-visual synchronization, simplified debug process, improve debugging efficiency and reduced the debugging error.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (10)
1. a method of regulating audio-visual synchronization automatically is characterized in that, comprises the steps:
The output test signal, described test signal comprises the sound signal of periodic vision signal and same period;
Delay when described vision signal is applied video and export display device to, and delay when described sound signal applied audio frequency and export power amplifying device to;
Light when gathering described display device display frame is to generate video pulse signal;
Described video pulse signal is converted to video signal and the audio pulse of described power amplifying device output is converted to audio digital signals;
Calculate in real time described audio digital signals with respect to the real-time time delay of described video signal and store;
Calculate the mean value of described real-time time delay;
Whether the absolute value of judging described mean value is greater than threshold value;
Revise and preserve described video time delay or described audio frequency time delay according to judged result.
2. the method for automatic adjusting audio-visual synchronization as claimed in claim 1 is characterized in that, described " revising and preserve described video time delay or described audio frequency time delay according to judged result " is specially:
When the absolute value of described mean value during greater than threshold value, judge whether described mean value is negative, if, then calculate described mean value and deduct the difference of described video time delay and revise described video time delay the absolute value that is described difference, otherwise, then calculate described mean value add the above audio frequency time delay and and revise described audio frequency time delay be described and.
3. the method for automatic adjusting audio-visual synchronization as claimed in claim 1 is characterized in that, also comprises:
Described video time delay and described audio frequency time delay are set.
4. the method for automatic adjusting audio-visual synchronization as claimed in claim 1 is characterized in that, comprises that also according to judged result described mean value being sent to described display device shows.
5. as the method for any described automatic adjusting audio-visual synchronization of claim 1 to 4, it is characterized in that described vision signal is rendered as the periodically bright video pictures that secretly replaces, described sound signal is rendered as periodic silence and the sound alternately that yowls.
6. a system that automatically regulates audio-visual synchronization is characterized in that, the light when comprising display device, power amplifying device and gathering described display device display frame is to generate the optical sensor of video pulse signal, and described playback equipment specifically comprises:
The audio frequency and video output module, be used to export test signal, described test signal comprises the sound signal of periodic vision signal and same period, delays when described vision signal applies video and exports display device to, delays when described sound signal applies audio frequency and exports power amplifying device to;
Signal processing module is used for the described video pulse signal that described optical sensor generates is converted to video signal and the audio pulse of described power amplifying device output is converted to audio digital signals;
First computing module is used for calculating in real time described audio digital signals with respect to the real-time time delay of described video signal and store;
Second computing module is used to calculate the mean value of described real-time time delay;
Judge module, whether the absolute value of the described mean value that is used to judge that described second computing module obtains is greater than threshold value;
Modified module is used for revising and preserve described video time delay or described audio frequency time delay according to judged result.
7. the system of automatic adjusting audio-visual synchronization as claimed in claim 6 is characterized in that, described modified module specifically comprises:
Judging unit is when being used for absolute value when described mean value greater than threshold value, judge whether described mean value is negative;
First revises the unit, is used for calculating described mean value according to the judged result of described judging unit and deducts the difference of described video time delay and revise described video time delay the absolute value that is described difference;
Second revises the unit, be used for according to the judged result of described judging unit calculate described mean value add the above audio frequency time delay and and revise described audio frequency time delay be described and.
8. the system of automatic adjusting audio-visual synchronization as claimed in claim 6 is characterized in that, described playback equipment also comprises:
Module is set, is used to be provided with described video time delay and described audio frequency time delay.
9. the system of automatic adjusting audio-visual synchronization as claimed in claim 6 is characterized in that, described playback equipment also comprises:
Sending module is used for judged result according to described judge module and described mean value is sent to described display device shows.
10. as the system of any described automatic adjusting audio-visual synchronization of claim 6 to 9, it is characterized in that, the described vision signal of described audio frequency and video output module output is rendered as the periodically bright video pictures that secretly replaces, and described sound signal is rendered as periodic silence and the sound alternately that yowls.
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Application publication date: 20130724 |