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The AV-sync delay is normally fixed. External AV-sync errors can occur if a microphone is placed far away from the sound source, the audio will be out of sync because the speed of sound is much lower than the speed of light. If the sound source is 340 meters from the microphone, then the sound arrives approximately 1 second later than the light.
To correct audio video sync problems, the video processing circuitry outputs a DDO (digital delay output) signal, which carries information about the amount of delay the video signal experiences due to the video processing. The DDO may, for example, be provided by equipment which adheres to the SMPTE [3] Audio to Video Synchronization Standard ...
A cable conducts the sync pulse from camera to sound recorder. The sync pulse is typically a sine wave of 50 or 60 Hz with an RMS amplitude of approximately 1 volt. [4] This double-system audio recording could then be transferred or "resolved" to sprocketed magnetic film, with sprocket holes that match one to one with the original camera film.
Tight sync between multiple AV streams is needed for lip sync between video and related audio streams, to keep multiple digitally connected speakers in phase in a professional environment (which requires 1 μs precision), and to prevent audio or video packets from arriving late to the endpoint, resulting in a dropped frame of video and unwanted ...
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Synchronization is important in digital telephony, video and digital audio where streams of sampled data are manipulated. Synchronization of image and sound was an important technical problem in sound film. More sophisticated film, video, and audio applications use time code to synchronize audio and video. [2]
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