Delay matching in audio/video systems
AssigneeSony Computer Entertainment America LLC
InventorDominic Saul Mallinson
Life of this patent
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Abstract
An audio/video system comprises an audio signal processing path having an audio path delay and a video signal processing path having a video path delay. The audio path delay may be different from the video path delay. The audio path delay and/or the video path delay may change, for example because of replacement of a component within the audio signal processing path or the video signal processing path. Delay matching (synchronization) in the audio/video system comprises adjusting the audio path delay to be substantially equal to the video path delay. Matching the audio path delay to the video path delay generally includes adding delay to the signal processing path with the lesser delay.
Claims21
An audio/video signal processing system, the system comprising:
- an audio signal processing path that generates an audio stimulus;
- a video signal processing path that generates a video stimulus;
- a sensor that detects a difference between an audio path delay of the audio signal processing path based on the audio stimulus and a video path delay of the video signal processing path based on the video stimulus, the audio path delay including a delay associated with an audio speaker and the video path delay including a delay associated with a video display;
- and
- a delay generator that adjusts the audio path delay to be substantially equal to the video path delay.
A method for audio/video signal processing, the method comprising:
- generating an audio stimulus in an audio signal processing path, the audio stimulus including an output of an audio speaker;
- generating a video stimulus in a video signal processing path, the video stimulus including an output of a video display;
- detecting the audio stimulus after an output of the audio signal processing path;
- detecting the video stimulus after an output of the video signal processing path;
- measuring a time offset between the detected audio stimulus and the detected video stimulus;
- and
- determining a calibration value that substantially cancels the measured time offset.
A system comprising:
- an audio signal processing path with an audio path delay;
- a video signal processing path with a video path delay;
- and
- a delay generator that matches the audio path delay to the video path delay based at least in part on a detected audio path delay and a detected video path delay, the detected audio path delay including a delay associated with an audio speaker and the detected video path delay including a delay associated with a video display.
Dependencies are inferred from the claim text.