Audio Video Delay Matching Using Sensor Feedback
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Solution Overview
Problem
Home theater systems often experience differing delays between audio and video signal processing paths, leading to synchronization issues where audio and video content become out of sync, causing viewer distraction and dissatisfaction.
Innovation Solution
A system comprising an audio signal processing path, a video signal processing path, a sensor, and a delay generator that detects and adjusts delays to synchronize the audio and video paths, using sensors like audio/video cameras and microphones to measure time offsets and apply calibration values to equalize delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If digital HDTV is used instead of analog TV, then video quality is improved, but video path delay increases significantly
Solution Approach 1:
The system performs preliminary delay measurement using audio/video stimuli and sensors to detect the time offset between audio and video paths before content playback, then pre-calculates and applies the appropriate delay compensation value to synchronize the paths in advance
2Adaptability or versatility
If different audio/video components are substituted to improve system performance, then system capability is improved, but delay synchronization becomes more difficult
Solution Approach 1:
The system uses sensors to detect the actual delay in the video path, compares it with the audio path delay, and automatically adjusts the delay compensation value based on the measured time offset, creating a closed-loop feedback system that maintains synchronization regardless of component changes
Solution Approach 2:
The system dynamically changes the delay parameter in the video or audio path based on the detected time offset, allowing the system to adapt to different components and conditions by adjusting the delay compensation value rather than relying on fixed component characteristics
3Device complexity
If manual delay adjustment is used, then device complexity is reduced, but time offset detection precision is insufficient
Solution Approach 1:
The system uses readily available consumer electronics components (TV speakers, display screen, remote control with sensors) to perform self-diagnosis and self-adjustment of delay synchronization, eliminating the need for specialized measurement equipment or complex manual calibration procedures
Data Source
AI summary
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.