Amplifier Audio Delay Compensation for Video Display Latency
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Solution Overview
Problem
The synchronization between video and audio signals is disrupted due to significant display delay times in large-sized display devices, which existing technologies fail to automatically correct, leading to desynchronization during reproduction.
Innovation Solution
An amplifier system that includes a test video signal generator, a sensing mechanism to measure display delay times, and a controlling unit to adjust the audio signal reproduction based on the sensed delay, ensuring synchronization by calculating and setting the appropriate audio delay time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If large-sized display devices (PDP, DLP) are used to achieve high-definition television broadcasts and home theater systems, then display quality is improved, but display delay time increases causing video-audio desynchronization
Solution Approach 1:
The system performs preliminary measurement of display delay time by inputting a test video signal and measuring the time from signal input to actual display. Based on this pre-measured delay time, the audio signal is preliminarily delayed before reproduction, ensuring synchronization is established in advance rather than reacting after desynchronization occurs.
Solution Approach 2:
The system continuously monitors the display delay time by comparing the input test video signal timing with the actual display timing. This feedback mechanism allows the system to automatically adjust the audio delay time based on the measured video delay, maintaining synchronization without manual intervention.
2Reliability
If automatic measurement and correction of display delay time is implemented, then video-audio synchronization is improved, but device complexity increases
Solution Approach 1:
The amplifier automatically performs the entire process of measuring display delay time, calculating the required audio delay, and adjusting the audio reproduction timing without user intervention. The system serves itself by autonomously detecting synchronization issues and correcting them, eliminating the need for manual calibration or complex external measurement equipment.
Solution Approach 2:
The measurement and correction functions are merged into the amplifier's existing audio processing architecture. The test video signal processing, delay measurement, and audio delay control are integrated within a single device, avoiding the need for separate external measurement and correction equipment.
3Reliability
If audio signal is delayed to compensate for video delay, then synchronization is improved, but audio processing complexity increases
Solution Approach 1:
The audio delay time is calculated in advance based on the measured video display delay time. The amplifier applies this pre-calculated delay to the audio signal before reproduction, allowing the audio processing to proceed with a known, fixed delay parameter rather than requiring complex real-time adjustment mechanisms.
Data Source
AI summary
There is provided an amplifier that measures a display delay time caused until a video is displayed actually after a video signal is generated, and sets automatically a delay time of an audio signal such that an audio synchronizes with this display. Test video data is stored in a memory 11. This test video data is video data that generates a clear change in luminance in such a manner that a screen is changed suddenly from deep black to pure white. This test video is output to a video display device 2 such as PDP, for example, and a delay time generated until the test video is displayed actually after this test video is output is measured. Since the luminance of the screen is changed suddenly when the test video is displayed actually, this change can be sensed by an optical sensor 20. The audio signal is delayed by setting this delay time in an audio signal processing portion 13, so that the video can synchronize with the audio.