Audio-Video Sync Detection Using Delay Circuit and Optical Sensor
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Solution Overview
Problem
Conventional audio-video synchronization detection devices fail to accurately detect synchronization quality due to ignoring signal delays during transmission and processing, resulting in asynchronous audio and video experienced by consumers.
Innovation Solution
An audio-video synchronization detection device and method that simulates delay errors by using a delay circuit to adjust the audio signal and an optical sensor to sense the display panel's light, calculating the delay time between the adjusted audio and image signals to reflect the actual consumer experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional audio-video synchronization detection device directly measures the difference between image signal and audio signal output by audio-video processing unit, then the detection process is simple, but the detection result does not reflect actual consumer experience due to ignoring transmission and processing delays
Solution Approach 1:
The delay circuit introduces predetermined delays to the audio signal in advance, simulating the transmission and processing delays that occur in real consumer environments. This preliminary action allows the detection device to account for delay errors before performing the synchronization measurement, thereby improving measurement precision without requiring complex post-processing corrections
Solution Approach 2:
The patent introduces an optical sensor as an intermediary to convert the image signal into an electrical signal that can be directly compared with the audio signal. This intermediary component enables accurate synchronization detection by mediating between the visual display and audio output, allowing the system to measure actual consumer experience while maintaining relatively simple device structure
2Device complexity
If signal delays during transmission and processing are ignored, then the detection device structure remains simple, but the detection result becomes inaccurate and does not match actual consumer experience
Solution Approach 1:
The delay circuit introduces predetermined delays to the audio signal in advance, simulating the transmission and processing delays that occur in real consumer environments. This preliminary action allows the detection device to account for delay errors before performing the synchronization measurement, thereby improving measurement precision without requiring complex post-processing corrections
Solution Approach 2:
The patent changes the timing parameters of the audio signal by introducing deliberate delays through the delay circuit. This parameter modification allows the system to simulate real-world transmission and processing conditions, enabling accurate synchronization detection that reflects actual consumer experience while maintaining a relatively simple device structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for proper detection of audio-video synchronization quality, ensuring that the audio-video service provided is synchronized and enjoyable for consumers by accounting for transmission delays.
Implementation Method 1
The optical sensor senses a light emitted by a display panel when the display panel displays the image signal and generates an image sensing signal accordingly
Data Source
AI summary
An audio-video synchronization detection device and a method thereof are provided. The audio-video synchronization detection device detects an object under test which is capable of generating an image signal and an audio signal. The audio-video synchronization detection device includes a delay circuit, an optical sensor, and a signal processor. The delay circuit delays the audio signal for a predetermined time and generates an audio correction signal accordingly. The optical sensor senses a light emitted by a display panel when the display panel displays the image signal and generates an image sensing signal accordingly. The signal processor calculates a delay time between the audio correction signal and the image sensing signal to obtain a synchronization state between the image signal and the audio signal.