Document Camera Audio-Video Synchronization Mode Switch
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Solution Overview
Problem
Existing document camera systems with integrated audio and video output suffer from significant delays in audio signal output during sound reinforcement, making them impractical for real-time applications.
Innovation Solution
A document camera system with a video signal acquisition unit, an audio signal acquisition unit, a time stamp adding unit, a mode switching unit, and a sound reinforcement instruction unit that allows asynchronous output of video and audio signals when in sound reinforcement mode, ignoring the time stamp, thereby preventing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the projector synchronizes the video signal with the audio signal based on the time stamp, then the video and audio signals are synchronized, but the audio signal is outputted with an extremely large delay from the time point of audio acquisition
Solution Approach 1:
The system dynamically switches between two operational modes: recording mode (using time stamp synchronization) and sound reinforcement mode (ignoring time stamp synchronization). This dynamic adaptation allows the system to optimize performance based on the specific application requirements, resolving the contradiction between synchronization stability and audio output delay.
Solution Approach 2:
The invention changes the synchronization parameter state by introducing a mode switching mechanism. In recording mode, time stamp synchronization is enabled; in sound reinforcement mode, time stamp synchronization is disabled. This parameter change allows the system to avoid audio delay in real-time applications while maintaining synchronization capability when needed.
2Ease of operation
If the document camera and projector are directly connected via USB interface without a computer, then the system is easy to operate, but the audio signal processing capability is limited
Solution Approach 1:
The projector is designed to perform multiple functions: it acts as both a simple display device (when connected directly to document camera) and an audio processing device (when receiving audio signals for sound reinforcement). This multi-functionality allows the system to maintain ease of operation while enhancing audio processing capability through the projector's built-in speaker and processing unit.
Data Source
AI summary
A document camera includes: a camera unit which acquires a video signal; a microphone unit which acquires an audio signal; a stamp adding unit which adds a time stamp for synchronizing the video signal and the audio signal with each other to the video signal and the audio signal that are acquired; a mode switching button which switches between a “video recording mode” and a “sound reinforcement mode”; a video recording unit which records the video signal and the audio signal together with the time stamp if the “video recording mode” is switched on; and a sound reinforcement instruction unit which instructs a projector to output the video signal and the audio signal, ignoring the time stamp, if the “sound reinforcement mode” is switched on.