Drive Video Recorder Audio-Video Sync Performance Evaluation
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Solution Overview
Problem
Existing driving video recording systems (DVRS) lack consistent and objective performance evaluation for sound recording functions, particularly in terms of synchronization and volume, leading to inconsistent and unreliable performance across different models and manufacturers.
Innovation Solution
A method and apparatus for evaluating DVRS performance by quantifying sound recording performance using pre-designated criteria, including time synchronization and volume evaluation through analysis of video and sound signals with predefined markers and digital sound pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If qualitative performance evaluation is conducted according to subjective criteria of an evaluator, then the evaluation process is simple and easy to perform, but the evaluation results are inconsistent and unreliable
Solution Approach 1:
The patent replaces the mechanical system of subjective human evaluation with an automated objective evaluation system that uses digital signal processing. The control device automatically extracts video frames, identifies markers, extracts sound signals, calculates time differences, and evaluates synchronization performance without human intervention, thereby eliminating subjectivity while maintaining ease of operation.
Solution Approach 2:
The evaluation system performs self-service by automatically conducting the entire evaluation process without requiring evaluator expertise or subjective judgment. The system extracts necessary data, processes signals, calculates performance metrics, and generates evaluation results autonomously, making the process both simple to operate and reliably consistent.
2Device complexity
If sound recording performance is evaluated without quantitative criteria, then the evaluation process is simple, but uniform performance cannot be ensured across different models and manufacturers
Solution Approach 1:
The patent introduces specific quantitative parameters for evaluating sound recording performance, including time difference (for synchronization) and digital sound pressure level (for volume). These standardized parameters enable consistent, objective comparison across different DVRS models and manufacturers, ensuring uniform performance without significantly increasing system complexity.
3Productivity
If end-to-end latency verification is not performed after encoding, then the development process is faster and more efficient, but sound recording performance cannot be properly evaluated
Solution Approach 1:
The patent implements preliminary action by automatically performing end-to-end latency verification as part of the development and manufacturing process. The control device extracts video frames containing markers, extracts corresponding sound signals, calculates time differences, and evaluates synchronization performance automatically, ensuring precise measurement without significantly impacting development efficiency.
Data Source
AI summary
A method for evaluating performance of a driving video recording system may include extracting, by a control device, a plurality of video frames from a video file, identifying, by the control device, a time interval associated with at least one video frame that comprises a marker among the plurality of video frames and identifying a first time point, of the time interval, corresponding to the at least one video frame, identifying, by the control device and from the video file, a sound signal corresponding to the at least one video frame to identify a second time point, of the time interval, associated with the sound signal corresponding to the at least one video frame, and outputting, by the control device and based on a time difference between the first time point and the second time point, a result associated with a time synchronization performance of the driving video recording system.