Audio Timestamp Correction for Zoom-Induced Video Asynchronization
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Solution Overview
Problem
During video recording, especially at high zoom ratios, audio-visual asynchronization occurs due to sound propagation latency, leading to a more severe issue as the zoom ratio increases, causing a mismatch between audio and video timestamps.
Innovation Solution
An electronic device corrects the audio timestamp based on the latency, including sound propagation latency and algorithm processing latency, to synchronize audio and video by calculating the timestamp using the formula: audio timestamp = N × reading period - latency, where N is the reading period and latency includes sound propagation and processing delays, ensuring accurate alignment with the video recording start time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the zoom ratio is increased to capture distant objects, then the photographing capability is improved, but the audio-visual asynchronization becomes more severe
Solution Approach 1:
The patent calculates and applies audio timestamp correction in advance during the video recording process. By pre-calculating the correction amount based on the zoom ratio and applying it before audio-visual asynchronization occurs, the system maintains synchronization without requiring post-processing adjustments.
Solution Approach 2:
The patent dynamically adjusts the audio timestamp parameter based on the zoom ratio. When the zoom ratio changes, the system recalculates the timestamp correction amount and applies it to the audio track, ensuring that the audio remains synchronized with the video frames despite the changing optical parameters.
2Measurement precision
If the zoom ratio is increased, then the captured detail of distant objects is improved, but the sound propagation latency becomes more significant
Solution Approach 1:
The patent extracts and isolates the latency compensation function from the general video processing pipeline. By separately calculating and applying timestamp correction specifically to the audio track based on the zoom ratio, the system addresses the time loss issue without affecting the image quality or other video processing operations.
3Device complexity
If the audio timestamp is not corrected, then the processing complexity is reduced, but the audio-visual synchronization accuracy deteriorates
Solution Approach 1:
The patent introduces an intermediary correction mechanism that sits between the audio capture and final output. By calculating a correction amount based on the zoom ratio and applying it as a timestamp adjustment, the system achieves precise synchronization without requiring complex real-time audio processing or multiple processing stages.
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
This method effectively reduces errors in audio timestamps, ensuring that audio and video are synchronized, even at high zoom ratios, by accounting for both sound propagation and processing latencies, thereby improving user experience by maintaining synchronized playback.
Implementation Method 1
the first latency includes a first sound propagation latency, and the first sound propagation latency is a latency caused when the sound emitted by the sound source is transmitted from the sound source to an electronic device
Data Source
AI summary
A first audio timestamp of first audio is corrected based on a first latency corresponding to the first audio, to correct a correspondence between the first audio timestamp, the first audio, and a first image. In this way, a stored correspondence between the first image and the first audio is consistent with a correspondence between a picture corresponding to the first image and a sound corresponding to the first audio, thereby implementing audio and image synchronization.