Audio File Recovery Unit for Lip Synchronization
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Solution Overview
Problem
Audio files become corrupted and unsynchronized with video when recorded at different speed rates using slow and fast functions, leading to lip desynchronization during playback, especially when the recording medium is removed during audio recording.
Innovation Solution
An audio processing apparatus that includes an audio file recovery unit, which calculates and adjusts the end position of audio data to coincide with the end position of video data by determining the padding or truncation size needed to synchronize the playback speed rates, ensuring lip synchronization even when audio and video are recorded at different speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If audio and video are recorded at different speed rates using slow and fast functions, then slow motion or fast motion effects are achieved, but audio and video become desynchronized during playback
Solution Approach 1:
The patent changes the time scale parameter of audio data during playback to match the playback speed rate of video data. When video is played back at a speed rate different from 1.0 (e.g., slow motion or fast motion), the audio playback time scale is adjusted proportionally to maintain synchronization between audio and video
Solution Approach 2:
The patent dynamically adjusts the audio playback speed based on the video playback speed rate. The audio reproduction device receives control signals that modify the audio playback characteristics in real-time according to the video playback conditions, enabling adaptive synchronization
2Reliability
If the recording medium is removed during audio recording, then recording interruption is detected, but the audio file becomes corrupted and unsynchronized with video
Solution Approach 1:
The patent performs preliminary actions by detecting recording interruptions and calculating the valid data length before attempting recovery. The system identifies the point where recording was interrupted and prepares recovery parameters in advance, preventing complete data loss
Solution Approach 2:
The patent converts the harmful effect of recording interruption into a beneficial recovery process. By detecting the interruption and calculating the valid data length, the system can recover the audio file by adjusting playback parameters to match the actual recorded duration, transforming a corrupted file into a usable one
3Reliability
If audio data is insufficient relative to video data after recovery, then the audio file can be recovered, but lip synchronization fails during playback
Solution Approach 1:
The patent changes the audio playback time scale parameter to match the video playback speed rate. By adjusting this parameter, the system ensures that even with insufficient audio data, the playback duration and timing align with the video, maintaining lip synchronization
Solution Approach 2:
The patent uses feedback from the video playback parameters to adjust audio playback. The system continuously monitors the video playback speed rate and adjusts the audio time scale accordingly, ensuring synchronization is maintained throughout playback
Data Source
AI summary
An audio processing apparatus includes an audio file recovery unit configured to recover an audio file related to a video file. With video data of the video file and audio data of the audio file recorded at different speed rates from each other, the audio file recovery unit recovers the audio file so that an end position of the audio data coincides with an end position of the video data in playback of the audio data and the video data at a speed rate.