Imaging Device Audio-Video Synchronization via Real-Time Multiplexing
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Solution Overview
Problem
Conventional imaging devices require an editing step to replace audio data with predetermined audio in moving image files, which is inefficient.
Innovation Solution
An imaging device that synchronizes audio and moving image data by multiplexing moving image coded data with first or second audio coded data, using a control unit to manage the reproduction position of audio data and integrate it with moving image data in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moving image capturing is performed while predetermined audio is reproduced, then the moving image can be captured in synchronization with audio, but audio data in the moving image file includes sound during capturing rather than the predetermined audio
Solution Approach 1:
The system calculates the reproduction position of predetermined audio data in advance before moving image capturing starts. This preliminary calculation allows the multiplexer to correctly associate the predetermined audio with the moving image coded data during multiplexing, ensuring that the final moving image file contains the intended audio rather than ambient sound.
2Productivity
If conventional imaging devices record audio during capturing, then the moving image file contains actual captured sound, but post-capture editing is required to replace audio with predetermined audio
Solution Approach 1:
The reproduction position of predetermined audio is calculated in advance before capturing begins. This preliminary action enables the system to directly multiplex the correct audio data with video data during capturing, eliminating the need for post-capture editing and saving time.
Solution Approach 2:
The imaging device automatically performs the audio replacement function that would otherwise require manual editing. By integrating the audio position calculation and multiplexing functions within the device, it serves itself to produce the final synchronized moving image file without external editing intervention.
3Reliability
If the multiplexer multiplexes moving image coded data with audio coded data using reproduction position information, then audio and video are synchronized in the moving image file, but the system complexity increases
Solution Approach 1:
The control unit integrates multiple functions including reproduction position calculation, audio decoding control, and multiplexing coordination into a single unified component. This merging of functions reduces overall system complexity compared to having separate dedicated units for each function while maintaining reliable audio-video synchronization.
Data Source
AI summary
In an imaging device or an imaging system, it becomes possible to generate a moving image file in which audio and a moving image are synchronized with each other even if moving image capturing is started from the middle of music. Upon receiving an operation input for audio reproduction execution, the imaging device causes an audio decoder to execute an operation, and outputs audio data to a speaker. At this time, a reproduction position in audio coded data is calculated, and reproduction position data is sent to a multiplexer. Upon receiving an operation input for moving image capturing execution, a moving image encoder and the multiplexer are caused to execute operations. The multiplexer multiplexes the reproduction position data to moving image coded data and the audio coded data, to generate a moving image file.