Mobile Phone Audio Video Synchronization Controller
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mobile phone terminals face synchronization issues between audio and moving picture processing units controlled by different CPUs, leading to potential desynchronization due to transmission time delays and processing speed differences, especially when external processors are connected, affecting real-time synchronization in wireless environments.
Innovation Solution
A mobile phone terminal with a synchronization controller that calculates transmission time and compensates for synchronization errors between sound and moving picture processing units, using counters to adjust processing speeds and ensure synchronized playback even with different controllers, allowing for intermittent synchronization and external device connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common CPU controls both audio and moving picture processing, then synchronization between audio and video is maintained, but the CPU becomes overloaded and processing efficiency decreases
Solution Approach 1:
The patent divides the single CPU control function into separate audio processing controller and moving picture processing controller. Each controller independently manages its respective processing tasks, eliminating the overload on a single CPU while maintaining synchronization through coordinated control between the two separate controllers.
2Productivity
If separate CPUs control audio and moving picture processing, then CPU load is reduced and processing efficiency improves, but synchronization between audio and video deteriorates due to transmission time delays
Solution Approach 1:
The patent implements preliminary timing adjustment where the moving picture processing controller compensates for transmission time delays by adjusting the start timing of video processing based on the audio processing timeline. This preliminary action ensures that despite separate CPU control, the audio and video remain synchronized throughout processing.
3Adaptability or versatility
If external audio processing blocks are connected to the mobile terminal, then audio processing capability is enhanced, but synchronization control becomes more complex and difficult to maintain
Solution Approach 1:
The patent implements a feedback mechanism where the audio processing controller and moving picture processing controller continuously monitor and adjust their processing timelines based on actual transmission times and processing speeds. This feedback loop maintains synchronization even when external audio processing blocks are connected, managing the increased complexity through adaptive control.
Data Source
AI summary
In a mobile phone terminal, in which a sound, such as the audio, may be synchronized with a moving picture even in case a sound processor unit processing the sound, such as audio, is controlled by a controller differing from the controller controlling a moving picture processing unit processing the moving picture, there is provided a synchronization controller which calculates the transmission time of a signal transmitted between an audio processing CPU and a moving picture processing CPU, transmits an audio processing start signal, commanding the start of the audio processing, to the audio processing CPU through the moving picture processing CPU, and transmits, at a timing when the previously calculated transmission time has elapsed as from the transmission of the sound processing start signal, a moving picture processing start command signal, commanding the start of the moving picture processing, to the moving picture processing CPU.