Multimedia Control Circuit Buffering for Frame Synchronization
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Solution Overview
Problem
Conventional multimedia devices with timeshift functions often result in a black screen during playback resume due to 'lost frames' caused by storing undecoded multimedia data only after receiving a pause signal, leading to a discrepancy between the displayed and stored frames.
Innovation Solution
A control method and circuit for multimedia devices that buffer multimedia data before a pause signal is received, allowing prerecording and seamless playback resume by writing and reading multimedia data between a buffer and storage unit, respectively, and decoding operations are suspended and resumed accordingly to maintain frame synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the multimedia device stores undecoded multimedia data only after receiving a pause signal, then the storage operation is simple and fast, but frame synchronization is lost causing black screen during playback resume
Solution Approach 1:
The patent applies preliminary action by buffering multimedia data in advance before the pause signal is received. The control circuit buffers a predetermined amount of multimedia data in the buffer memory unit prior to pausing, so that when playback resumes, synchronized frames are already prepared and available, preventing the black screen issue while maintaining relatively simple processing logic.
2Reliability
If the multimedia device buffers a large amount of multimedia data before pause, then frame synchronization is maintained, but the buffer memory requirement increases
Solution Approach 1:
The patent applies partial action by buffering only a predetermined, limited amount of multimedia data before pause rather than buffering all possible data. This predetermined amount is sufficient to maintain frame synchronization for the pause duration while avoiding excessive buffer memory requirements, achieving an optimal balance between synchronization reliability and memory consumption.
Data Source
AI summary
A data processing method of a multimedia device is disclosed. The multimedia device pauses playback of multimedia data in response to a pause signal. The method includes: buffering the multimedia data before the pause signal is received to obtain prerecorded multimedia data; writing the prerecorded multimedia data into a storage unit in response to the pause signal; reading the prerecorded multimedia data from the storage unit in response to a playback signal; and playing the prerecorded multimedia data.