Wireless Audio Transmission Compression Rate Control
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Solution Overview
Problem
Existing methods for wireless transmission of audio data, such as Bluetooth's A2DP, may experience delays due to communication quality deterioration or heavy processing loads, leading to issues like 'skipping' and noticeable differences in sound quality.
Innovation Solution
A transmission device that generates encoded data in fixed-size units, temporarily retains this data, and wirelessly transmits it, dynamically adjusting the compression rate based on the number of stored frames without estimating communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compression rate is increased to reduce data unit size when communication quality deteriorates, then transmission reliability is improved, but sound quality consistency deteriorates due to apparent differences in sound quality when unit size changes
Solution Approach 1:
The patent applies dynamics by making the compression rate adjustable based on transmission conditions. The compression rate determining unit dynamically selects from multiple predetermined compression rates (first, second, and third compression rates) depending on the number of stored frames, allowing the system to adapt to changing communication conditions while maintaining sound quality consistency through controlled transitions.
Solution Approach 2:
The patent changes the compression rate parameter based on the number of stored frames. When the number of stored frames exceeds a threshold, the system switches to a higher compression rate; when the threshold is not met, it uses a lower compression rate. This parameter change approach allows the system to optimize transmission reliability without causing apparent sound quality differences through gradual transitions.
2Reliability
If communication quality estimation is performed on the transmission device side to adjust compression rate, then transmission reliability is improved, but device complexity increases due to additional estimation mechanisms
Solution Approach 1:
The patent applies self-service by having the transmission device automatically determine the compression rate based on the number of stored frames without requiring external communication quality estimation. The compression rate determining unit independently selects the appropriate compression rate (first, second, or third) based on the frame count, eliminating the need for complex communication quality estimation mechanisms while maintaining transmission reliability.
3Adaptability or versatility
If the unit size of data transmission is greatly changed after switching, then transmission adaptability is improved, but sound quality consistency deteriorates due to apparent differences in sound quality
Solution Approach 1:
The patent applies dynamics by implementing flexible compression rate selection based on the number of stored frames. The system can dynamically switch between different compression rates (first, second, and third compression rates) to adapt to varying transmission conditions. This dynamic adjustment allows the system to maintain transmission adaptability while preventing apparent sound quality differences through controlled and gradual transitions between compression rates.
Data Source
AI summary
Techniques for wireless transmission of data are provided, in which data representing a plurality of frames of a time-sequential signal are encoded. The encoded data are temporarily retained in a memory buffer before wireless transmission. A current number of frames of the encoded data awaiting transmission is determined, and a compression rate is selected for encoding the next frame of data of the time-sequential signal based on the determined number of stored frames in the memory buffer. The selected compression rate is used to encode the next frame of the time-sequential signal, which is added to the encoded data stored in the memory buffer and wirelessly transmitted from the memory buffer. The present disclosure is applicable to a smartphone and a portable player, for example.