Dynamic Bit-Rate Adjustment for Bluetooth Headset Audio Glitches
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Solution Overview
Problem
Wireless headphones often experience audio glitches due to poor transmission conditions, which existing techniques like increasing transmission power and beamforming cannot fully address, especially in devices with limited capabilities and small form factors, and jitter buffers can only temporarily mitigate issues before data loss occurs.
Innovation Solution
Dynamically adjusting the bit-rate of encoded audio data based on buffer levels within the host device or accessory, reducing the bit-rate when buffer levels fall below a certain threshold to prevent data loss and maintain a stable playback buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased or beamforming is used to improve signal quality, then data transmission reliability is improved, but device complexity and limitation are worsened due to hardware constraints
Solution Approach 1:
The patent dynamically adjusts the audio bit-rate parameter based on buffer level monitoring to optimize transmission reliability without requiring complex hardware modifications. By changing the encoding parameter (bit-rate) rather than transmission power or beamforming configuration, the system achieves adaptive reliability improvement within existing hardware constraints.
2Reliability
If jitter buffer size is increased to provide larger playback cushion, then audio glitch resistance is improved, but data loss tolerance is worsened when buffer empties under persistent poor transmission conditions
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors buffer levels and dynamically adjusts the audio bit-rate in response to buffer depletion. This closed-loop control allows the system to detect when the buffer is running low and proactively reduce the bit-rate to prevent complete data loss, thereby maintaining audio playback reliability without requiring an excessively large buffer.
Solution Approach 2:
The patent makes the audio bit-rate dynamic rather than static, allowing it to change in real-time based on actual buffer conditions. This dynamic adjustment enables the system to adapt to varying transmission conditions and buffer levels, optimizing the balance between buffer size and data loss protection without committing to a fixed, potentially insufficient buffer configuration.
3Manufacturing precision
If fixed high bit-rate is used to maintain audio quality, then audio quality is improved, but transmission reliability under poor conditions is worsened due to data loss
Solution Approach 1:
The patent transitions from a fixed bit-rate approach to a dynamic bit-rate adjustment system that responds to buffer levels. When buffer levels are healthy, higher bit-rates maintain audio quality; when buffer levels drop indicating poor transmission conditions, the bit-rate is reduced to prevent data loss. This dynamic adaptation resolves the contradiction between maintaining high audio quality and ensuring transmission reliability.
Solution Approach 2:
The system uses buffer level monitoring as feedback to control bit-rate adjustment. This feedback loop allows the system to automatically reduce bit-rate when transmission conditions deteriorate and buffer levels fall, preventing data loss while maintaining audio quality as much as possible under varying conditions. The feedback mechanism ensures transmission reliability without sacrificing audio quality when conditions permit.
Data Source
AI summary
The present disclosure provides systems and methods for dynamically adjusting a bit-rate of encoded audio data. A buffer may receive audio data encoded at a first bit-rate. An audio data level corresponding to the amount of audio data stored within the buffer may be determined. The audio data level of the buffer may be determined to be within a buffer zone, and a bit-rate adjustment may be initiated after determining the audio data level is within a buffer zone.