Dynamic Bit Rate Adjustment for Isochronous Wireless Audio
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Solution Overview
Problem
Wireless systems, such as multi-speaker systems, often use a fixed bit rate for data packets, leading to increased packet loss and decreased audio quality when devices move further apart or experience environmental interference, as existing solutions like packet-loss-concealment cannot reconstruct lost data effectively.
Innovation Solution
Implementing a dynamic codec module and source encoder in wireless devices to adjust the data rate, such as bit rate or sample rate, based on feedback from the wireless connection, reducing packet loss by decreasing packet size and utilizing unused air-time for additional data or retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed bit rate is used for data packets in wireless connections, then the system setup is simple and stable, but packet loss increases and audio quality degrades when devices move apart or experience environmental interference
Solution Approach 1:
The patent implements dynamic adjustment of bit rate and packet size based on real-time wireless connection quality monitoring. The system transitions from fixed parameters to dynamically adaptable parameters, allowing the audio device to adjust transmission characteristics in response to changing environmental conditions, device distance, and interference levels, thereby maintaining reliable audio transmission across varying connection qualities
Solution Approach 2:
The system changes key transmission parameters including bit rate, packet size, and sample rate based on monitored connection quality metrics. When packet loss exceeds thresholds or connection quality degrades, the system adjusts these parameters to optimize transmission reliability, directly addressing the contradiction between maintaining simple fixed-rate operation and adapting to varying wireless conditions
2Reliability
If packet-loss-concealment is used to handle lost data, then the system maintains operation during packet loss, but audio quality still degrades because lost data cannot be reconstructed
Solution Approach 1:
The system performs preliminary actions by proactively reducing packet size and bit rate before severe packet loss occurs, and by prioritizing which audio data to transmit based on importance. This preventive approach reduces the occurrence of packet loss and minimizes the impact when loss does occur, maintaining higher audio quality compared to reactive concealment methods
Solution Approach 2:
The system implements feedback mechanisms where the audio device monitors packet loss rates and connection quality, then uses this feedback to dynamically adjust transmission parameters. This closed-loop control allows the system to adapt to actual transmission conditions and maintain audio quality by adjusting bit rate and packet size based on real-time performance data
3Reliability
If the bit rate is decreased to reduce packet loss, then packet error rate decreases, but audio bandwidth and quality are reduced
Solution Approach 1:
The system dynamically adjusts bit rate based on actual connection quality rather than using a fixed low bit rate. When connection quality is good, the system maintains higher bit rates for superior audio bandwidth. When packet loss increases, the system temporarily reduces bit rate to improve reliability. This dynamic approach resolves the contradiction by allowing the system to operate at high quality when possible while maintaining reliability when necessary
Solution Approach 2:
The system uses partial action by selectively reducing bit rate and packet size only when and where necessary to achieve acceptable packet error rates. Rather than consistently operating at reduced quality, the system maintains full audio bandwidth and quality during good connection conditions, applying compression only partially when connection quality degrades
Data Source
AI summary
Methods and systems for dynamically adjusting a data rate in a wireless connection are provided. The systems include a source device and a sink device configured to establish a wireless connection. The quality of the wireless connection is monitored. Should the quality degrade so as to satisfy a triggering event, the source controller can adjust the data rate, e.g., the bit rate or sample rate, used to reduce the number of dropped, lost, or retransmitted packets. The reduction in bit rate and/or sample rate results in packets of decreased size and additional unused air-time. The unused air-time provided can be filled with at least a portion of a frame of data originally associated with another packet. This will result in at least one packet being free to include additional retransmission packets. Additionally, should the quality of the connection improve, the source controller can adjust increase the data rate accordingly.