Wireless Audio Latency Reduction via Rate Matching
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Solution Overview
Problem
Conventional wireless communication systems experience high audio latency due to rate mismatch and frame alignment issues, particularly in wideband audio transmissions, which degrade audio quality and increase perceptible pauses during communication.
Innovation Solution
Implementing rate matching and frame alignment techniques on either the Bluetooth controller or host unit, using methods such as sample rate conversion, packet length synchronization, and byte stuffing, to compensate for clock domain mismatches and align frames with transmission packets, thereby reducing latency without significantly impacting audio quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wideband audio is used to increase audio fidelity, then audio quality is improved, but audio latency increases due to increased bandwidth requirements and encoding/decoding processing time
Solution Approach 1:
The patent merges the audio codec and rate adapter functions into the Bluetooth controller, eliminating the need for separate processing devices. This integration reduces the number of interface effects and processing stages, thereby reducing audio latency while maintaining wideband audio fidelity through combined encoding and rate matching operations
Solution Approach 2:
The system performs rate matching and frame alignment operations in advance during the encoding process. By pre-adjusting the audio data rate and aligning frames with transmission packets before transmission, the system eliminates subsequent processing delays and reduces overall audio latency while preserving audio quality
2Loss of time
If rate matching and frame alignment are performed to reduce audio latency, then communication interactivity is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent combines multiple functions (audio codec, rate adapter, frame alignment) into a single integrated processing unit within the Bluetooth controller. This merging reduces device complexity by eliminating separate processing stages and interfaces, while still achieving low latency through coordinated operation of the integrated components
Solution Approach 2:
The Bluetooth controller is designed to perform multiple functions including audio encoding, rate matching, and frame alignment within a single device. This multi-functionality reduces the need for separate dedicated processing devices, thereby reducing overall system complexity while maintaining the ability to reduce audio latency through comprehensive processing capabilities
Data Source
AI summary
Provided are systems and methods for providing reduced audio latency in wireless communications. One electronic system providing reduced audio latency includes a host unit for converting audio data, a digital interface coupling the host unit and a wireless transceiver, where the wireless transceiver has a controller including a rate adapter, and where the controller is configured to monitor a rate mismatch between the host unit and the wireless transceiver and to compensate for the rate mismatch using the rate adapter, thereby reducing the audio latency. One controller includes an audio codec for encoding and decoding the audio data, where the controller is further configured to align a frame of encoded audio data and a transmission packet of the wireless transceiver, thereby further reducing the audio latency.