Bluetooth Audio Transmitter Synchronization Bus for Collision Avoidance
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Solution Overview
Problem
In multiple speaker audio systems, using Bluetooth LE Audio with two transmitters can lead to collisions and reduced link robustness due to unsynchronized frequency usage, especially in home theater installations with 7.1 or 7.2 channels, which affects audio quality and reliability.
Innovation Solution
Implement a synchronization bus between Bluetooth audio transmitters to coordinate frequency and timing, ensuring non-overlapping channel maps and synchronized hopping sequences to minimize collisions and maximize available radio channels for simultaneous audio streaming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two Bluetooth audio transmitters operate simultaneously without synchronization, then multiple audio streams can be transmitted, but radio channel collisions occur and link robustness decreases
Solution Approach 1:
The radio channel spectrum is segmented into distinct frequency bands, with each transmitter assigned to specific non-overlapping bands. This segmentation prevents collisions by ensuring that simultaneous transmissions occur on different frequencies, thereby maintaining both high transmission capacity and link robustness
Solution Approach 2:
The system dynamically synchronizes frequency hopping sequences between transmitters based on a shared timing reference. This dynamic coordination allows transmitters to adapt their frequency usage in real-time while maintaining non-overlapping channels, resolving the contradiction between simultaneous transmission and collision avoidance
2Reliability
If transmitters use frequency hopping for robustness, then link reliability improves, but synchronized hopping requires complex coordination
Solution Approach 1:
A shared timing reference acts as an intermediary that coordinates frequency hopping between transmitters. This mediator enables synchronized hopping sequences without requiring complex peer-to-peer coordination, as each transmitter independently aligns its hopping to the common reference, simplifying the overall system complexity while maintaining robustness
Data Source
AI summary
A method and apparatus are described for synchronization between Bluetooth audio transmitters. In one example, an audio source includes a synchronization bus. A first audio transmitter is coupled to the audio source and to the synchronization bus. The first audio transmitter is configured to assess available radio channels, select a set of radio channels, send transmit commands to a second audio transmitter through the synchronization bus, and to transmit a first set of audio streams from the audio source to a first set of one or more audio sinks using the selected radio channels. The second audio transmitter is configured to receive the transmit commands from the first audio transmitter through the synchronization bus and to transmit a second set of audio streams from the audio source to a second set of one or more audio sinks in accordance with the transmit commands.