Bluetooth LE Audio Snoop Links for Stereo Earbud Signal Recovery
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Solution Overview
Problem
Bluetooth LE Audio systems in true wireless stereo earbuds typically establish only a single LE isochronous link per earbud, limiting stereo audio capabilities and signal quality, leading to degraded user experience due to low signal quality on one earbud.
Innovation Solution
Establishing snoop links between audio sink devices to snoop audio packets from each other's LE ISO links, allowing stereo audio processing and packet loss recovery through ISO timing-based relay links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single LE ISO link is established per earbud, then power consumption and latency are improved, but stereo audio capability and signal quality are degraded
Solution Approach 1:
The audio receiving function is segmented into two paths: the primary LE ISO link for mono audio and the snoop link for stereo audio. This segmentation allows each link to have specialized functions, enabling stereo capability without requiring both earbuds to establish full LE ISO links, thus balancing power consumption with audio capability.
Solution Approach 2:
One earbud acts as an intermediary by establishing a snoop link to receive stereo audio packets from the audio source device. This intermediary earbud then relays the stereo audio to the other earbud, enabling stereo capability for both earbuds without requiring both to establish independent LE ISO links.
2Device complexity
If a single LE ISO link is established per earbud, then device complexity is reduced, but signal quality and audio performance are degraded
Solution Approach 1:
The snoop link serves multiple functions: it provides stereo audio transmission, enables packet loss recovery through redundancy, and allows one earbud to act as a relay for the other. This multi-functionality improves signal quality and reliability without requiring separate dedicated links for each function, thus avoiding increased complexity.
Solution Approach 2:
The system preliminarily establishes the snoop link configuration during the connection setup phase, determining which earbud will act as the snoop earbud and configuring the relay path in advance. This preliminary action simplifies the operational complexity during audio playback while ensuring signal quality through pre-configured redundant paths.
3Ease of operation
If independent LE ISO links are used for each earbud, then connection simplicity is improved, but stereo audio processing capability is degraded
Solution Approach 1:
The system adds another dimension to the audio transmission architecture by introducing the snoop link as a secondary path alongside the primary LE ISO link. This dimensional addition enables stereo audio processing capability without complicating the primary connection establishment, as the snoop link is configured automatically by the system after the main connection is made.
Data Source
AI summary
A wireless audio system supports Bluetooth Low Energy (LE) Audio, and includes a first audio sink device and a second audio sink device. The first audio sink device establishes a first LE isochronous (ISO) link between the first audio sink device and an audio source device. The second audio sink device establishes a second LE ISO link between the second audio sink device and the audio source device. In addition, the first audio sink device sets up a first snoop link that snoops audio packets transmitted over the second LE ISO link, and the second audio sink device sets up a second snoop link that snoops audio packets transmitted over the first LE ISO link.