BLE Audio Broadcast Switching Without Pairing Delays
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Solution Overview
Problem
Current wireless audio data connections, particularly in wearable devices, are time-consuming due to the need for handshakes and paired connections, especially when multiple source devices are available.
Innovation Solution
The implementation of Isochronous Broadcast Stream topology for wireless audio data transmission using Bluetooth Low Energy (BLE) protocols, enabling devices to unilaterally broadcast and receive multiple audio streams, allowing users to organize and cycle through these streams based on user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional paired connections are used for wireless audio data transmission, then connection stability is ensured, but connection time increases significantly
Solution Approach 1:
The audio device performs preliminary actions by broadcasting its presence and receiving parameters in advance before actual audio playback is needed. The source device pre-establishes broadcast parameters and the audio device pre-discovers available streams, so that when connection is needed, the system can quickly transition to audio playback without completing full pairing handshakes.
Solution Approach 2:
The invention extracts the essential connection establishment steps from the complete Bluetooth pairing process. Instead of requiring full mutual authentication and link creation, the system extracts only the necessary parameter exchange and broadcast reception, eliminating time-consuming pairing procedures while maintaining sufficient connection reliability for audio streaming.
2Adaptability or versatility
If multiple source devices are available for connection, then user choice and adaptability improve, but connection complexity increases
Solution Approach 1:
The system segments the connection process into independent discovery and selection phases. Each source device independently broadcasts its parameters, and the audio device independently discovers and evaluates each stream. This segmentation allows multiple sources to coexist without creating complex inter-device coordination, as each connection is established separately through simple broadcast reception.
Solution Approach 2:
The audio device performs self-service by autonomously discovering available broadcast streams and autonomously selecting which stream to connect to based on pre-stored parameters. The device independently manages the connection process without requiring coordination between multiple source devices, simplifying the overall system complexity while maintaining the ability to work with multiple sources.
3Reliability
If traditional Bluetooth classic connections are used, then audio quality is maintained, but energy consumption increases
Solution Approach 1:
The system changes the fundamental transmission parameters by switching from connection-oriented Bluetooth Classic to connectionless Bluetooth Low Energy broadcast mode. This parameter change enables the use of more efficient audio codecs like LC3 that are optimized for low-power transmission, while the broadcast mechanism itself consumes significantly less energy than maintaining a traditional paired connection.
Solution Approach 2:
The invention substitutes the mechanical pairing handshake process with a simpler broadcast-based communication mechanism. Instead of establishing complex mutual authentication and connection state machines, the system uses unidirectional broadcasts with pre-stored parameters, replacing the heavyweight Bluetooth Classic connection establishment with a lighter-weight broadcast reception approach.
Data Source
AI summary
An audio system, device, and method for broadcasting, discovering, and receiving wireless audio data connections. The exemplary systems and methods described herein utilize an Isochronous Broadcast Stream topology to unilaterally broadcast a wireless audio data stream from a first audio device to a plurality of second audio devices. The audio devices described are configured to receive audio content according to a first wireless protocol, generate a Bluetooth Low Energy (LE) broadcast stream based on the audio content, and broadcast the Bluetooth LE broadcast stream to a plurality of second audio devices.