BLE Audio Broadcast Volume Control for Synchronized Bluetooth Playback
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Solution Overview
Problem
The Bluetooth LE Audio technology does not specify how to flexibly adjust audio volume, particularly synchronously across multiple Bluetooth devices, leading to unpredictable audio volumes that can cause discomfort and hinder the development of audio broadcasting applications.
Innovation Solution
A Bluetooth audio broadcasting system that includes an audio broadcasting device transmitting volume instructions to multiple Bluetooth member devices, allowing them to configure their audio playback volumes before broadcasting, and dynamically adjust volumes based on user requests through a Broadcast Isochronous Stream logical transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If BLE Audio technology is used for audio broadcasting, then audio quality is improved and power consumption is reduced, but audio volume cannot be flexibly adjusted and synchronized across multiple devices
Solution Approach 1:
The broadcasting device transmits volume instructions to member devices before audio playback begins, allowing member devices to pre-configure their audio volume settings. This preliminary action ensures that when audio playback starts, all devices are already properly configured, enabling flexible volume adjustment without adding complexity during the actual playback process.
Solution Approach 2:
The patent introduces volume instructions as an intermediary mechanism between the broadcasting device and member devices. These instructions carry volume configuration information that mediates the audio output of multiple devices, allowing centralized control while maintaining the independence and low power consumption characteristics of individual BLE Audio devices.
2Area of stationary object
If multiple Bluetooth member devices receive audio broadcasting simultaneously, then audio coverage is improved, but audio volume cannot be synchronized across devices causing unpredictable user experience
Solution Approach 1:
The broadcasting device sends volume instructions to member devices based on received audio data, creating a feedback loop that ensures all devices receive consistent volume configuration information. This feedback mechanism allows simultaneous audio playback across multiple devices while maintaining synchronized and consistent volume levels, preventing unpredictable user experiences.
Solution Approach 2:
The patent merges the volume control functionality into the audio data transmission process itself. By combining audio data and volume instructions into a unified transmission from the broadcasting device, multiple member devices receive both simultaneously, ensuring synchronized playback across the expanded audio coverage area.
3Device complexity
If no volume instruction mechanism is implemented, then system complexity is reduced, but audio playback becomes unpredictable and potentially harmful to users
Solution Approach 1:
Volume instructions are transmitted to member devices before audio playback commences, allowing devices to pre-configure appropriate volume levels. This preliminary configuration prevents sudden loud audio output that could harm users, while the mechanism remains integrated within the existing BLE Audio framework, adding minimal complexity to the overall system.
Data Source
AI summary
A Bluetooth audio broadcasting system includes: an audio broadcasting device, a first Bluetooth member device, and a second Bluetooth member device. The audio broadcasting device broadcasts BLE audio packets and transmits a volume adjusting instruction to the first Bluetooth member device and the second Bluetooth member device after they receive the BLE audio packets. The first Bluetooth member device parses the BLE audio packets to acquire a predetermined audio data, controls a first audio playback circuit to playback the predetermined audio data, and adjusts an audio volume of the first audio playback circuit according to the volume adjusting instruction. The second Bluetooth member device parses the BLE audio packets to acquire the predetermined audio data, controls a second audio playback circuit to playback the predetermined audio data, and adjusts an audio volume of the second audio playback circuit according to the volume adjusting instruction.