Bluetooth LE Audio Broadcasting Volume Control
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Solution Overview
Problem
The Bluetooth LE Audio technology does not specify how to flexibly adjust the audio volume of audio receiving terminals during audio broadcasting, nor does it provide a mechanism for synchronously adjusting the audio volume of multiple Bluetooth member devices, leading to unpredictable audio volumes that can cause discomfort or missed external alert signals.
Innovation Solution
A Bluetooth audio broadcasting system that includes an audio broadcasting device capable of broadcasting Bluetooth LE audio packets through a Broadcast Isochronous Stream, and multiple Bluetooth member devices with control circuits that parse received packets to adjust audio playback accordingly. The system generates and transmits target control commands to reduce audio volume when alert signals or specific ambient sounds are detected, ensuring synchronized volume adjustments across devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the BLE Audio technology is used to conduct audio broadcasting operations with multiple Bluetooth member devices, then audio quality is improved and power consumption is reduced, but the audio volume becomes unpredictable and cannot be flexibly or synchronously adjusted across devices
Solution Approach 1:
The audio broadcasting device transmits volume control commands to member devices based on detected ambient sound levels or user preferences, creating a feedback loop that enables dynamic volume adjustment. The control circuit receives ambient sound information and automatically adjusts playback volume accordingly, resolving the issue of unpredictable audio volume while maintaining BLE Audio energy efficiency
Solution Approach 2:
The system dynamically changes the audio volume parameter based on ambient sound detection results or user settings. By monitoring external acoustic environment and adjusting the playback volume parameter in real-time, the system achieves flexible and synchronous volume control across multiple member devices without increasing power consumption
2Measurement precision
If the audio volume is increased to ensure clear audio playback, then audio clarity is improved, but external alert signals may be missed causing safety issues
Solution Approach 1:
The audio volume is made dynamic rather than static, automatically adjusting based on ambient sound detection. When the detection circuit identifies alert signals or specific ambient sounds, the system dynamically reduces volume to allow external sounds to be heard, while maintaining high audio clarity during normal playback conditions
Solution Approach 2:
The detection circuit acts as an intermediary between the audio playback system and the external environment. It monitors ambient sounds and communicates with the control circuit to mediate volume adjustments, ensuring that audio clarity is maintained while preventing missed alert signals by reducing volume when external sounds are detected
3Device complexity
If a single audio volume configuration is used for all users, then device complexity is reduced, but it cannot meet the requirements of different users with different sensitivity and tolerance
Solution Approach 1:
The system performs preliminary actions by detecting ambient sound levels and user preferences before audio playback begins. The control circuit pre-configures appropriate volume levels based on environmental conditions and stored user profiles, eliminating the need for complex manual configuration while providing personalized volume settings for different users
Solution Approach 2:
The audio system serves itself by automatically detecting ambient conditions and adjusting volume without user intervention. The detection circuit and control circuit work together to self-regulate playback volume based on environmental factors and user preferences, reducing device complexity while maintaining high adaptability to different users' needs
Data Source
AI summary
A Bluetooth audio broadcasting system includes: an audio broadcasting device arranged to operably broadcast BLE (Bluetooth Low Energy) audio packets; a first Bluetooth member device arranged to operably parse the BLE audio packets to acquire a predetermined audio data and to operably control a first audio playback circuit to playback the predetermined audio data; and a second Bluetooth member device arranged to operably parse the BLE audio packets to acquire the predetermined audio data and to operably control a second audio playback circuit to playback the predetermined audio data. When the first or second Bluetooth member device receives an alert signal, or when a specific ambient sound occurs in the surrounding environment of the first or second Bluetooth member device, the audio broadcasting device utilizes a target control command to instruct the first and second Bluetooth member devices to synchronously reduce their volume to be lower than a predetermined threshold.