Battery-Aware Audio Attenuation for Far-Field Speaker Brownout Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Far-field speakers in mobile stations can cause battery voltage to brown out due to increased current demands, leading to potential shutdowns or resets when high audio output is required.
Innovation Solution
Monitoring the battery voltage and digital audio signal levels, and applying attenuation to the audio signal when the voltage falls below a threshold to reduce the risk of brownouts and resets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the far-field speaker outputs audio signal at high volume, then the audio output power is improved, but the battery voltage drops due to increased current demands
Solution Approach 1:
The patent implements dynamic attenuation of the audio signal based on real-time battery voltage monitoring. The system continuously adjusts the audio signal level according to battery conditions, transitioning from static high-volume output to dynamic adaptive output that responds to power availability, thereby preventing voltage brownouts while maintaining optimal audio performance when possible
Solution Approach 2:
The patent employs a feedback mechanism where the audio signal level is monitored and adjusted based on battery voltage levels. The system detects when voltage drops occur and automatically attenuates the audio signal accordingly, creating a closed-loop control system that prevents harmful voltage drops while managing audio output power
2Power
If the far-field speaker driver is powered directly from the battery or voltage booster, then the audio signal strength is improved, but the risk of brown out and reset increases
Solution Approach 1:
The patent applies preliminary attenuation to the audio signal before it reaches the speaker driver when battery voltage levels indicate potential brownout conditions. By proactively reducing the audio signal level before voltage collapse occurs, the system prevents harmful current draws that would cause brownouts and resets, rather than reacting after the problem manifests
Data Source
AI summary
To reduce the risk of brown outs and resets in a mobile station using a far-field speaker, a voltage level of a battery and a level of an input audio signal are monitored. When the level of the audio signal increases past a threshold level, and the voltage level of the battery falls below a threshold voltage, an attenuation is determined and applied to the audio signal. The applied attenuation reduces the volume of the audio signal, which reduces the risk of a brown out or a reset due to insufficient voltage in the mobile station.