Audio Signal Compression for Micro-Speaker Voice Coil Protection
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Solution Overview
Problem
Micro-speakers in portable devices can overheat when subjected to high power output, leading to damage, and existing methods to limit power output result in unfavorable sound quality for single-frequency or frequency-sweeping signals.
Innovation Solution
An audio signal processing method that determines a power protection gain based on the power and frequency point of single-frequency or frequency-sweeping signals, performing compression processing to maintain the voice coil within a safe temperature range while reducing auditory harm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power output of the power amplifier is fixed to protect the micro-speaker, then the voice coil temperature is kept safe, but the user's auditory system is adversely affected when playing single-frequency or frequency-sweeping signals
Solution Approach 1:
The patent applies dynamic gain adjustment by detecting whether the audio signal is a single-frequency or frequency-sweeping signal, and dynamically setting different power protection gains accordingly. When such signals are detected, a first power protection gain is applied; for other signals, a second power protection gain is used. This dynamic adaptation resolves the contradiction by making the protection mechanism flexible rather than fixed.
Solution Approach 2:
The patent changes the parameter of power protection gain based on signal type detection. By identifying the frequency characteristics of the input signal and adjusting the gain parameter accordingly, the system achieves both voice coil protection and auditory system friendliness. The gain parameter is modified from a fixed value to a variable that adapts to different signal conditions.
2Object-affected harmful factors
If high power output is used for single-frequency or frequency-sweeping signals, then the user experience is improved, but the voice coil overheats and may be damaged
Solution Approach 1:
The system dynamically adjusts the power protection gain based on real-time signal detection. When single-frequency or frequency-sweeping signals are detected, the system applies appropriate gain limitation to prevent voice coil overheating, while maintaining acceptable audio quality. This dynamic response allows the system to adapt to different signal types and prevent thermal damage.
Solution Approach 2:
The patent implements preliminary detection of signal type before power amplification. By detecting whether the incoming signal is a single-frequency or frequency-sweeping signal in advance, the system can pre-apply the appropriate power protection gain, preventing voice coil overheating before it occurs. This proactive approach avoids the need for reactive thermal management.
3Reliability
If fixed power output limitation is applied, then voice coil protection is achieved, but the overall audio quality and power utilization are reduced
Solution Approach 1:
The patent modifies the power protection gain parameter based on signal type, allowing the power amplifier to operate at higher utilization levels for normal audio signals while applying restrictive gains only when necessary for protection. This selective parameter adjustment maintains voice coil protection while maximizing power amplifier utilization for beneficial signal types.
Solution Approach 2:
The system dynamically adjusts the power protection gain to match the actual needs of different signal types. For single-frequency and frequency-sweeping signals, appropriate gain limitation is applied for protection; for other signals, higher gain is permitted to improve power amplifier utilization. This dynamic adjustment optimizes both protection and utilization.
Data Source
AI summary
This application discloses an audio signal processing method and apparatus, an electronic device, and a storage medium. The method includes: determining, when a first audio signal is a single-frequency signal or a frequency-sweeping signal and a frequency point of the first audio signal belongs to a target frequency band, a power protection gain based on a power and the frequency point of the first audio signal; and performing compression processing on the first audio signal based on the power protection gain.