Hearing Protection System Dynamic ANC Switching
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Solution Overview
Problem
Existing noise cancellation technologies fail to effectively block external high-sound-pressure-level energy, leading to hearing impairment, especially when active noise cancellation is saturated or disabled.
Innovation Solution
A hearing protection method that presets two sound pressure energy thresholds, enabling active noise cancellation below the second threshold and switching to passive noise cancellation when the energy exceeds the second threshold, thereby effectively blocking high-sound-pressure-level energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active noise cancellation is enabled to reduce ambient noise, then hearing protection is improved, but when high sound pressure level occurs the microphone becomes saturated causing distorted signal and increased hearing impairment
Solution Approach 1:
The system continuously monitors the sound pressure level detected by the microphone and dynamically adjusts the ANC processing based on the measured acoustic environment. When high sound pressure is detected, the system reduces or disables ANC processing to prevent microphone saturation and distorted signal generation, thereby maintaining reliable hearing protection without introducing harmful distortion
Solution Approach 2:
The noise cancellation system transitions from a static ANC configuration to a dynamic system that adapts its processing intensity based on real-time sound pressure conditions. The system dynamically switches between different operational states (ANC enabled, ANC reduced, ANC disabled) according to the acoustic environment, preventing microphone saturation while maintaining effective noise reduction when conditions permit
2Device complexity
If passive noise cancellation alone is used to block external noise, then device complexity is reduced, but high-sound-pressure-level energy cannot be effectively reduced leading to hearing impairment
Solution Approach 1:
The system integrates both passive noise cancellation (physical earcup isolation) and active noise cancellation (electronic signal processing) into a unified multi-functional hearing protection system. The passive component provides baseline noise blocking while the active component dynamically supplements it when acoustic conditions permit, creating a versatile system that handles both low-level ambient noise and high-level impulsive sounds effectively
3Ease of operation
If ANC is in pass-through mode to allow external sound, then awareness of external environment is improved, but high-sound-pressure-level energy is amplified causing hearing impairment
Solution Approach 1:
The pass-through mode incorporates real-time sound pressure level monitoring and dynamic gain adjustment. When high sound pressure is detected in the external environment, the system automatically reduces the amplification gain or disables pass-through mode to prevent harmful energy from reaching the ear, while maintaining environmental awareness at safe levels during normal conditions
Data Source
AI summary
The present disclosure provides a hearing protection method capable of blocking external high-sound-pressure-level energy, including: a second sound pressure energy threshold being greater than a first sound pressure energy threshold; when an external sound energy value is greater than the first sound pressure energy threshold and is less than the second sound pressure energy threshold, enabling a preset active noise cancellation function; and when the external sound energy value is greater than the second sound pressure energy threshold, disabling the preset active noise cancellation function, and blocking high-sound-pressure-level energy by means of passive noise cancellation. The present disclosure can block the external high-sound-pressure-level energy.