Earmuff Sensing Plate for Adaptive Noise Reduction
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Solution Overview
Problem
Existing headphones face challenges in automatically adjusting active noise reduction based on the actual wearing state, leading to potential sound leakage and user discomfort due to improper fitting.
Innovation Solution
An earmuff device with a sensing plate containing sensors that detect relative distance and pressure, coupled with a processor to adjust the gain value of the microphone unit based on sensor feedback, ensuring optimal noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the headphone uses fixed gain value for noise reduction, then the device complexity is reduced, but the active noise reduction effect deteriorates when wearing state is improper
Solution Approach 1:
The patent implements dynamic adjustment of the microphone unit's gain value based on real-time sensing feedback from the sensing plate. The processor continuously monitors sensor data indicating wearing state and automatically adjusts the gain value to optimize active noise reduction effect, transforming the fixed gain system into a dynamic adaptive system that responds to changing wearing conditions
Solution Approach 2:
The patent introduces a feedback mechanism where sensors on the sensing plate detect the relative distance and pressure between the ear portion and the sensing plate, converting this physical information into electrical signals. The processor analyzes these sensing signals to determine wearing state and uses this feedback to adjust the gain value, creating a closed-loop control system that continuously optimizes noise reduction performance
2Reliability
If the user manually adjusts the wearing state repeatedly, then the active noise reduction effect is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent enables the headphone to automatically detect and adjust its own performance parameters without user intervention. The sensing plate and sensors automatically monitor the wearing state, and the processor automatically adjusts the gain value based on the detected conditions, allowing the device to self-optimize the active noise reduction effect without requiring the user to manually adjust the wearing state
Solution Approach 2:
The feedback mechanism provides real-time information about the wearing state to the processor, which automatically responds by adjusting the gain value. This closed-loop system eliminates the need for user awareness or manual adjustment, as the device autonomously maintains optimal noise reduction performance based on continuous sensing feedback
3Measurement precision
If multiple sensors are distributed on the sensing plate, then the measurement precision of wearing state is improved, but the device complexity increases
Solution Approach 1:
The patent divides the sensing function into multiple independent sensors distributed at different positions on the sensing plate. Each sensor independently detects local conditions (relative distance and/or pressure), and the processor integrates these segmented measurements to comprehensively determine the overall wearing state, achieving high measurement precision through distributed sensing
Solution Approach 2:
The sensing plate serves multiple functions: it structurally supports the sensors, provides a mounting surface for the microphone unit, and acts as the interface for detecting wearing state through the distributed sensors. This multi-functional design integrates sensing capabilities into the existing structural component, minimizing additional complexity while achieving precise measurement
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The earmuff device automatically adjusts the noise reduction intensity based on the wearing state, enhancing the active noise reduction effect and user comfort by minimizing sound leakage.
Implementation Method 1
each sensor is configured to generate a sensing signal according to a relative distance and/or a pressure between each sensor and an ear portion of a user
Data Source
AI summary
Disclosed is an earmuff device, which is applied to a headphone and includes a housing with an accommodation cavity, a sensing plate, a microphone unit and a processor. The sensing plate is disposed in the accommodation cavity, and provided with sensors. Each sensor is configured to generate a sensing signal according to a relative distance and/or a pressure between each sensor and an ear portion of a user when the headphone is in a wearing state. The microphone unit is disposed in the accommodation cavity and configured to obtain a noise signal. The processor is disposed in the accommodation cavity, and configured to obtain sensing amounts of the sensors based on the sensing signals generated by the sensors, and adjust a gain value of the microphone unit based on a magnitude relationship between the sensing amounts of the sensors and a preset value.