Headset Noise Attenuation Estimation for Accurate Sound Exposure

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Solution Overview

Problem

Existing acoustic dosimetry devices inaccurately estimate a user's noise exposure when they are wearing headsets that attenuate environmental noise, as the devices fail to account for the headset's passive and active noise reduction, leading to an underestimation of the actual noise exposure.

Innovation Solution

A system that determines a user's actual noise exposure by estimating the level of attenuation applied by the headset, using a companion device to capture ambient sound levels and determine the headset's audio processing mode, allowing for accurate noise exposure monitoring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a headset with passive and active noise reduction is worn by a user, then the user's perceived environmental noise is attenuated, but the companion device's estimation of the user's noise exposure becomes inaccurate (underestimation)

Engineering Contradiction:

Improveenvironmental noise perceptionVSAvoidnoise exposure estimation accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The patent introduces an intermediary estimation model that acts as a mediator between the ambient noise measurement and the user's actual ear canal noise exposure. The model uses the measured ambient noise level, headset attenuation characteristics, and audio processing mode as intermediaries to calculate the true noise exposure, resolving the discrepancy between environmental noise and perceived noise.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system implements feedback by continuously monitoring the audio processing mode of the headset and adjusting the noise exposure estimation accordingly. The companion device receives feedback about the headset's operational state (ANC, transparency, or normal mode) and uses this feedback to select appropriate attenuation values for accurate noise exposure calculation.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the headset operates in different audio processing modes (ANC, transparency, normal), then the level of noise attenuation varies, but the companion device cannot accurately determine the actual noise exposure without knowing the operating mode

Engineering Contradiction:

Improveaudio processing mode flexibilityVSAvoidnoise exposure measurement

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies dynamics by making the noise exposure estimation adaptive to the headset's changing operational state. The system dynamically adjusts the attenuation calculation based on the current audio processing mode, allowing accurate noise measurement regardless of whether the headset is in ANC, transparency, or normal mode, thus resolving the measurement difficulty.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system performs preliminary action by establishing a correspondence between audio processing modes and their respective attenuation characteristics in advance. This pre-established knowledge base allows the companion device to quickly and accurately determine noise exposure once the headset's operating mode is identified, without requiring complex real-time analysis.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If the companion device uses ambient noise level alone to estimate noise exposure, then the estimation is simple, but it is inaccurate when the headset attenuates environmental noise

Engineering Contradiction:

Improveestimation processVSAvoidnoise exposure accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent changes parameters by introducing additional variables into the estimation process: headset attenuation characteristics and audio processing mode. Instead of using only ambient noise level, the system modifies the estimation parameters to include mode-specific attenuation values, thereby maintaining relatively simple device complexity while significantly improving measurement precision.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260019737A1Method and System for Estimating Environmental Noise Attenuation

Publication Date: 2026.01.15 APPLE INC

AI summary

A method that includes determining a level of sound within an acoustic environment captured by a microphone; receiving, from a headset worn by a user, data indicating an audio processing mode in which the headset is operating; determining a level of attenuation of the sound based on the audio processing mode and the level of sound; estimating sound exposure based on at least the level of attenuation and the level of sound; and transmitting the sound exposure to an application program.