Headset ANC Filter Adaptation for Different Cushion Types
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Solution Overview
Problem
Headsets with different cushions provide varying degrees of passive noise cancellation and sound quality, leading to inconsistent audio experiences due to differences in cushion size and material, which affect the amount of ambient noise reduction and sound characteristics.
Innovation Solution
An audio system that identifies the coupled cushion and selects appropriate active noise cancellation (ANC) and equalization (EQ) filters to adapt and equalize frequency responses, ensuring consistent sound output across different cushions by generating anti-noise signals and filtering audio signals based on the identified cushion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different cushions are used on headset housing, then passive noise cancellation and sound quality vary, but this leads to inconsistent audio experiences across different cushion types
Solution Approach 1:
The system dynamically adapts the ANC filter based on the detected cushion type. The filter characteristics are adjusted in real-time to compensate for variations in passive noise cancellation provided by different cushions, ensuring consistent active noise cancellation performance across all cushion types
Solution Approach 2:
The system changes the parameters of the ANC filter (such as filter coefficients, cutoff frequencies, or gain values) according to the identified cushion type. By modifying these filter parameters, the system compensates for the different acoustic environments created by various cushion materials and thicknesses
2Reliability
If cushion size and material differ, then passive noise cancellation effectiveness varies, but selecting different ANC filters for each cushion type increases system complexity
Solution Approach 1:
The system performs preliminary detection of the cushion type when the headset is first worn or when cushion replacement is detected. Based on this detection, the appropriate ANC filter is pre-selected from a set of predefined filters, avoiding the need for complex real-time analysis and simplifying the adaptation process
Solution Approach 2:
The system uses feedback from microphones to monitor the acoustic environment and verify that the selected ANC filter is providing effective noise cancellation. This feedback mechanism allows the system to confirm proper filter selection without requiring complex selection logic
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 system provides a consistent and pleasurable user experience by adapting audio filters to match sound characteristics across different cushions, maintaining similar noise reduction and sound quality regardless of cushion type.
Implementation Method 1
a reference microphone, arranged to produce a reference microphone signal in response to sounds produced by the ambient environment outside the headset
Implementation Method 2
an error microphone integrated into the headset earcup in which the speaker is integrated, arranged to produce an error microphone signal in response to sounds produced inside the earcup
Implementation Method 3
The system drives the speaker with the anti-noise signal
Implementation Method 4
generates an anti-noise signal by filtering the reference microphone signal
Data Source
AI summary
A method performed by an audio system that includes a headset. The method identifies a cushion that is coupled to a headset housing of the headset in which a speaker is integrated therein, produces a reference microphone signal from a reference microphone of the headset, selects an active noise cancellation (ANC) filter based on the identified cushion, filters the reference microphone signal with the ANC filter to produce an anti-noise signal, drives the speaker with the anti-noise signal, in response to driving the speaker, produces an error microphone signal from an error microphone of the headset, and performs an adaptive ANC function to adapt the ANC filter based on the reference microphone signal and the error microphone signal.