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Feedforward-based ANR adjustment responsive to environmental noise levels

An environmental noise, feedforward technology, used in sound-generating equipment, active noise control, musical instruments, etc.

Inactive Publication Date: 2012-04-11
BOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

More specifically, because the electrical output of such a microphone is used as the basis for generating an anti-noise sound, clipping in this electrical output can actually cause a feed-forward based ANR device to generate more noise than it reduces
Therefore, continuing to use feedforward based ANR devices in the presence of high acoustic levels of ambient noise sounds can actually lead to a worse outcome than not using feedforward based ANR devices

Method used

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  • Feedforward-based ANR adjustment responsive to environmental noise levels
  • Feedforward-based ANR adjustment responsive to environmental noise levels
  • Feedforward-based ANR adjustment responsive to environmental noise levels

Examples

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Embodiment Construction

[0018] What is disclosed and claimed herein is intended to be applicable to a variety of personal ANR devices, ie, devices configured to be at least partially worn by a user around at least one ear to provide ANR functionality to the at least one ear. It should be noted that although various specific embodiments of personal ANR devices (such as headsets and wireless earphones) are presented with a certain degree of detail, this presentation of specific embodiments is intended to facilitate understanding by using examples, It should not be taken as a limitation on the scope of the disclosure or the coverage of the claims.

[0019] What is disclosed and claimed herein is intended to be applicable to personal ANR devices that provide two-way audio communication, one-way audio communication, or no communication at all (ie, the acoustic output of audio is provided electronically by other devices). What is disclosed and claimed herein is intended to be applicable to personal ANR dev...

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PUM

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Abstract

A compression circuit of a device providing feedforward-based ANR monitors the electric signal output by a feedforward microphone for indications of the voltage levels of the electric signal output by the feedforward microphone ceasing to have a linear relationship with the acoustic levels of the sounds detected by the feedforward microphone. As long as there are no such indications, the compression circuit relays a signal to a feedforward anti-noise generator that is at least representative of the electric signal output by the feedforward microphone in which the sounds represented are not compressed, perhaps by directly relaying the signal output by the feedforward microphone as feedforward reference sounds. However, in response to detecting such indications, the compression circuit compresses the sounds represented by the signal output by the feedforward microphone prior to providing those sounds to the feedforward anti-noise generator as feedforward reference sounds, perhaps by attenuating the signal output by the feedforward microphone.

Description

technical field [0001] The present invention relates to personal active noise reduction (ANR) devices for reducing acoustic noise in the vicinity of at least one user's ear. Background technique [0002] Headphones and other physical structures of personal ANR devices worn around the user's ears to isolate the user's ears from unwanted ambient sounds have now become commonplace. Specifically, relying on actively generated anti-noise sounds to counteract unwanted ambient noise even compared to headphones or earbuds that simply physically isolate the user's ear from ambient noise using only passive noise reduction (PNR) technology Sound ANR headsets have become popular. [0003] Unfortunately, despite various improvements that have been made over time, existing personal ANR devices suffer from some drawbacks, especially in situations with very high levels of ambient noise. As is well known to those skilled in the art, a microphone is typically capable of providing an electri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
CPCG10K2210/503G10K11/178G10K2210/1081G10K11/17823G10K11/17857G10K11/17861G10K11/17881
Inventor P·G·雅姆科沃伊
Owner BOSE CORP