Active noise reduction system

By calculating and utilizing the propagation distance of the offset sound in the active noise reduction system and suppressing changes in the offset sound, the problem of noise amplification at the position of the user's ears is solved, thereby achieving the stability of the noise reduction effect and improving user comfort.

CN119339696APending Publication Date: 2025-01-21HONDA MOTOR CO LTD
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Patent Information

Application Number
CN202410943275.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-07-18
Filing Date
2024-07-15
Publication Date
2025-01-21

AI Technical Summary

Technical Problem

In an active noise reduction system, as the movable part moves, the cancelling sound propagation distance increases, causing the controller to output a large cancelling sound, which may cause the noise to amplify at the user's ear position or the noise reduction effect to deteriorate.

Method used

By calculating the propagation distance of the canceling sound and suppressing the change of the canceling sound based on this distance, the noise is prevented from being amplified at the position of the user's ears. Specific measures include using the controller to calculate the propagation distance of the cancellation sound, and correcting the estimated signal of the noise or cancellation sound based on the distance to adjust the output of the cancellation sound.

Benefits of technology

Effectively prevent noise from amplifying at the location of the user's ear, maintain the stability of the noise reduction effect, and ensure the comfort of the user.

✦ Generated by Eureka AI based on patent content.

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Abstract

An active noise reduction system includes: a cancellation sound output device configured to output a cancellation sound for cancelling noise; an error microphone configured to generate an error signal based on the noise and the cancellation sound; and a controller configured to control the cancel sound output device based on the error signal, in which the controller is configured to calculate a cancel sound propagation distance, which is a distance from the cancel sound output device to the error microphone, and suppress a change in the cancel sound based on the cancel sound propagation distance.
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