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Noise-canceling system

By using the inverting amplification circuit and the addition/subtraction circuit in the noise cancellation system, combined with the inversion and amplification of the filter circuit, the problem of poor noise cancellation effect in the existing technology is solved, and natural noise cancellation within a wide frequency band is achieved. and noise accuracy improvement.

Inactive Publication Date: 2014-04-09
AUDIO TECHNICA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no such constituent elements in electronic circuits, so it is impossible to realize

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0023] An example of an embodiment of the noise canceling system of the present invention will be described. Here, an example is used for noise canceling headphones as an example of a noise canceling system. figure 1 It is a schematic diagram showing only one housing of the noise canceling earphone composed of a pair of left and right. figure 1 Among them, inside the earphone case 1, the noise canceling unit 100 (hereinafter referred to as "NC unit 100") constituting the core of the noise canceling system collects and converts the ambient noise of the noise canceling earphones N The microphone unit 60 , which is a post-output electric signal, is assembled toward the outside of the earphone housing 1 . A through hole 201 for easily collecting noise N by the microphone unit 60 is provided on a part of the outer wall of the earphone case 1 . The NC unit 100 has a speaker unit for outputting to the ear 200 a music signal input by connecting to a sound source 300 such as a portab...

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PUM

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Abstract

The noise canceling system includes: a microphone unit picking up ambient noise and outputting a noise signal; a cancel signal generator generating and outputting a cancel signal eliminating the noise, and having a filter circuit outputting a signal in a predetermined frequency band included in the noise signal, an inverting amplifier circuit inverting and amplifying the output signal of the filter circuit, an amplification degree being greater than zero and smaller than one, and an adding circuit outputting a signal obtained by adding the output signal of the inverting amplifier circuit to the noise signal; and a speaker unit outputting an audio signal and the cancel signal.

Description

technical field [0001] The present invention relates to a noise canceling system capable of canceling ambient noise, which can correct phase displacement caused by characteristics, and can output a cancellation signal with higher precision. Background technique [0002] A noise canceling system that can cancel ambient noise by using a canceling sound is a noise canceling earphone that can cancel noise and listen to reproduced music because it is used in headphones or the like. Noise-canceling headphones are configured to convert ambient noise collected by a microphone unit mounted on a headphone case, etc., into a noise signal as an electrical signal, and use the noise signal to generate a A signal of noise audible to the housing (cancellation signal), by means of the cancellation sound output from the earphone speaker unit together with the music to be reproduced, the user can listen to the music in a state in which the surrounding noise is canceled. [0003] It would be i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/00H04R3/00
CPCG10K11/178G10K2210/3028G10K2210/1081G10K11/17823G10K11/17853G10K11/17873G10K11/17885
Owner AUDIO TECHNICA CORP