Active earphone noise reduction method suitable for ship high-noise scene

A noise and scene technology, applied in the field of noise reduction headphones, can solve the problems of single noise reduction mode of noise reduction headphones and unsatisfactory noise reduction effect, and achieve good feedback compensation and good noise reduction effect

Pending Publication Date: 2020-04-07
上海集研机电股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide an active earphone noise reduction method suitable for ships with high noise scene, which solves the problem that the current noise reduction earphones adopt a single noise reduction mode, and the noise reduction effect is not ideal

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  • Active earphone noise reduction method suitable for ship high-noise scene

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Effect test

Embodiment 1

[0042] The function management module judges whether the noise reduction effect is good or bad according to the proportion β (0≤β≤1) of the low-frequency component in the feedforward audio signal;

[0043] a. When β is less than 0.5, it means that the noise reduction effect of the feedforward system is good, and the function management module only outputs the feedforward noise reduction signal to the moving coil drive unit;

[0044] b. When β is greater than 0.5, it means that the noise reduction effect of the feedforward system is poor, and the function management module outputs the feedforward noise reduction signal and the feedback noise reduction signal to the dynamic drive unit at the same time, and optimizes the noise reduction by manually adjusting the attenuation coefficient α.

Embodiment 2

[0046] The function management module judges whether the noise reduction effect is good or bad according to the proportion β (0≤β≤1) of the low-frequency component in the feedforward audio signal;

[0047] a. When β is less than 0.3, it means that the noise reduction effect of the feedforward system is good, and the function management module only outputs the feedforward noise reduction signal to the moving coil drive unit;

[0048] b. When β is greater than 0.3, it means that the noise reduction effect of the feedforward system is poor, and the function management module outputs the feedforward noise reduction signal and the feedback noise reduction signal to the dynamic drive unit at the same time, and optimizes the noise reduction by manually adjusting the attenuation coefficient α.

Embodiment 3

[0050] The function management module judges whether the noise reduction effect is good or bad according to the proportion β (0≤β≤1) of the low-frequency component in the feedforward audio signal;

[0051] a. When β is less than 0.01, it means that the noise reduction effect of the feedforward system is good, and the function management module only outputs the feedforward noise reduction signal to the moving coil drive unit;

[0052] b. When β is greater than 0.01, it means that the noise reduction effect of the feedforward system is poor, and the function management module outputs the feedforward noise reduction signal and the feedback noise reduction signal to the dynamic drive unit at the same time, and optimizes the noise reduction by manually adjusting the attenuation coefficient α.

[0053] The present invention implements an active noise reduction system based on wavelet transform, feedforward and feedback fusion, which can effectively adjust its noise reduction mode fle...

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Abstract

The invention discloses an active earphone noise reduction method suitable for a ship high-noise scene, and belongs to the technical field of noise reduction earphones. The method comprises the following steps: (1) after a feed-forward microphone collects environmental sound information, obtaining an inverted noise signal, namely a feed-forward noise reduction signal, and forming a feed-forward anti-noise wave; (2) synchronizing with the step (1), acquiring audio information near the ear by a feedback microphone, generating a feedback noise reduction signal, and forming a feedback anti-noise wave; and (3) receiving the feed-forward noise reduction signal and the feedback noise reduction signal at the same time, and outputting at least one of the two signals to the moving coil driving unitby the function management module. The active noise reduction system based on wavelet transform, feedforward and feedback fusion is achieved, the noise reduction mode of the active noise reduction system can be effectively and flexibly adjusted according to the environment, the requirement for reducing noise on a ship can be well met, and a good noise reduction effect can also be maintained in theenvironment where the noise of the ship changes drastically.

Description

technical field [0001] The invention relates to an active earphone noise reduction method suitable for ships with high noise scene, and belongs to the technical field of noise reduction earphones. Background technique [0002] The large amount of noise generated by the main engine, shafting, propeller and other equipment on the ship has seriously affected the health of the crew, resulting in poor communication and great harm. Through noise control technology, the above problems can be effectively solved. [0003] Noise is the sound produced by the random movement of the sounding body, which propagates in the medium in the form of waves. According to the processing method of sound waves, noise reduction technology can be divided into passive noise reduction technology and active noise reduction technology. Passive noise reduction technology uses sound-insulating or sound-absorbing materials to reflect or absorb noise waves to reduce the noise hazard of the wearer; active no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/10G10K11/178
CPCH04R1/1083H04R1/1008G10K11/1785G10K11/17879G10K11/1781H04R2460/01G10K2210/1081G10K2210/3027G10K2210/3026
Inventor 胡大力孙兆威
Owner 上海集研机电股份有限公司
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