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Active noise reduction earphone ground noise reducing method and device

An active noise reduction and earphone technology, which is applied in the direction of earphones to reduce environmental noise, earpiece/earphone accessories, sound-generating equipment, etc., can solve the problems of uncontrollable noise, sound wave gain and phase deviation, etc., and achieve the effect of good noise reduction experience.

Inactive Publication Date: 2017-04-26
SHENZHEN SHENGYUAN TECH LTD
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, because the gain and phase of the noise sound waves emitted by the noise reduction module are prone to deviations, the earphones will greatly reduce the noise in a noisy environment, and at the same time, the earphones themselves will generate a certain noise floor. This noise floor is stable and may bother some people
And this kind of steady-state noise cannot be controlled in the laboratory environment or in the manufacturing process.

Method used

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  • Active noise reduction earphone ground noise reducing method and device
  • Active noise reduction earphone ground noise reducing method and device

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, the method for reducing the background noise of the active noise reduction earphone includes the following steps:

[0023] S1: Noise reduction microphone 1 collects environmental noise, connected to gain amplifier 3;

[0024] S2: The gain amplifier 3 is connected to the reverse amplifier circuit 4, and the reverse amplifier circuit 4 shifts the phase of the collected environmental noise signal by 180 degrees, and then outputs it through the speaker 2;

[0025] S3: The input terminal of the speaker 2 is connected to the ADC chip, and the ADC chip collects the input signal of the speaker, and then outputs it to the DSP chip. The DSP chip processes the input audio signal, analyzes the steady-state noise signal, adjusts the gain of the gain amplifier 3 with the size of the noise signal, and uses the gain amplifier to adjust the microphon...

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Abstract

The invention discloses an active noise reduction earphone ground noise reducing method and device. The method comprises the following steps: a noise reduction microphone (1) collects ambient noise and is connected with a gain amplifier (3) to form a ground noise control and feedback circuit; an input sound signal of the loudspeaker is collected and analyzed to obtain a stable noise signal in the signal; and through the amplitude of the signal, active noise reduction microphone gain value is adjusted to obtain an active noise reduction and ground noise optimum effect, thereby providing a better noise reduction experience for a user.

Description

technical field [0001] The invention relates to the field of earphone noise reduction, in particular to a method and device for reducing background noise of an active noise reduction earphone. Background technique [0002] There are two types of noise reduction in headphones: passive noise reduction and active noise reduction. Passive noise reduction is physical sound insulation, which reduces noise by blocking and absorbing sound through materials. This noise reduction method is simple, common and easy to implement. Due to the characteristics of the material, passive noise reduction only has a partial isolation effect in the high-frequency noise section, but there will be more low-frequency noise in daily life, such as "humming" air-conditioning noise, car engine sound, subway airplane noise, etc. . [0003] With the development of acoustic technology, active noise reduction appears in people's life. It is a technology that the earphone actively picks up the external no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/175H04R1/10
CPCG10K11/175H04R1/1083
Inventor 石灵吉
Owner SHENZHEN SHENGYUAN TECH LTD
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