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Noise-reduction circuit of earphone microphone signal, filter circuit and equipment

A filter circuit and earphone technology, which is applied in signal processing, electrical components, frequency response correction, etc., can solve the problems of earphone microphone signal noise, etc., and achieve the effect of improving the output sound quality

Inactive Publication Date: 2017-09-15
SHANGHAI YUDE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, an embodiment of the present invention provides a noise reduction circuit, a filter circuit, and a device for earphone microphone signals, so as to solve the problem of relatively large noise during transmission of earphone microphone signals in the prior art. noise function

Method used

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  • Noise-reduction circuit of earphone microphone signal, filter circuit and equipment
  • Noise-reduction circuit of earphone microphone signal, filter circuit and equipment
  • Noise-reduction circuit of earphone microphone signal, filter circuit and equipment

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Embodiment 1

[0039] Figure 1A It is a structural block diagram of a noise reduction circuit for an earphone microphone signal provided in Embodiment 1 of the present invention. The noise reduction circuit for an earphone microphone signal is suitable for reducing noise in an earphone microphone signal. The noise reduction circuit can be integrated into an earphone of an earphone microphone equipment, such as Figure 1A As shown, the noise reduction circuit for the headphone microphone signal includes: a low frequency filter module 11 , a middle and low frequency filter module 12 and a high frequency filter module 13 . Wherein, the first end of the low-frequency filter module 11 is electrically connected to the earphone microphone signal input terminal 20, and the second end of the low-frequency filter module 11 is grounded, which is used to reduce the noise of the low-frequency signal in the earphone microphone signal; the second end of the low-frequency filter module 12 One end is electri...

Embodiment 2

[0045] figure 2 It is a structural block diagram of a filter circuit for an earphone microphone signal provided in Embodiment 2 of the present invention. The filter circuit for the earphone microphone signal is suitable for filtering the noise in the conversion and transmission process of the earphone microphone signal. The filter circuit is integrated in a headphone device with a headphone microphone. Such as figure 2 As shown, the filter circuit of the headset microphone includes: a voltage divider module 30, a common mode filter module 40, a differential mode filter module 50, a DC blocking module 60, and a noise reduction circuit 10 for the headset microphone signal provided by the embodiment of the present invention.

[0046] Wherein, the first end of the voltage dividing module 30 is electrically connected to the noise reduction circuit 10 of the earphone microphone through the first control node A, and the second end of the voltage dividing module 30 is electrically ...

Embodiment 3

[0050] image 3 It is a structural block diagram of a filter circuit for headphone microphone signals provided by Embodiment 3 of the present invention. This embodiment is optimized on the basis of the above embodiments, and provides a preferred addition of a power supply circuit and Signal detection module. Such as image 3 As shown, the filter circuit for the headphone microphone signal further includes a power supply circuit 80 and a signal detection circuit 90 on the basis of the above-mentioned embodiments.

[0051] Wherein, the first end of the signal detection module 90 is electrically connected to the detection signal input end 74, the second end of the signal detection module 90 is electrically connected to the second control node B, and the first end of the power supply circuit 80 is electrically connected to the power signal input end 73. connected, the second end of the power supply circuit 80 is electrically connected to the first control node A, and the third e...

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Abstract

The embodiment of the invention discloses a noise-reduction circuit of an earphone microphone signal, a filter circuit and equipment. The noise-reduction circuit of the earphone microphone comprises a low-frequency filter module, a low and medium frequency filter module and a high frequency filter module, wherein the low frequency filter module is used for performing filter processing on the noise in a low frequency signal of the earphone microphone signal; a low and medium frequency filter module is used for performing filtering processing on the noise in the low and medium signal of the earphone microphone signal; the high frequency filter module is used for performing the filter processing on the noise in the high-frequency signal of the earphone microphone signal. By using the noise-reduction circuit of the earphone microphone signal, the filter circuit and the equipment disclosed by the embodiment of the invention, the filter noise reduction is performed on the noise in each frequency range through each of the low frequency filter module, the low and medium frequency filter module and the high frequency filter module, thereby achieving the level that the human ear cannot distinguish, and the output tone quality of the earphone microphone signal is improved.

Description

technical field [0001] Embodiments of the present invention relate to circuit technology, and in particular to a noise reduction circuit, a filter circuit and equipment for earphone microphone signals. Background technique [0002] Noise is a sound with chaotic pitch and intensity changes and sounds dissonant. It is produced by the irregular vibration of the sounding body. Noise will interfere with the sound that people want to hear, so that people cannot listen to what they want to hear. Sounds are identified. At present, in order to protect people's hearing and physical health, the allowable value of noise is generally 75-90 decibels. [0003] With the advancement of technology, various earphones come into view and are used in different occasions. In order to meet the call requirements, the headset is usually equipped with a microphone, which can convert the sound into a corresponding electrical signal for transmission. However, the process of sound conversion and trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/04
CPCH04R3/04H04R2430/00
Inventor 熊锐季新高
Owner SHANGHAI YUDE TECH CO LTD
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