Method and device for calibrating sensitivity of microphone

A calibration method and microphone technology, applied in the direction of electrical components, etc., to achieve cost reduction, wide application range, and the effect of eliminating pin connections

Active Publication Date: 2010-01-06
SHANDONG GETTOP ACOUSTIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More importantly, it overcomes the technical bias that control signals must be transmitted through proprietary control lines in the prior art, and provides a new solution

Method used

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  • Method and device for calibrating sensitivity of microphone
  • Method and device for calibrating sensitivity of microphone
  • Method and device for calibrating sensitivity of microphone

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Embodiment Construction

[0049] The features and advantages of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] In the microphone calibration method proposed by the present invention, the gain of the amplifier and / or the bias voltage are adjusted by setting the memory, thereby adjusting the sensitivity of the microphone to a specific value, thereby achieving the purpose of calibrating the sensitivity of the microphone. The core idea is that no additional pins are required to set the memory, but the calibration control signal is provided by the sound source set outside the microphone. The calibration control circuit converts the sound signal detected by the microphone into a calibration control signal. According to the control signal Set the memory to complete the calibration process of the microphone.

[0051] A kind of microphone calibration method according to the idea of ​​the present invention such as image 3 As shown, it includes th...

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Abstract

The invention relates to a method for calibrating sensitivity of a microphone, comprising the following steps: receiving a power supply voltage signal and a sound input signal; judging whether the power supply voltage signal meets a preset condition or not, if so, entering a calibrating mode to continue, and otherwise, stopping; restoring a clock signal from a sound signal; restoring a data signal from the power supply voltage signal; and regulating the amplifier gain and/or microphone bias voltage according to the clock signal and the data signal. A microphone calibrating circuit applying the method comprises a clock restoring module, a data signal restoring module, a gain regulating and controlling and register interface module and a storage, wherein the clock restoring module is used for restoring the clock signal from an output signal of a sound/electricity switching assembly; the data signal restoring module is used for restoring the data signal from the power supply voltage signal, the gain regulating and controlling and register interface module is used for writing amplifier gain regulating data into the storage according to the output of the clock restoring module and the data signal restoring module, and the storage is used for receiving the amplifier gain regulating data from the gain regulating and controlling and register interface module and is used as the grain arrangement when an amplifier normally operates.

Description

technical field [0001] The present invention relates to a sound collection device—microphone, more precisely, the present invention relates to a microphone sensitivity calibration method and a circuit for realizing the microphone sensitivity calibration method. Background technique [0002] The microphone is generally composed of an acoustic-electric conversion component and an amplifier. The acoustic-electric conversion component converts the sound into a weak electrical signal, and the amplifier buffers and amplifies the weak electrical signal and converts it into a voltage signal of a specific size. For example, in a typical capacitive acoustic-electric conversion component, a capacitor is formed by a fixed plate and a vibrating plate that vibrates with sound pressure, and the external sound waves drive the vibrating plate to move, making the gap between the fixed plate and the vibrating plate The change brings about the change of the capacitance, and the sound is detecte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R29/00
Inventor 杨少军
Owner SHANDONG GETTOP ACOUSTIC
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