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A microphone pre-amplifier circuit with a gain trimming function

A preamplifier and microphone technology, applied in the direction of transducer circuit, gain control, amplification control, etc., can solve the problem of not being able to adapt to different types of microphones

Active Publication Date: 2019-05-31
SHENZHEN ME MICROELETRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to propose a microphone preamplifier circuit with gain trimming, aiming at solving the technical problem that the existing microphone preamplifier circuit cannot be adapted to different types of microphones

Method used

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  • A microphone pre-amplifier circuit with a gain trimming function
  • A microphone pre-amplifier circuit with a gain trimming function

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, the ...

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Abstract

The invention relates to the technical field of amplifiers. The invention discloses a microphone pre-amplifier circuit with a gain trimming function. The circuit comprises a pre-amplifier, a trimmableresistor array, a digital trimming control unit and a register unit circuit. A group of adjustable resistor arrays are connected in series between the negative end and the output end of the pre-amplifier; the trimming resistor array is connected with the digital trimming control unit; an interference signal source is input from the positive end of the pre-amplifier; wherein the output end of thepre-amplifier is connected with the input end of an audio amplifier of a driving unit, and the digital trimming control unit adjusts the resistance value of the trimmable resistor array according to atrimming target of the pre-amplifier to realize the adjustment and correction of the gain of the pre-amplifier so as to adapt to different types of microphones. According to the technical scheme, thegain of the pre-amplifier can be adjusted and corrected to adapt to different types of microphone tolerances, and the compatibility is high.

Description

technical field [0001] The invention relates to the technical field of amplifiers, in particular to a microphone preamplifier circuit with gain trimming. Background technique [0002] The preamplifier refers to a circuit or electronic device placed between the source and the amplifier stage. It is specially designed to accept the weak voltage signal from the source. The main function of the preamplifier is to compensate the speaker unit and ANC microphone. tolerance, the microphone preamplifier is one of the main components that introduce noise. In the active noise reduction (ANC) equipment, it is necessary to collect the noise signal of the surrounding environment through the microphone, and then convert the sampled weak noise signal into an electrical signal, change the amplitude and phase of the electrical signal through the feedback filter network, and then transmit The ANC processing module enters the reverse processing, and finally the processed electrical signal is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H03G3/30
CPCH03G3/30H04R3/00
Inventor 江建方
Owner SHENZHEN ME MICROELETRONICS CO LTD
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