Microphone squeak-resisting circuit

A microphone and anti-howling technology, applied in the field of microphones, can solve the problems of loud microphone howling, affecting actual sound effects, burning out power amplifiers and sound-generating equipment, etc.

Active Publication Date: 2017-01-04
NINGBO ZHONGRONG ACOUSTICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microphone howling is very harmful. When self-excited, the power amplifier will produce a large power output, which may exceed the tolerance range of the sound reinforcement equipment, and burn out the power amplifier and sound-generating equipment.
In addition, the sound pressure output during howling is very high, which seriously affects the atmosphere of various activities
[0003] In concerts, broadcasting, conferences and other scenarios, the microphone will produce howling due to feedback self-excitation, and the highly sensitive acquisition equipment when monitoring the pickup is also very easy to collect the signal played by the speaker and produce howling
The current common processing circuits are not ideal for this kind of howling, and often affect the actual sound effect while suppressing howling.

Method used

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Examples

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Embodiment Construction

[0020] A microphone anti-howling circuit according to the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like figure 1 As shown, a microphone anti-howling circuit, including:

[0022] Audio signal input terminal 1, used to input audio signal;

[0023] Amplifying circuit 2, the input terminal is connected to the audio signal input terminal 1 to amplify the audio signal;

[0024] The audio signal output terminal 3 is connected to the output terminal of the amplifier circuit 2 for outputting the processed audio signal, that is, the audio signal input terminal 1, the amplifier circuit 2, and the audio signal output terminal 3 are sequentially connected in series;

[0025] The frequency selection circuit 4 is connected to the audio signal input terminal 1 and the input terminal of the amplifier circuit 2 to select the howling signal in the audio signal, and only the signal of the howling signal in...

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Abstract

The invention provides a microphone squeak-resisting circuit. The microphone squeak-resisting circuit comprises an audio signal input end, an amplifying circuit and an audio signal output end which are electrically connected in sequence, and a phase-inverting amplifying circuit and a secondary bandpass feedback circuit which are electrically connected with each other, wherein an input end and an output end of the amplifying circuit are electrically connected through a frequency selection circuit and a primary bandpass feedback circuit; and an output end of the primary bandpass feedback circuit is connected with an input end of the primary bandpass feedback circuit after passing through an inverting amplifier and the secondary bandpass feedback circuit in sequence. The microphone squeak-resisting circuit has a simple integral structure; a sound effect is ensured through twice feedback; and suppression of a squeak signal is realized.

Description

technical field [0001] The invention relates to the field of microphones, in particular to a microphone anti-howling circuit. Background technique [0002] In the actual use of audio, the howling problem always affects the quality of audio. To put it simply, howling needs to meet the following three points: 1. The microphone and speaker are used at the same time; 2. The sound reproduced by the speaker system can be transmitted to the microphone through the space; 3. The sound energy from the speaker is large enough for the microphone to pick up sound Sensitivity is high enough. The microphone howling is very harmful. When self-excited, the power amplifier will produce a large power output, which may exceed the tolerance range of the sound reinforcement equipment, and burn the power amplifier and sound-generating equipment. In addition, the sound pressure output during howling is very high, which seriously affects the atmosphere of various activities. [0003] In concerts,...

Claims

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Application Information

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IPC IPC(8): H04R3/00
Inventor 闫峻袁安民
Owner NINGBO ZHONGRONG ACOUSTICS TECH
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