A Microphone Howling Suppression Circuit in Intercom System

A technology for suppressing circuits and intercom systems, applied in transducer circuits, electrical components, sensors, etc., to achieve the effect of simple and compact circuit structure, easy implementation, and avoidance of self-excited whistling

Active Publication Date: 2018-01-16
HEFEI SIWILL INTELLIGENT
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the shortcomings of the above-mentioned prior art, provide a microphone howling suppression circuit in the intercom system, ensure that the circuit suppresses the howling noise while the voice signal is not distorted, and optimize and improve the noise caused by the microphone in the audio system. howling problem

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Microphone Howling Suppression Circuit in Intercom System
  • A Microphone Howling Suppression Circuit in Intercom System
  • A Microphone Howling Suppression Circuit in Intercom System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0021] see figure 1 and figure 2 , The microphone howling suppression circuit in the intercom system of this embodiment includes a first-stage voltage limiting circuit and a second-stage negative feedback gain automatic adjustment AC non-inverting amplifying circuit. The voltage limiting circuit of the first stage includes sequentially connected: input stage coupling DC blocking capacitor C5, reverse amplifier circuit, output stage coupling DC blocking capacitor C6, diodes D1, D2 series clamping circuit; the second stage The negative feedback gain automatic adjustment AC non-inverting amplifier circuit includes: a positive phase AC amplifier circuit and a negative feedback gain automatic adjustment circuit connected to it, a DC blockin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a microphone howling suppression circuit in an intercom system, comprising: a first-stage voltage limiting circuit and a second-stage negative feedback gain automatic adjustment AC in-phase amplifying circuit, a first-stage voltage limiting circuit, Including sequential connection: input stage coupling DC blocking capacitor, reverse amplifier circuit, output stage coupling DC blocking capacitor, diode series clamping circuit; second stage negative feedback gain automatic adjustment AC non-inverting amplifier circuit, including: positive phase AC The amplifier circuit and the negative feedback gain automatic adjustment circuit connected to it, the coupling DC blocking capacitor, and the AC channel amplification coupling capacitor; the first-stage voltage limiting circuit and the second-stage negative feedback gain automatic adjustment AC non-inverting amplifier circuit through The coupling capacitor is connected, and the two-stage circuits are connected to the DC bias circuit. This design can ensure that the circuit suppresses the howling noise while the voice signal is not lost, and optimizes and improves the howling problem caused by the microphone in the audio system.

Description

technical field [0001] The invention relates to the technical field of an analog circuit for processing audio signals, in particular to a microphone howling suppression circuit for an intercom system. Background technique [0002] In the actual use of audio, the howling problem always affects the quality of audio. Generally, "howling" occurs when distortion is used, and it also occurs when delayed reverb is used. It is caused by the overload of the input signal, which is the first reason. And sometimes as long as you stand a little farther away from the speaker, the "howling" will disappear, and the distance from the speaker is too close, which is the second reason. The sound of "howling" is different when standing in different positions, and the angle between the speaker and the string is wrong, which is the third reason. Different timbres will have different "howling", and the frequency of the sound is wrong. This is the fourth reason. [0003] The howling caused by fee...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 孙奎杨亮
Owner HEFEI SIWILL INTELLIGENT
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap