Close-range howling-free interphone and intercom system

A short-distance, walkie-talkie technology, applied in transmission systems, transducer acoustic response prevention, electrical components, etc., can solve problems such as howling and self-excitation, reduce echo, reduce feedback howling and harsh noise, and avoid Effects of proximity effect and howling

Active Publication Date: 2022-03-11
海宁鐵三角科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The voice played at the receiving end may be fed back to the intercom sending end to form a voice loop, causing self-excitation, which in turn leads to howling

Method used

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  • Close-range howling-free interphone and intercom system
  • Close-range howling-free interphone and intercom system
  • Close-range howling-free interphone and intercom system

Examples

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Embodiment Construction

[0037] In order to facilitate those skilled in the art to better understand the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The following is only exemplary and does not limit the protection scope of the present invention.

[0038] Such as figure 1 As shown, it is a schematic diagram of a short-range non-howling walkie-talkie described in this embodiment, including a first device 1 and a second device 2 connected to the first device 1 for receiving the voice signal of the first device 1 .

[0039] In one embodiment of the present invention, the first device 1 and the second device 2 are connected through a voice signal line 3, the first device 1 is used to pick up the voice signal of people speaking, and output the voice signal to the second device through the voice signal line 3 After device 2 performs signal processing, it is output as an external intercom signal.

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PUM

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Abstract

The invention discloses a short-distance howling-free interphone and an intercommunication system, the short-distance howling-free interphone comprises a first device and a second device for receiving a pickup signal of the first device, and the first device comprises a shell and a microphone arranged at a central position; the shell comprises a front cavity and a rear cavity, pickup holes and air guide holes are distributed in the surfaces of the front cavity and the rear cavity respectively, the air guide holes correspond to the microphone and the pickup holes, and the front cavity, the rear cavity and the microphone jointly form the super-heart strong-directivity pickup; the second equipment comprises a shell, a circuit module and an audio output module, and the circuit module receives a pickup signal of the first equipment and an external input talkback signal and outputs the input signal after howling processing; the short-distance howling-free intercom system at least comprises two short-distance howling-free interphones which are respectively used as a host and a sub-machine. According to the invention, the interphone does not cause howling and noise interference due to echo and reverberation in a micro-close-range scene voice dialogue.

Description

technical field [0001] The invention relates to the field of walkie-talkie technology, in particular to a short-distance non-howling walkie-talkie and a walkie-talkie system. Background technique [0002] Currently, in an audio device, due to factors such as a collection method of the audio device, there is howling in the collected audio signal. For example, in a sound reinforcement system, the audio signal received by the microphone is amplified by the power amplifier and then output by the speaker, and the output signal may be received by the microphone again after reflection and / or refraction, forming a positive feedback loop. According to the Nyquist stability criterion, some frequency points may produce uniform oscillations, resulting in the continuous increase of the power of the audio signal of the public address system, the system is unstable, and the phenomenon of acoustic feedback may occur. As a result, the audio device emits unpleasant sounds, and the audio sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/38H04R3/02H04R3/04
CPCH04B1/38H04R3/02H04R3/04Y02D30/70
Inventor 吕文武庞坤谈淑琼
Owner 海宁鐵三角科技有限公司
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