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Circuit for eliminating background noise of fire protection system and control method thereof

A technology of background noise and fire protection system, which is applied in the field of fire telephone and fire broadcast, and can solve problems such as the decline of call quality and self-excitation phenomenon

Active Publication Date: 2019-01-18
SHENZHEN TANDA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a circuit for eliminating background noise in a fire protection system, aiming at solving the problems in the traditional technical solution that the background noise causes the call quality to decline and causes self-excitation phenomenon

Method used

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  • Circuit for eliminating background noise of fire protection system and control method thereof
  • Circuit for eliminating background noise of fire protection system and control method thereof
  • Circuit for eliminating background noise of fire protection system and control method thereof

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] Such as figure 1 Shown is a schematic structural diagram of a fire-fighting system background noise elimination circuit according to an embodiment of the present invention, a background noise elimination circuit applied to a fire-fighting system, the circuit includes: a filter unit 10, a signal amplification unit 20, a reverse unit 30, and an integration unit 40 and output unit 50 .

[0033] The filter unit 10 is used to filter the input audio signal. The filter unit 10 includes a DC filter module 11 and a DC input module 12. The DC filter module 11 is connected to the DC input module 12. T...

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PUM

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Abstract

The invention belongs to the field of fire broadcasting and fire telephone, and provides a circuit for eliminating background noise and a control method thereof. The circuit comprises a filter unit, wherein the filter unit is used for filtering and processing an input audio signal and inputting a direct current component; A signal amplifying unit connected with the filter unit, configured to amplify the filtered audio signal and output a first signal; An inversion unit connected to the signal amplification unit for inverting the first signal and outputting a second signal; An integrating unitconnected with the signal amplifying unit and the reverse unit, and integrating the first signal and the second signal to obtain an integrated signal; An output unit is connected to the integrating unit, compares the integrated signal with a preset threshold voltage, and outputs a control signal according to the comparison result to control the output of the audio signal.

Description

technical field [0001] The invention belongs to the fields of fire broadcasting and fire telephones, and in particular relates to a circuit for eliminating background noise and a control method thereof. Background technique [0002] In the event of a fire accident, in order to help people understand the scene in a timely manner, or help managers evacuate the crowd at the scene, it is necessary to broadcast evacuation information through the fire broadcast system and notify the scene through the fire telephone system. [0003] Because there will be a certain amount of background noise in the use environment, whether it is for the sender or the receiver, when there is background noise, it will have a certain impact on the quality of the sound. In the telephone system, the background noise will degrade the quality of the call , Excessive background noise in the broadcasting system will cause self-excitation and other phenomena. Contents of the invention [0004] The purpose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208H04M1/19
CPCG10L21/0208H04M1/19
Inventor 宋佳城万跃敏靳东风秦志军刘子健
Owner SHENZHEN TANDA TECH
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