Audio amplification circuit and working method thereof

A technology of audio amplification circuit, working method, applied in improving amplifier to reduce noise influence, measuring pulse/heart rate, etc.

Pending Publication Date: 2018-05-22
SHENZHEN JUMPER MEDICAL EQUIPMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the MCU method is used to remove the background noise, depending on the MCU, there will be a certain delay in the restoration of the fetal heart rate, and there will be a certain distortion

Method used

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  • Audio amplification circuit and working method thereof
  • Audio amplification circuit and working method thereof

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Embodiment Construction

[0022] In order to facilitate the understanding of the present invention, the following will describe the present invention more fully. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

[0024] see figure 1 , is an audio amplifier circuit 100 according to a preferred embodiment of the present invention, which is used to amplify the fetal sound signal in the original signal. The audio ...

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Abstract

The invention relates to an audio amplification circuit and a working method thereof. The audio amplification circuit comprises a signal amplification module, and a loudspeaker which is connected withthe signal amplification module; the signal amplification module comprises a detection module and a power amplifier unit connected with the detection module; the signal amplification module is provided with a main input end, a valve value input end and a reference end; the detection module is respectively connected with the main input end, the valve value input end and the reference end; the power amplifier unit is provided with a mute control end and an audio input end; the mute control end of the power amplifier unit is connected with the detection module, and the audio input end of the power amplifier unit is connected with the main input end of the audio amplifier circuit. According to the audio amplification circuit and the working method thereof, whether an original signal containsa tire sound signal or not is judged in a hardware mode through the detection module; the power amplifier unit can adjust the working state in time according to the voltage level of the mute control end of the power amplifier unit, so that the audio amplification circuit can amplify the tire sound signal in time, and meanwhile, the bottom noise in the original signal is filtered.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to an audio amplifier circuit and its working method. Background technique [0002] As a portable medical electronic instrument, ultrasonic fetal sound instrument is widely used in medical institutions or families, and is an important instrument for monitoring fetal heartbeat. Ultrasonic fetal sound monitors generally work based on the principle of Doppler ultrasonic detection, but due to the principle of Doppler ultrasonic detection and the inherent characteristics of the circuit, when there is no fetal heart signal, there will be inherent noise of the circuit output to the speaker, which is called floor noise. The conventional method of removing this kind of background noise is to use the ADC sampling of the MCU to sample the input signal, and then judge whether it is a fetal heart signal or background noise. If it is a fetal heart signal, perform oversampling, and then restore the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26A61B8/02
CPCH03F1/26A61B8/02
Inventor 高勇杰易辉
Owner SHENZHEN JUMPER MEDICAL EQUIPMENT CO LTD
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