Noise detection circuit

Abstract

The invention discloses a noise detection circuit, and the circuit comprises a noise collecting module, a signal amplifying module and a weighting module, wherein the sound collecting module collectsa sound signal and inputs the sound signal into the signal amplifying module, and the signal amplifying module amplifies the sound signal and transmits the amplified signal to the weighting module. The weighting module performs the weighting processing of the amplified sound signal to obtain noise data, and outputs the noise data to a receiving port of a noise receiving device, wherein the weighting module is composed of a capacitor and a resistor. The beneficial effects are that a hardware circuit is used to replace the weighting operation, so that the sound signal can be converted into signal with the sound frequency being closer to the human ears through employing the hardware circuit, and there is no need to design complex software to optimize the circuit, thereby reducing the requirements for a controller during the collection of noise, achieving accurate measurement of noise; the advantage is that the computational performance requirements of the controller and the complexity ofthe software are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of noise sensors, in particular to a noise detection circuit. Background technique [0002] Noise measurement generally includes several parts such as radio reception, piezoelectric conversion, amplification, A / D sampling, FFT transformation, weighting operation, calibration, etc. Among them, radio reception, piezoelectric conversion, amplification and A / D sampling belong to the hardware circuit part, and FFT transformation , weighting and calibration are usually done by software algorithms, and the final noise data is obtained through the control unit. [0003] The function of the receiving part is similar to the human ear, which takes out the surrounding sound signal; the piezoelectric conversion is to convert the sound signal into a voltage signal or a current signal that can be processed by the circuit; the amplifying circuit part is to amplify and filter the converted electrical signal so that Carry ou...

AI Technical Summary

Problems solved by technology

[0004] Advantages and disadvantages of traditional measurement methods: accurate measurement results are its biggest advantage, and the disadvantage is that due to the need for more complex FFT transformation and weighting algorithms, it requires higher computing power for the control unit, generally requiring 16 or even 32 bits The high-speed controller is completed, and the software algorithm is more complicated

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