Digitized acoustic detection system

Abstract

The invention discloses a digitized acoustic detection system, which comprises a microphone, a front end circuit, an analog-to-digital (A / D) converter, a signal processor, a touch screen and a keyboard. After the microphone converts an acoustic signal into an electric signal, the signal is input into the front end circuit. After the front end circuit amplifies the signal, the electric signal is input into the A / D converter for analog-to-digital conversion. The converted signal is input into the signal processor for signal processing. The touch screen and the keyboard are connected with the signal processor. A calibration module, a sound level measuring module, a spectrum analysis module and a fast Fourier transform (FFT) analysis module are arranged in the signal processor, wherein the calibration module is used for channel calibration and microphone calibration; the sound level measuring module supports A, C and Z frequency weighting; the spectrum analysis module is used for conducting real-time measurement by using 1 / 1 and 1 / 3 octave frequency bands within an allowable wide frequency range; and the FFT analysis module is used for measuring the transient sound level, the maximum sound level and the minimum sound level of the selected frequency range. The digitized acoustic detection system has the advantages that the basic detection of various sound levels and sound intensity calculation can be realized, the real-time spectrum and statistical analysis can be conducted to sound vibration signals, the sound vibration signals can be automatically monitored, the data redundancy of low-frequency parts is reduced and the spectrum leakage is reduced through windowing.

Description

technical field [0001] The present invention is an integrated digital acoustic analysis system, specifically a system that adopts digital processing technology to obtain various acoustic measurement items, has the characteristics of high precision, strong expandability, and low cost, and can be widely used in acoustic vibration signal detection and within the field of analysis. Background technique [0002] The existing acoustic detection system has low precision, poor expandability and high cost. For example, B&K Company, as a leading company in the acoustic measurement industry, manufactured the world's first hand-held sound level meter, model 2203, in 1960, and began the development of a portable acoustic signal analysis system. However, this Model 2203 sound level meter has very few functions, no pulse time constant measurement and no peak detection. With the development of signal theory and large-scale integrated circuits, the functions of acoustic analysis instrumen...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of low accuracy, poor expansibility, large amount of calculation and high cost of the existing acoustic detection system

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