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.