When a composite signal that seems to have an irregular pattern is analyzed using Fast Fourier Transform (FFT), certain patterns can be identified and frequency spectrum analysis becomes possible.
This technique is particularly effective for examining an audio signal, and it is also widely used in acoustic and vibration signal analysis for applications such as quality evaluation of automobiles or electrical household goods, detection of unusual sounds that are indicative of problems, etc.
The time waveform for the number of samples (number of FFT analysis points) is displayed. When time waveform recording was carried out, the waveform for the entire recorded period can be displayed, and secondary processing of various parameters from the recorded waveform is also possible.