2000 Volume 120 Issue 6 Pages 887-894
This paper presents a time-frequency distribution which is suitable for a signal analysis. It is difficult to obtain a high resolution in both time and frequency domains in the time-frequency analysis of the signal. However, the multiple short-time Fourier transform (NISTFT) is proposed as a means which obtains high resolution in both time and frequency domains. Further, it is extended to achieve higher resolution signal analysis using multiple expression of the MSTFT. The diagnosis of rotating condition of the pumps is attempted with driving sound using several expressions of time-frequency distributions based on the MSTFT.
The transactions of the Institute of Electrical Engineers of Japan.C
The Journal of the Institute of Electrical Engineers of Japan