EXTRACTION OF INFORMATION FROM ACOUSTIC VIBRATION SIGNALS USING GABORTRANSFORM TYPE DEVICES

A technique for interpreting acoustic signals is presented based upon the use of Gabor type devices. This interpretation technique processes the information acquired from vibration sensors and presents the info rmation as three time-varying parameters which represent the dominant signal frequency, the nominal breadth of the frequency content of the signal and its effective energy content. The technique is an extension of the chromatic analysis used successfully in the optical domain. Th e information produced by this analysis proves to be more convenient f or defining a signal than that yielded by the conventional Fourier tra nsform approach. By way of an example, the Gabor transform based techn ique is applied to the monitoring of acoustic signals generated by a h igh-voltage circuit breaker (as used on power transmission networks). Results are presented which indicate that the technique is capable of quantifying trends in complicated time-varying acoustical signals.