A comparison of synchronous and asynchronous analysis of speech
Grant J. Jensen, William J. Strong · The Journal of the Acoustical Society of America · 1993
Speech having a high signal-to-noise ratio and digitized at 16 kHz was used for the comparison. An ‘‘ideal’’ synchronous analysis was obtained by handmarking the speech events—voicing periods, plosive bursts, and so on. An asynchronous analysis was obtained from 25-ms Hamming windowed segments of speech stepped at 7.5-ms intervals. In both cases the speech sample—event or windowed segment—was Fourier transformed and displayed in a ‘‘trispectral’’ space. The synchronous analysis produced erratic event-to-event spectra for short voicing periods. The asynchronous analysis produced erratic segment-to-segment spectra for long voicing periods. It also tended to smear short-duration, transitional features. Various examples of trispectral plots obtained from the two methods will be shown for comparison.