Computer-based sound spectrograph system.

Sound spectrographs based on digital computers are of interest because of the versatility they offer in generating and displaying sound spectrograms. A particular computer-based sound spectrograph is described in which digitized time waveforms stored on disk memory are spectrally analyzed and the resulting data stored back on disk for later display. Analyses are also performed to obtain the voicing fundamental frequency and the overall-intensity level of the signal which are displayed time registered with the spectrogram. While viewing the spectrographic display, the user is able to tailor the display before making hardcopy. This permits the user to specify a spectral threshold level, the dynamic range represented in the display, spectral contrast, and spectral emphasis.