High-Speed Sound Spectrograph

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Abstract
A new sound spectrograph is described that incorporates many new and unique automatic features. The mechanical assembly includes a tape-handling system for continuous record and playback. An integral part of the mechanical assembly is a tape scanner and marking drum. The scanner can repeatedly scan any 2.4-sec segment of tape for spectrographic analysis, and the tape may be automatically advanced in sequence for analysis of continuous segments of the recording. A high speedup ratio enables a spectrogram to be made in 80 sec. Three basic types of spectrograms can be made: (1) the normal display of time versus frequency with intensity shown as blackness; (2) an amplitude-contour display; and (3) a cross-sectional amplitude display.

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