SOME THEORETICAL AND EXPERIMENTAL ASPECTS OF ANALYSIS WITH THE SOUND SPECTROGRAPH.
MICHIGAN UNIV ANN ARBOR COMMUNICATION SCIENCES LAB
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Before the introduction of the sound spectrograph in 1946, analysis of complex audio phenomena, such as speech, into time, frequency, and amplitude coordinates depended for the most part on a very time-consuming Fourier analysis of an oscillographic record of the event. The techniques introduced with the sound spectrograph permitted the speeding-up of the analysis procedure by a large factor. These techniques and their underlying principles are discussed. The use of a bank of filters to accomplish real-time speech analysis is not discussed, but that form of the sound spectrograph which achieves frequency analysis by sweeping the spectrum of the recorded signal past a single analyzing filter is discussed in detail. A sound spectrograph developed at the Communication Sciences Laboratory of the University of Michigan is then described, and samples of work with the machine are shown. This instrument includes some novel features, such as the automatic marking on the spectrogram of time, frequency, and amplitude scales. Author
- Non-Radio Communications