1977-04-14
1978-02-21
Claffy, Kathleen H.
G10L 100
Patent
active
040754235
ABSTRACT:
Sound Analyzing Apparatus is described for extracting from a speech signal certain basic formant waveforms present in the signal and then examining the formant waveforms to identify the frequency components of the waveforms, using a histogram format in a digital processor. This frequency analysis is accomplished by rectifying the formant waveform, detecting the occurrence of peaks in the resultant waveform and evaluating the time intervals between successive peaks. The apparatus is also biased to reject as invalid those time intervals when peaks of less than a predetermined magnitude occur. Since the formant waveform is typically a succession of damped waves, the frequencies detected are classified into ranges and a running average of the allocation of the frequency components over the ranges is developed over successive sampling periods in order to provide a histogram output illustrative of the final analysis.
REFERENCES:
patent: 3941982 (1976-03-01), Knollenberg et al.
M. Schroeder, "Period Histogram etc.," J. of Ac. Soc. Am., vol. 43, No. 4, 1968.
Martin Michael Joseph
Underwood Michael John
Claffy Kathleen H.
International Computers Limited
Kemeny E. S.
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