Abstract
Instantaneous indication of the beginnings of individual pitch periods of a voiced-sound speech wave is often desirable in speech analysis. With conventional means, such as linear filtering and subsequent wave-form shaping, this instantaneous indication is very hard to achieve because of the considerable time delay involved. In the “instantaneous” pitch-period indicator the problem is solved by using non-linear techniques and a variable time-gating circuit; a pitch-period beginning is indicated by a marker pulse having a maximum delay of the order of five percent of the pitch-period duration. The application of the device to certain problems of speech analysis will be indicated.
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