An Instantaneous Pitch-Period Indicator
Ladislav O. Dolanský · The Journal of the Acoustical Society of America · 1955
Instantaneous indication of the beginnings of individual pitch periods of a voice-sound speech wave is often desirable in speech analysis. With conventional means, such as linear filtering and subsequent waveform 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 nonlinear 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 is indicated.