Speech pitch period extraction apparatus

Details Speech pitch period extraction apparatus Speech pitch period extraction apparatus

1980-09-26

1983-06-14

Kemeny, Emanuel S.

Boots, shoes, and leggings

364724, G10L 100

Patent

active

043884911

ABSTRACT:
A speech pitch period extracting apparatus includes an amplitude classifying and coding circuit for classifying and coding the amplitude of a selected frame of a speech waveform signal to be analyzed into at least three levels of coded data, and a coincidence circuit for detecting the number of coincidences which occur between sets of coded data signals from said selected frame separated by different arbitrary time intervals, thereby to determine that time interval for which the maximum number of code coincidences between data signals occurs and to identify that time interval as the pitch period of the speech waveform signal. In addition, there may be provided a circuit for normalizing the speech waveform signal included in the frame to be analyzed, in accordance with the maximum peak value of the speech waveform, the speech waveform signal after being normalized is applied to the classifying and coding circuit.

REFERENCES:
patent: 4081605 (1978-03-01), Kitiwaki et al.
patent: 4161625 (1979-07-01), Katterfeldt et al.
Rabiner, et al., "A Comparative Performance Study etc.", IEEE Trans. Acoustics, Speech etc., Oct. 1976, pp. 399-418.

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