Pitch period extracting apparatus of speech signal

Details Pitch period extracting apparatus of speech signal Pitch period extracting apparatus of speech signal

2005-11-22

2005-11-22

Knepper, David D. (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S208000, C704S216000, C704S217000, C704S218000

Reissue Patent

active

RE038889

ABSTRACT:
A pitch period extracting apparatus includes a microcomputer which determines a sampling frequency for an A/D converter, and a range of delay times for calculating autocorrelative values on the basis of the sampling frequency. For example, the delay times are set within a range of 20 samples≦k≦100 samples in a case of 8 kHz, and a range of 15 samples≦k≦75 samples in a case of 6 kHz. The microcomputer calculates the autocorrelative values of speech signal data stored in a buffer memory, and outputs a delay time at which a maximum autocorrelative value is obtainable as a pitch period of an inputted speech signal.

REFERENCES:
patent: 4653098 (1987-03-01), Nakata et al.
Rabiner L.R. Schafer RW, Digital Processing of Speech Signals, Jun. 1978, pp. 146-156.
Lawrence R. Rabiner and Ronald W. Schafer, Digital Processing of Speech Signals, Prentice-Hall, Inc., 1978, 12 pages.

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