Pitch period extracting apparatus of speech signal

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

1995-05-23

1998-10-06

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704208, 704216, 704217, 704218, G10L 302, G10L 900

Patent

active

058192093

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.ltoreq.k.ltoreq.100 samples in a case of 8 kHz, and a range of 15 samples.ltoreq.k.ltoreq.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, pp. 146-156, Jun. 1978.
Article:Digital Processing of Speech Signal; Author: Lawrence R. Rabiner and Ronald W. Schafer, Published by: Prentice-Hall, Inc.-1978; 12 pages.

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