Process for detecting the melody frequency in a speech signal an

Details Process for detecting the melody frequency in a speech signal an Process for detecting the melody frequency in a speech signal an

1981-11-04

1984-04-17

Kemeny, E. S.

Boots, shoes, and leggings

381 49, G10L 100

Patent

active

044438575

ABSTRACT:
The process uses a set of data characteristic of the speech signal, supplied by processing circuits: measurements of the time intervals between zero crossovers and measurements of the energy in the half-waves of this signal. The test procedure implemented by a microprocessor selects the half-waves whose energies exceed thresholds characterizing pitch period beginnings. These thresholds are predetermined for the first two successive sums selected, then depend on the energy values of the preceding half-waves selected differently according as to whether the voiced character of the signal is acquired or not. Complementary tests are used for minimizing detection errors.

REFERENCES:
patent: 3573612 (1971-04-01), Scarr
patent: 4001505 (1977-01-01), Araseki et al.
patent: 4015088 (1977-03-01), Dubnowski et al.
patent: 4061878 (1977-12-01), Adoul et al.
Rabiner, et al., "A Comparative Performance Study . . . ", IEEE Trans. on Acoustics, etc., Oct. 1976.

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