Enhancement of speech signals transmitted over a vocoder channel

Details Enhancement of speech signals transmitted over a vocoder channel Enhancement of speech signals transmitted over a vocoder channel

1998-09-21

2000-06-27

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704207, 704205, 704228, G10L 1902

Patent

active

060817771

ABSTRACT:
In a vocoder system, the receiver is arranged to emphasize at least the fundamental or lowest-frequency sinusoidal signal in response to the pitch, in a manner which provides more emphasis at lower pitch values, corresponding to larger pitch intervals. The emphasis provides a subjectively improved speech synthesis. In a preferred embodiment, the enhancement takes place at fundamental component frequencies below 400 Hz. According to another aspect of the invention, the second and third harmonics are also emphasized, but generally not as much as the fundamental component. Below certain frequencies, the enhancement is limited for the fundamental and the harmonics.

REFERENCES:
patent: 3624302 (1971-11-01), Atal
patent: 5696875 (1997-12-01), Pan et al.
Bernard Sklar, Digital Communications Fundamentals and Applications, pp. 15-16, 29-30, 650-652, Oct. 1987.
Herbert Taub, Principles of Communication Systems, pp. 120-121, Jan. 1986.

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