Speech signal transmission method providing for control

Details Speech signal transmission method providing for control Speech signal transmission method providing for control

1994-05-10

1996-09-03

MacDonald, Allen R.

395 228, 395 235, G10L 302

Patent

active

055531903

ABSTRACT:
A method of communicating a speech signal over a communication medium which utilizes VOX (Voice Operated Transmitter) control, and a speech signal transmitting unit and a speech signal receiving unit used in said method. The speech signal includes at least one speech-active duration in which actual speech exists and one silent duration in which no actual speech exists. At a transmitting side, the speech signal is analyzed for each of successive frames thereof to determine whether each frame is in the speech-active duration, and is coded for each of successive frames thereof to produce a series of successive coded data of the speech signal. Then, in response to the detection of a speech starting frame of the speech-active duration, the coded data of the speech starting frame is switched to a preamble, and the preamble and the successive coded data subsequent to the speech starting frame are transmitted in the form of a series of successive frames. At a receiving side, the preamble is detected and the decoded results of the coded actual speech data subsequent to the detected preamble are output as a speech signal. When a predetermined number of successive coded actual speech data have been detected without having detected a preamble preceding thereto, it is decided that the decoded results of the coded actual speech data are in a speech-active duration and the decoded results are outputted as a speech signal.

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patent: 5483556 (1996-01-01), Pilan et al.
Patent Abstracts of Japan, No. 14234 (E-0929), May 17, 1990, JP-A-2062135 (NTT).
Lin et al., Error control Coding: Fundamentals and Applications, Prentice Hall, 1989, pp. 58, 59, 81 and 98.
Furui, Digital Speech Processing, Synthesis, and Recognition, Tokai University Press, 1985, pp. 85-86.

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