Method and apparatus for detecting speech

Details Method and apparatus for detecting speech Method and apparatus for detecting speech

1991-04-23

1992-09-29

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Carrier amplitude control

381 47, H01Q 1112, H04M 1104

Patent

active

051520079

ABSTRACT:
A method of generating a first signal (115) in a radiotelephone (101) representing the detection of speech on a second signal having background noise, a magnitude, a zero crossing rate and divided in time by frames having a predetermined time period. In absence of speech, the method characterizes the background noise (209) and computes background noise thresholds (211). The method computes an average of the magnitude of the second signal and a zero crossing rate of the second signal for a given frame (215). Then, compares said average of the magnitude (217) and said zero crossing rate (221) of the second signal to said background noise threshold. Upon one of said average of the magnitude and said zero crossing rate consecutively exceeding said background noise thresholds for a first predetermined number of frames, the transceiver(107) is turned on.

REFERENCES:
patent: 3962553 (1976-06-01), Linder
patent: 4378603 (1983-03-01), Eastmond
patent: 4628529 (1986-12-01), Borth et al.
patent: 4811404 (1989-03-01), Vilmur et al.
patent: 4905288 (1990-02-01), Gerson et al.
patent: 4959865 (1990-09-01), Stettiner et al.
An Algorithm for Determining the Endpoints of Isolated Utterances, L. R. Rabiner and M. R. Sambur. The Bell System Technical Journal vol. 54, No. 2, Feb. 1975. This article refers to the use of zero crossing rate and average amplitude in detecting speech data from background noise.

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