Method and apparatus for controlling the use of discontinuous tr

Details Method and apparatus for controlling the use of discontinuous tr Method and apparatus for controlling the use of discontinuous tr

1996-12-21

1998-04-07

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

455403, 455517, 455524, 455561, 455436, 395 235, 370442, 331110, H04B 146

Patent

active

057376956

ABSTRACT:
A method and apparatus for controlling the use of discontinuous transmission in a cellular telephone. The preferred embodiment of the present invention includes a voice activity detector for detecting the presence or absence of speech and an energy detector for measuring the energy level of sound input to a microphone of a cellular telephone during the absence of speech. The present invention also includes a comparator for comparing the measured noise energy level against a threshold value. The determination as to the presence or absence of speech and the output of the comparator are provided to a controller. The controller enables discontinuous transmission when the energy level detected during the absence of speech is less than or equal to the threshold value and disables discontinuous transmission when the measured energy level exceeds the threshold value.

REFERENCES:
patent: 5239557 (1993-08-01), Dent
patent: 5475712 (1995-12-01), Sasaki
patent: 5612955 (1997-03-01), Fernandes et al.
patent: 5619566 (1997-04-01), Fogel
patent: 5625687 (1997-04-01), Sayre, III
patent: 5630016 (1997-05-01), Swaminathan et al.
IEEE Global Telecommunications Conference & Exibition; Globecom 1989; vol. 2, 27-30 Nov. 1989, Dallas, Texas; pp. 1070-1074, XP000091191; Southcott et al.; "Voice Control of the Pan-European Digital Mobile Radio System" pp. 1070, col. 2--p. 1071, col. 1, line 7.

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