Patent
1982-08-16
1984-09-04
Rubinson, G. Z.
1791702, H04M 1106, H04B 320
Patent
active
044699166
ABSTRACT:
The presence of such signals is detected each time the following detection condition is satisfied, namely: that, for the duration of a predetermined "prior activity" period the amplitude of the signal on the telephone channel exceeds a threshold level while successive maximum values taken at short time intervals remain fairly constant in level. Apparatus for performing the method comprises a threshold level comparator (10) and a difference comparator (11) which control a detector (50) followed by a holdover circuit (60). The invention is particularly applicable to inhibiting echo suppressor circuits during telephone signalling or data transfer by telephone line.
REFERENCES:
patent: 3069501 (1962-12-01), Gilman et al.
patent: 3647993 (1972-03-01), Foulkes et al.
patent: 3859462 (1975-01-01), Saxon
patent: 3935403 (1976-01-01), Penicaud et al.
patent: 3979559 (1976-09-01), Roedel et al.
patent: 4352962 (1982-10-01), LaMothe
IEEE Transactions on Communications vol. COM-26 No. 1 Jan. 1978-New York, p. 142, paragraph 4, "Dynamic Speech Detector N. 1".
R. F. Frankeny, "Voice Detector Circuit"; IBM Technical Disclosure Bulletin, vol. 20, No. 4, Sept. 1977 pp. 1282-1283.
de Bergh Guy
Spiteri Jean-Claude
Compagnie Industrielle des Telecommunications Cit-Alcatel
George Keith E.
Rubinson G. Z.
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