Anti-larsen-effect arrangement in a telephone station equipped w

Details Anti-larsen-effect arrangement in a telephone station equipped w Anti-larsen-effect arrangement in a telephone station equipped w

1983-06-07

1984-11-20

George, Keith E.

1791708, H04M 908

Patent

active

044840349

ABSTRACT:
An anti-Larsen circuit for a telephone station in which the listening channel comprises an automatic listening level control circuit, suitably of the type comprising a variable attenuator circuit, a pulse-width modulator and a threshold detector which supplies compression pulses. The transmission channel comprises a circuit for rendering the transmission channel operative or inoperative and also a control circuit. Actuation takes place above a sound-level threshold S.sub.1 and a de-activation below a sound-level threshold S.sub.2 which is smaller than S.sub.1.

REFERENCES:
patent: 3963876 (1976-06-01), Holtz et al.
patent: 4051325 (1977-09-01), Mafune et al.
patent: 4119797 (1978-10-01), Wollert
patent: 4161624 (1979-07-01), Brosow
patent: 4310831 (1982-01-01), Henderson et al.
Review of the Electrical Communication Laboratories, vol. 27, Nos. 5-6, May-Jun. 1979, pp. 347-367; "Model S-1P Loudspeaker Telephone Circuit Design", Kato et al.

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