ANTI-LARSEN-EFFECT ARRANGEMENT IN A TELEPHONE STATION EQUIPPED WITH A LOUDSPEAKER

ANTI-LARSEN-EFFECT ARRANGEMENT IN A TELEPHONE STATION EQUIPPED WITH A LOUDSPEAKER

An anti-Larsen circuit for a telephone station in which the listening channel comprises an automatic listening level control circuit comprising, a variable attenuator circuit, a pluse width modulator and a threshold detector which supplies compression pulses, the transmission channel comprising a ci...

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Bibliographische Detailangaben
Hauptverfasser: LEFORT, EMMANUEL, HAMEL, ROGER B.J, MOLIERE, FRANCOISE, FERRIEU, GILBERT M.M
Format: Patent
Sprache:eng ; fre
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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Beschreibung
Zusammenfassung:An anti-Larsen circuit for a telephone station in which the listening channel comprises an automatic listening level control circuit comprising, a variable attenuator circuit, a pluse width modulator and a threshold detector which supplies compression pulses, the transmission channel comprising a circuit for rendering the transmission channel operative or inoperative and also a control circuit, autuation of which takes place above a sound-level threshold S1 and a de-activation below a sound-level threshold S2 which is smaller than S1.