Singing preventive system

Details Singing preventive system Singing preventive system

H - Electricity

04

B

363/12, 379/64,

H04B 3/20 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1109173

Abstract of the Disclosure In the case where a two-wire circuit forming a trunk or a line circuit of a two-wire system is converted by a hybrid circuit to a four-wire circuit having sending and receiving paths to form a transmission line between subscribers, if an impedance variation on the two-wire side is large, a leak from the sending path to the receiving path occurs and is amplified to cause singing. To eliminate the singing, a circuit for detecting the impedance fluctuation of the two-wire side is inserted in the two-wire circuit, and a switching device inserted in the four-wire circuit is activated by an impedance detecting signal of the detecting circuit to electrically open the four-wire circuit, thereby preventing the singing phenomena. This method does not involve the use of an expensive attenuator which is troublesome to design for preventing singing.

303547

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