Device for conveying a high-voltage low-frequency signal over a

Details Device for conveying a high-voltage low-frequency signal over a Device for conveying a high-voltage low-frequency signal over a

1977-12-29

1980-04-08

Konick, Bernard

179 251, H04M 126

Patent

active

041974336

ABSTRACT:
Ringing current is a high-voltage, low-frequency signal which is sent from a telephone exchange via a pair of wires to ring a bell in a distant telephone. It is becoming common practice for distant telephones to be connected via a carrier connection and the present invention provides a device for conveying a high-voltage low-frequency signal along such a carrier connection. The device comprises a sender part and a receiver part connected together by the carrier connection. The sender part on/off modulates one of the carrier frequencies used in the connection at twice the rate of the low-frequency signal. The receiver part detects the on/off modulation and uses it to connect alternate opposite voltages delivered by a voltage multiplier circuit to a line connected, for example, to a telephone bell.

REFERENCES:
patent: 3886321 (1975-05-01), Krasin et al.
patent: 3927266 (1975-12-01), Stewart et al.

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