Telephone line interfacing circuit with directional transfer of

Details Telephone line interfacing circuit with directional transfer of Telephone line interfacing circuit with directional transfer of

1977-09-07

1978-09-19

Robinson, Thomas A.

179 18HB, 179 84R, H04M 318

Patent

active

041156609

ABSTRACT:
A circuit for interfacing an AF line to a central unit makes use of an RF transformer Tr. Said transformer is so arranged that the source AF signal to be transmitted modulates an RF carrier generated in a primary winding of the transformer and the resulting modulated signal in the secondary winding is demodulated before being transmitted to a line which is thereby linked to the source.

REFERENCES:
patent: 2794857 (1957-06-01), Doriot
patent: 3491207 (1970-01-01), Birck
patent: 3577202 (1971-05-01), Brightman
patent: 4011410 (1977-03-01), Thomas

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