Bilateral current source for a multi-terminal intercom

Details Bilateral current source for a multi-terminal intercom Bilateral current source for a multi-terminal intercom

1980-06-17

1982-11-09

Konick, Bernard

179 81B, H04B 158

Patent

active

043586449

ABSTRACT:
A bilateral current source operates as a two-wire to four-wire converter circuit for an intercom system. The circuit provides a high impedance current driver for putting a local voice signal on the common line connecting the intercom stations. The same circuit acts as a buffer amplifier for connecting voice signals received on the same line to a listening device such as a speaker. The circuit suppresses any sidetones by preventing the local voice signal from being coupled to the listening device.

REFERENCES:
patent: 3480742 (1969-11-01), Gaunt, Jr.
patent: 3751602 (1973-08-01), Breeden
patent: 4001524 (1977-01-01), Prudhon et al.
patent: 4192978 (1980-03-01), Vincent

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