Duplex microphone communication system

Details Duplex microphone communication system Duplex microphone communication system

1986-03-11

1987-09-01

Lev, Robert

Telephonic communications

Substation or terminal circuitry

Sidetone control or hybrid circuit

381122, H04B 320

Patent

active

046913491

ABSTRACT:
A full duplex microphone communications system permitting simultaneous bi-directional communications for a two conductor shielded microphone cable. A talkback signal is injected by an encoder at one end using a balanced input to transmit a common-mode signal on the two conductors of the microphone cable using the shield as a ground reference. This signal is then decoded at the other end of the cable by decoding circuitry which covers the common-mode talkback signal.

REFERENCES:
patent: 3775561 (1973-11-01), Guckel
patent: 3862364 (1975-01-01), Inose et al.
patent: 3983323 (1976-09-01), Griffith et al.
patent: 4006310 (1977-02-01), Bayer
patent: 4598396 (1986-07-01), Upp et al.

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