Phone conference system

Details Phone conference system Phone conference system

1983-11-07

1986-08-12

Brown, Thomas W.

179 81B, H04M 160, H04M 356

Patent

active

046058230

ABSTRACT:
A phone conference system which includes a plurality of microphones and a speaker or speakers which are connected to a telephone. In the phone conference system, a required number of units are connected in cascade fashion. Each unit includes a speaker or speakers, connected via an amplifier to a receiving line, a preamplifier-mixer for unifying the outputs of the microphones, and a summing amplifier unifying the output of the preamplifier-mixer and the output a microphone or microphones from another unit.

REFERENCES:
patent: 3378639 (1968-04-01), Dufendach et al.
patent: 3824344 (1974-07-01), James et al.
patent: 3925618 (1975-12-01), Kato et al.
patent: 4008376 (1977-02-01), Flanagan et al.
patent: 4359606 (1982-11-01), Shoichi
patent: 4449238 (1984-05-01), Lee et al.

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