Digital space phone system

Details Digital space phone system Digital space phone system

1982-10-08

1984-08-14

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

179 81B, 179100L, 358 85, H04M 1100

Patent

active

044659024

ABSTRACT:
A television receiver having two-way telephone capability includes a digitized talk channel and a digitized listen channel each having a gain-controlled amplifier selectively controlled by a switch controlled generator driven by the output of a subtraction circuit. Multipliers are connected to the inputs of the subtraction circuit and in turn receive respective inputs from their associated channels and from the other channels for offsetting cross coupled signals due to the telephone interface.

REFERENCES:
patent: 3660603 (1972-05-01), Andersen
patent: 3925618 (1975-12-01), Kato et al.
patent: 3953676 (1976-04-01), Brown
patent: 4338492 (1982-07-01), Snopko
patent: 4414432 (1983-11-01), Skerlos et al.

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