Telephone having separate power circuit for supplying power to s

Details Telephone having separate power circuit for supplying power to s Telephone having separate power circuit for supplying power to s

1993-06-07

1994-12-13

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379413, 379348, 379344, H04M 1900

Patent

active

053735544

ABSTRACT:
A telephone includes a speech network for transmitting an outgoing voice signal and receiving an incoming voice signal from a remote telephone. The speech network is not supplied with power from a telephone exchange through a telephone line but supplied with a separate power supply. To interrupt the power supply from the telephone exchange, a transformer is interposed between the speech network and the telephone line. A ringer circuit and a dialer circuit are connected to the primary side of the transformer. Because the power supplied to the speech network does not fluctuate, the circuit design of the speech network can be readily performed using inexpensive circuit components.

REFERENCES:
patent: 4064366 (1977-12-01), Whentley et al.
patent: 4272650 (1981-06-01), Bolgiano et al.
patent: 4497980 (1985-02-01), Gorman et al.
patent: 4647787 (1987-03-01), Pommer, II
patent: 4951002 (1990-08-01), Hanon
patent: 4961220 (1990-10-01), Tentler et al.
patent: 4984267 (1991-01-01), Mortinez
patent: 5136630 (1992-08-01), Breneman et al.

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