Power-supply transfer apparatus for telephone

Details Power-supply transfer apparatus for telephone Power-supply transfer apparatus for telephone

1987-10-06

1990-04-10

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379387, H04M 1908

Patent

active

049167359

ABSTRACT:
The invention is directed to a prower-supply transfer apparatus for a telephone wherein the power supply is fed from a telephone line by a power supply transferring circuit when the operation has been decided as a low speed operation by a speed deciding circuit, the power supply is fed from a separate power supply circuit by the power-supply transferring circuit when the operation has been decided as the high speed operation, so that the low-speed operation is performed through the speed control by the speed decision result not only when the processing may be performed even at the low speed operation in the common telephone or the like, but also when the high-speed processing is required in voice recognition or the like.

REFERENCES:
patent: 4232200 (1980-11-01), Hestad et al.
patent: 4578540 (1986-03-01), Borg et al.
patent: 4585904 (1986-04-01), Mincone et al.
patent: 4670628 (1987-06-01), Boratgis et al.
"Bridging the Worlds of the Deaf and Hearing", G. A. Abbink, Telephony, May 24, 1982, pp. 76-80.

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