Electronic telephone

Details Electronic telephone Electronic telephone

1979-07-26

1982-10-12

Popek, Joseph A.

179 81A, H04M 100, H04M 158

Patent

active

043540600

ABSTRACT:
An electronic telephone employing transmit and receive solid-state amplifiers having sufficiently low DC resistance to be biased by a DC signal over a pair of conductors with substantially less than four volts and having sufficiently high AC impedance for transmitting AC communication signals over and receiving AC communications from that pair of conductors. The amplifiers are directly coupled to the conductors, and the amplifiers include a transmitter section comprising a microphone and first solid state amplifier coupling the microphone to the pair of conductors, and a receiver section comprising a speaker and a solid state amplifier coupling the speaker to the pair of conductors. A shunt circuit is connected across the pair of conductors to adjust impedance characteristics of the telephone responsive to the available DC bias. A DC feedback circuit has an input coupled across the pair of conductors and an output coupled to the solid-state amplifiers, to provide a stable reference voltage to the solid-state amplifiers.

REFERENCES:
patent: 3955053 (1976-05-01), Picard
patent: 3987254 (1976-10-01), Pipitone
patent: 4071713 (1978-01-01), Seneer
patent: 4133983 (1979-01-01), Moore
Microelectronics Opens New Prospects for Station Apparatus, by Keith Richardson, Telephony, vol. 184, No. 12, Mar. 19, 1973, pp. 51-55.
P. Luff, "The Electronic Telephone Emerges", Telesis, vol. 5, No. 7, Feb. 1978, pp. 194-200.
R. E. Holtz et al., "An Experimental Electronic Telephone", presented at N. E. C., Dec. 1969, by Bell Telephone Labs.
K. E. Preece, "Electronics In Subscribers Apparatus", Nov. 1976, by ITT.
J. Needham et al., "Digipulse; Electronics for the Home Telephone", Telesis, 1976, pp. 280-283.
"Electronic Phones on Trial", Telesis, Jun. 1978.

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