1984-10-19
1986-08-26
Dwyer, James L.
179 81R, H04M 160
Patent
active
046084622
ABSTRACT:
An integrated circuit for a telephone instrument provides the basic (POT) service requirement. The transmit and receive channels of the circuit may be fed via controlled attenuators incorporated in a first ancillary circuit to provide hands-free operation. The circuit also includes a current-limited power supply whereby connection to a second ancillary circuit, including an audio amplifier, may be effected to provide loudspeaker operation.
REFERENCES:
patent: 4002854 (1977-01-01), Penrose
Terai et al., "Network Realization for the Small Size Telephone Set", Review of the Electrical Communication Lab., vol. 22, No. 3-4, pp. 227-235, Mar.-Apr. 1974.
Arton Kenneth A.
Blomley Peter F.
Lefevre Andrew P.
Whittaker Edward J.
Dwyer James L.
International Standard Electric Corporation
O'Halloran John T.
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