Electronic network for telephone set

Details Electronic network for telephone set Electronic network for telephone set

1978-01-06

1979-01-09

Robinson, Thomas A.

179170NC, H04M 158, H04B 338

Patent

active

041339835

ABSTRACT:
A line powered electronic network which utilizes a bridge configuration for connecting a microphone and receiver to a telephone line which provides increased line voltage during operation of an associated tone generator. The network is so constructed that the d-c voltage across the line is increased during operation of the associated tone generator so as to prevent clipping of the tone signals. Each of the d-c feedback paths around the amplifier of the network includes a plurality of R-C networks connected in cascade so as to provide sufficient filtering at low audio frequencies while meeting the overall time constant required for changing the d-c operating conditions of the set.

REFERENCES:
patent: 3462560 (1969-08-01), Holzman
patent: 3602648 (1971-08-01), Holtz et al.
patent: 3691311 (1972-09-01), Wilson
patent: 3899643 (1975-08-01), Tabalba
patent: 3963876 (1976-06-01), Holtz et al.
patent: 3987254 (1976-10-01), Pipitone
patent: 4071713 (1978-01-01), Sencer

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