Circuit for controlling an on-hook voltage by the use of a balan

Details Circuit for controlling an on-hook voltage by the use of a balan Circuit for controlling an on-hook voltage by the use of a balan

1996-09-16

1998-10-06

Hunter, Daniel S.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379399, 379395, H04M 100

Patent

active

058189270

ABSTRACT:
In an on-hook voltage control circuit for controlling an on-hook voltage by the use of an balanced amplifier producing a first and a second output signal which are equal in amplitude to each other and inverted in polarity from each other, a first signal producing circuit uses only the first and the second output signals to produces a first input signal supplied to the balanced amplifier. A first processing circuit processes the first output signal into a first processed signal by the use of a first reference signal. A second processing circuit processes the first processed signal into a second processed signal with an attenuation of the first processed signal. By the use of the first output, the second output, and the second processed signals, a second signal producing circuit produces a second input signal supplied to the balanced amplifier. The balanced amplifier amplifies the first and the second input signals to produce the first and the second output signals.

REFERENCES:
patent: 3688129 (1972-08-01), Ishigaki et al.
patent: 3973082 (1976-08-01), Van der Plaats
patent: 4254305 (1981-03-01), Treiber
patent: 4600811 (1986-07-01), Hayashi et al.
patent: 4723280 (1988-02-01), Meier et al.
patent: 4727578 (1988-02-01), Molnar
patent: 4760595 (1988-07-01), Arai
patent: 5323461 (1994-06-01), Rosenbaum et al.
patent: 5568547 (1996-10-01), Nishimura

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