Speech amplifier-resident mechanism for controllably...

Details Speech amplifier-resident mechanism for controllably... Speech amplifier-resident mechanism for controllably...

2006-09-05

2006-09-05

Swerdlow, Daniel (Department: 2615)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S324000, C379S377000

Reexamination Certificate

active

07103178

ABSTRACT:
A voltage-coupling and loop current supply mechanism controllably turns on an output transistor within the tip amplifier circuitry portion of the speech amplifier to controllably apply a prescribed voltage to the telephone line during on-hook/standby mode. This controllably applied voltage serves as a source of loop current when the phone goes off-hook. The ring lead portion of the tip/ring wireline pair is connected to a controlled current sink, which is coupled to the output of a voltage regulator referenced to the battery voltage. This controlled current sink is used to sink a prescribed loop current from the tip/ring pair when the phone goes off-hook. When the phone goes off-hook and loop current is detected, the voltage-supply mechanism provided by the tip amplifier's output transistor is terminated, and the speech amplifier is placed in its normal speech amplifier mode.

REFERENCES:
patent: 4709388 (1987-11-01), Defretin
patent: 4866768 (1989-09-01), Sinberg
patent: 4961222 (1990-10-01), Johansson et al.
patent: 5557672 (1996-09-01), Perry et al.

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