Power converter
AssigneeBell Telephone Laboratories, Incorporated
InventorPeter Otto Schuh
Life of this patent
Estimating the term…
Abstract
In a two-wire bidirectional telephone transmission line, a power converter and a directional threshold detector form in combination an impedance transparent bilateral voice-signal controller which can supply stable voice-switched gain to a dominant signal originating from either direction and a simultaneous, equal loss to any signals propagating from the other direction without separating the respective signals.
Claims8
A bilateral AC-signal controller suitable for use in the two-wire portion of a telephone transmission line comprising:
- a. a power converter disposed in said two-wire line, and
- b. a directional threshold detector serially disposed in said two-wire line and adapted to supply a control signal to said power converter in response to the direction of AC-signal flow in said two-wire line.
A power converter comprising in combination:
- a first operational amplifier having a first impedance element connected between an output terminal and an inverting input terminal of said first amplifier;
- a second operational amplifier having a second impedance element connected between an output terminal and a noninverting input terminal of said second amplifier;
- a first biasing means connecting the output terminal of said first amplifier to an inverting terminal of said second amplifier;
- and
- a second biasing means connecting a noninverting terminal of said first amplifier and the noninverting terminal of said second amplifier with a ground source of reference potential.
A power converter comprising in combination:
- a first operational amplifier having a first impedance element connected between an output terminal and an inverting input terminal of said first amplifier;
- a second operational amplifier having a second impedance element connected between an output terminal of said second amplifier and a noninverting input terminal of said first amplifier;
- a first biasing means connecting the inverting terminal of said first amplifier and an inverting terminal of said second amplifier with a ground source of reference potential;
- and
- a second biasing means connecting the output terminal of said second amplifier to a noninverting terminal of said second amplifier.
Dependencies are inferred from the claim text.