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US 4,049,928 AGranted
Self-adjusting voice frequency repeater
AssigneeNorthern Telecom Limited
InventorIsrael Levi
Life of this patent
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Abstract
A self-adjusting voice frequency repeater for subscriber loops of varying ohmic resistances utilizing a multiplier-divider arrangement is disclosed.
Claims5
A self-adjusting voice-frequency repeater for subscriber loops having ohmic resistances between two predetermined values comprising, in combination:
- means for dividing a control signal proportional to the loop resistance by a temperature-stable d-c reference signal;
- multiplying means responsive to the output of the dividing means for multiplying said output by an input signal of said repeater;
- and buffer means responsive to said multiplying means for providing an output signal of said repeater, whereby a temperature generated error of said multiplying means is substantially cancelled by an opposite, temperature generated error of said dividing means.
Dependencies are inferred from the claim text.