Two-path telephone line equalization system

Details Two-path telephone line equalization system Two-path telephone line equalization system

1976-03-03

1977-03-08

Gensler, Paul L.

Wave transmission lines and networks

Coupling networks

Equalizers

179 25R, 179 16AA, H03H 714, H04M 700

Patent

active

040115305

ABSTRACT:
A two-path equalizer system interposable in a telephone line carrying supervisory signals whose frequencies lie below a 3 KHz limit and data signals whose frequencies primarily lie above this limit. The system normally operates in a first path mode with respect to incoming supervisory signals, the gain in the first path being preset to a degree depending on line losses, whereby the levels of supervisory signals emerging from the output of the system are at their nominal telephone line levels. An automatic path selector is provided which is responsive only to data signal frequencies and acts to switch-over the system and render it operative in a second path mode in which incoming data signals are subjected to automatic gain control and appear at the output at their maximum line level despite variations in input level.

REFERENCES:
patent: 2859413 (1958-11-01), Ketchledge

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