Transceivers for single channel carrier telephone systems

Details Transceivers for single channel carrier telephone systems Transceivers for single channel carrier telephone systems

1975-12-05

1977-06-07

Pitts, Harold I.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

325405, 333 14, 358174, H04B 116

Patent

active

040286282

ABSTRACT:
A single channel carrier system is disclosed in which carrier techniques are used to add a second private talking path on a normal telephone subscriber loop. A central office unit modulates the second subscriber's signal to an inaudible range while the remote subscriber's unit demodulates this signal to recover the voice signal. The same process is used in the opposite direction utilizing a different carrier frequency.
Each unit includes a carrier receiver having automatic gain control circuits and a variable attenuation circuit. The automatic gain control circuit includes a direct current clamp to minimize excursions of the AGC signal in the absence of a received carrier. The variable attenuation circuit uses a diode bridge shunting the signal path and controlled by the AGC signal. A linear carrier oscillator is implemented by providing a constant current source of oscillation energy.

REFERENCES:
patent: 2328951 (1943-09-01), Bryant
patent: 2387652 (1945-10-01), Dickieson
patent: 2558002 (1951-06-01), Ross
patent: 3569620 (1971-03-01), Baun
patent: 3823379 (1974-07-01), George
patent: 3838210 (1974-09-01), Peil

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