Frequency channel units for a FDM system

Details Frequency channel units for a FDM system Frequency channel units for a FDM system

1977-01-10

1978-12-19

Claffy, Kathleen H.

H04J 106

Patent

active

041307330

ABSTRACT:
Each of the FDM frequency channel units of a FDM system include a physically programmable voltage controlled oscillator and a phase locked loop coupled therewith responsive to a reference signal or a physically programmable counter responsive to the reference signal. Each of these arrangements produce a carrier signal having a different predetermined frequency for each of a plurality of FDM frequency channel units. A balanced modulator modulates and transmits an associated one of the carrier signals with information and a balanced demodulator responsive to an associated one of the produced carrier signals demodulates an associated one of a plurality of received information bearing carrier signals.

REFERENCES:
patent: 3364311 (1968-01-01), Webb
patent: 3809815 (1974-05-01), Reed et al.
patent: 4024350 (1977-05-01), Deman

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