Frequency-division multiplexer for telephone transmission provid

Details Frequency-division multiplexer for telephone transmission provid Frequency-division multiplexer for telephone transmission provid

1974-08-16

1976-07-13

Claffy, Kathleen H.

H04J 106

Patent

active

039695859

ABSTRACT:
Multiplexer for telephone transmission coupling the calling channels containing supervisory information which are not premodulated to the premodulated conversation channels which contain the voice information, modulating the coupled channels to bring the conversation signals into the multiplex group and using a single extra modulation of the whole spectrum obtained after modulation of the coupled channels to re-position correctly the calling signals in the multiplex group.

REFERENCES:
patent: 3495188 (1970-02-01), Kopp

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