Telephone set and system utilizing frequency division multiplexi

Details Telephone set and system utilizing frequency division multiplexi Telephone set and system utilizing frequency division multiplexi

1976-04-06

1977-06-21

Claffy, Kathleen H.

179 25R, H04J 106

Patent

active

040313271

ABSTRACT:
The telephone set comprises a programmable carrier generator which supplies the same variable frequency to an amplitude modulator receiving the local voice signals, and to a synchronous demodulator which makes it possible to reconstitute, without band pass filtering, the voice signals of any set with which it is communicating among those of other sets. The double side band amplitude modulated signals supplied by each set are frequency-division multiplexed on one of the two ways of a telephone artery, the other way of which distributes them to the sets after conversion of all the carrier frequencies into conjugate frequencies thereof. The programmable generators of the calling and called users in communication are respectively tuned to the frequencies of such a pair of conjugate frequencies.

REFERENCES:
patent: 3809815 (1974-05-01), Reed
patent: 3864521 (1975-02-01), DeLong

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