Radio telephone system with direct digital carrier modulation fo

Details Radio telephone system with direct digital carrier modulation fo Radio telephone system with direct digital carrier modulation fo

1979-01-09

1981-07-21

Wolff, John H.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455102, H04Q 704

Patent

active

042800200

ABSTRACT:
In a method of transmitting data and speech signals over a telephone system through which communication is effected via a radio link, the data and the speech signals are separated in the frequency domain, and are transmitted in respective separate sideband channels. The data sideband channel contains sidebands generated by time coding an otherwise continuous wave signal. The latter signal may be a carrier signal which is modulated to convey the speech signals.

REFERENCES:
patent: 2159647 (1939-05-01), Alford
patent: 3716790 (1973-02-01), Romoser
patent: 3806663 (1974-04-01), Peek et al.

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