Telegraphy – Systems – Printing
Patent
1976-01-02
1977-01-11
Miller, Jr., Stanley D.
Telegraphy
Systems
Printing
178 691, 179 15BP, 307269, 325 49, 325329, 329 50, 329110, H03B 100, H04B 168, H03D 318
Patent
active
040029913
ABSTRACT:
A pilot signal extracting circuitry designed to extract, from a composite signal consisting of plural signals modulated by a suppressed carrier modulation system, a pilot signal for controlling the generation of a carrierwave which is used for the demodulation of the composite signal.
The pilot signal extracting circuitry comprises: a circuit for generating a signal synchronous with the pilot signal contained in the composite signal; a synchronous detector circuit for receiving, as the inputs, the composite signal and the synchronous signal, and for thereby generating a DC voltage having an value proportional to the level of the pilot signal contained in the composite signal; and a pulse-forming circuit for receiving, as the inputs, the DC voltage and the synchronous signal, and for thereby forming a pulse, i.e. the extracted pilot signal, which is synchronous with the synchronous signal and which has an amplitude proportional to the value of the DC voltage. Thus is obtained a stable pilot signal having a correct frequency and phase without distortion or fluctuation and having a magnitude well proportional to the received pilot signal level, which pilot signal is very suitable for demodulation.
REFERENCES:
patent: 3611161 (1971-10-01), Claxton
patent: 3660607 (1972-05-01), Mack
patent: 3902014 (1975-08-01), Lindell et al.
patent: 3959726 (1976-05-01), Hinoshita et al.
Miller, Jr. Stanley D.
Nippon Gakki Seizo Kabushiki Kaisha
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