Audio frequency heterodyne means and method

Details Audio frequency heterodyne means and method Audio frequency heterodyne means and method

1976-05-26

1978-10-10

Safourek, Benedict V.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325419, 179 15BP, 358148, H03B 308

Patent

active

041199120

ABSTRACT:
Means and method for producing, at a plurality locally spaced of transmitting stations, an audio frequency pilot signal to be fed by the stations into a common communication or power transmission network, the pilot signals fed by the stations being synchronous and in phase with one another. The pilot signals are synchronized by a subharmonic frequency signal generated at a central station by frequency division and fed to each of the transmitting stations. At each transmitting station, a phase-locked-loop circuit is employed to set and maintain the pilot signals in phase with the subharmonic frequency signal.

REFERENCES:
patent: 2033237 (1936-03-01), Gannett
patent: 2531199 (1950-11-01), Darling
patent: 3593138 (1971-07-01), Dunn et al.
patent: 3746991 (1973-07-01), Gautney
patent: 3927373 (1975-12-01), Janssens
patent: 3995111 (1976-10-01), Tsuji et al.

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