Frequency modulating and demodulating method and apparatus

Details Frequency modulating and demodulating method and apparatus Frequency modulating and demodulating method and apparatus

1975-04-24

1976-12-14

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

332 19, G11B 504

Patent

active

039979156

ABSTRACT:
An apparatus and method for the frequency modulation and demodulation of a carrier signal by a modulating frequency signal, whereby essentially the same apparatus is used for both functions. During demodulation, the modulating device is switched into a closed loop having a relatively narrow bandwidth, thereby permitting the carrier generated by the modulator to be locked in phase with the signal to be demodulated. During modulation, the loop is opened up and the modulator is used in a normal fashion.

REFERENCES:
patent: 2583983 (1952-01-01), Arndt
patent: 3414842 (1968-12-01), Broadhead, Jr.
patent: 3423540 (1969-01-01), Wortzman
patent: 3622913 (1971-11-01), Shipley
patent: 3637951 (1972-01-01), Brown, Jr.

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