Dynamic magnetic information storage or retrieval – Modulating or demodulating – Frequency
Patent
1976-03-19
1977-10-04
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Modulating or demodulating
Frequency
358 8, G11B 502
Patent
active
040527409
ABSTRACT:
A method and apparatus for suppressing spurious interference components that arise in video recording apparatus of the type which utilize frequency modulation of the carrier signal with a video signal is disclosed. The invention suppresses an unwanted spurious interference signal component substantially to zero by generating the second harmonic of a fundamental signal in the video information modulating signal and adding the second harmonic to the fundamental modulating signal at a predetermined phase and amplitude prior to being modulated upon the carrier signal. The phase is such that the resulting signal is that which, when the second harmonic is added, heightens the upward deviating peaks and flattens the lower peaks of the fundamental modulating signal. The amplitude of the added second harmonic is such as to minimize the interference component and is varied signal in direct proportion to the square of any variation in the modulating index of the fundamental modulating signal.
REFERENCES:
patent: 3084224 (1963-04-01), Sanford
patent: 3893168 (1975-07-01), Bechly et al.
Ampex Corporation
Canney Vincent P.
Clay Robert G.
Mossino Ralph L.
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