Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1985-01-22
1986-06-24
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 30, 360 25, 358336, 358340, H04N 592, H04N 5782
Patent
active
045970211
ABSTRACT:
A video signal recording and reproducing apparatus in which the luminance signal of a color video signal is frequency-modulated for recording and a reproduction frequency-modulated signal is frequency-demodulated to produce a reproduction video signal. A high frequency component is separated from the reproduction video signal and applied to a slice circuit comprising nonlinear elements including, for example, diodes connected in parallel with reverse polarities, thus eliminating noise at the low frequency signals included in the high frequency component. The apparatus further comprises a device for subtracting the sliced signal and the reproduced video signal one from the other in such a manner that the two signals are in phase with each other substantially at the desired ratio and in a predetermined frequency band. In this way, noise contained in the edge portion of the reproduction video signal, crosstalk and moire patterns caused at the time of azimuth recording without a guardband are decreased, thus improving the signal-to-noise ratio of the edge portion. If this apparatus is combined with a conventional device for reducing noise at the low frequency portion of the video signal, FM interleaving techniques and nonlinear emphasis, a high-density recording with narrow tracks and short wavelength is made possible, thereby producing a stable reproduced image with high S/N ratio having no undesired components.
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Graf, Radio Shack Dictionary of Electronics, 1974, pp. 100, 124 and 540.
Arimura Ichiro
Yamamitsu Chojuro
Cardillo Raymond F.
Matsushita Electric - Industrial Co., Ltd.
Weinhardt Robert A.
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