Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-04-14
1985-10-29
Psitos, Aristotelis M.
Facsimile and static presentation processing
Facsimile
Recording apparatus
369 13, H04M 9491, G11B 1100
Patent
active
045503460
ABSTRACT:
A magneto-optic information recording system for recording colorplexed composite video information on a magneto-optic information storage medium having a normal magnetization film, comprising means for emitting a recording laser beam to irradiate the normal magnetization film in the presence of a bias magnetic field; a field induction coil to induce the bias magnetic field; a low-pass filter for extracting a luminance signal component from the composite video information; a modulator to modulate the laser beam in accordance with the signal component extracted by the low-pass filter; a band-pass filter for extracting a carrier chrominance signal component from the composite video information; a frequency converter for converting the carrier chrominance signal component into a signal with a predetermined frequency lower than the frequency of the color subcarrier; and field control means responsive to the frequency-converted chrominance signal component and operative to vary the bias magnetic field in accordance with the frequency-converted chrominance signal component while the normal magnetization film is being irradiated with the modulated recording beam of light.
REFERENCES:
"Application of Magneto-Optic Read-Out to a Video Signal", Tokumaru et al., NHK Lab. Notes, Feb. 1983, S.N. 285.
"Experimental Study on Magneto-Optical Disk Exerciser with the Laser Diode and Amorphous Magnetic Thin Films," by Imamura et al., Japanese Journal of Applied Physics, vol. 19, No. 12, pp. L731-L734, Dec. 1980.
Pioneer Electronic Corporation
Psitos Aristotelis M.
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