G - Physics – 11 – B
Patent
G - Physics
11
B
352/32, 330/39
G11B 7/00 (2006.01) G11B 7/005 (2006.01) G11B 11/105 (2006.01) G11B 19/02 (2006.01) G11B 20/10 (2006.01)
Patent
CA 1306517
ABSTRACT OF THE DISCLOSURES An automatic gain control device for use in an optical memory device has a circuit for producing an amplification control signal which is fedback to a gain control amplifier through a sample-hold circuit. A pulse train detection circuit is provided for detecting the pulse train indicating that the data stored area on the optical memory device is being playbacked. When the pulse train is detected, the sample-hold circuit is made inactive so that the amplification control signal is directly fedback to the gain control amplifier, and when the pulse train ends, the sample-hold circuit is made active to hold the amplification control signal obtained at the end of the pulse train and to produce the amplification control signal held in the sample-hold circuit.
588714
Deguchi Toshihisa
Fuji Hiroshi
Kojima Kunio
Maeda Shigemi
Terashima Shigeo
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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