发明名称 |
Automatic gain control device for use in an optical memory device. |
摘要 |
<p>An automatic gain control device for use in an optical memory device has a circuit for producing an amplification control signal which is fed back 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 fed back 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.</p> |
申请公布号 |
EP0325491(A1) |
申请公布日期 |
1989.07.26 |
申请号 |
EP19890300580 |
申请日期 |
1989.01.20 |
申请人 |
SHARP KABUSHIKI KAISHA |
发明人 |
FUJI, HIROSHI;MAEDA, SHIGEMI;YAMAGUCHI, TAKESHI NO. 202 GREEN HAITSU WAKAKUSA 4;KOJIMA, KUNIO;DEGUCHI, TOSHIHISA NO. C-722 DAIYA-HAITSU;TERASHIMA, SHIGEO |
分类号 |
G11B7/00;G11B7/005;G11B11/105;G11B19/02;G11B20/10 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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