Title:
【発明の名称】自動利得制御装置
Document Type and Number:
Japanese Patent JP2541975
Kind Code:
B2
Abstract:
PURPOSE:To improve high speed response and also stability by adopting a feedback type automatic gain controller not including any delay element in its feedback loop while adopting the feedback control. CONSTITUTION:An integration capacitor 16 is discharged by a switch 17 just before the start of a field period f1. In opening a switch 12 at the start, the input signal is inputted to a gain control transfer element GCA 5 via a switch 2 and inputted to an operational amplifier 15 and the integration output voltage rises. When the period f1 is finished, the switch 2 is changed over and switches 12, 24 are closed. Thus, the integration output voltage is inputted to a differential amplifier 23 via the GCA 5 and an error output is stored in a hold capacitor 25 and inputted to a control terminal of the GCA 5 via an operational amplifier 26.
Inventors:
YOSHIDA HIDEAKI
Application Number:
JP9913887A
Publication Date:
October 09, 1996
Filing Date:
April 22, 1987
Export Citation:
Assignee:
OLYMPUS OPTICAL CO
International Classes:
H04N5/243; G05B13/00; G05B13/02; H03G3/20; H04N5/14; H04N5/52; (IPC1-7): H04N5/14; H03G3/20; H04N5/243
Domestic Patent References:
| JP63250979A | ||||
| JP62250775A | ||||
| JP61192169A |
Attorney, Agent or Firm:
Susumu Ito