JPS5468208A - Automatic gain control system - Google Patents
Automatic gain control systemInfo
- Publication number
- JPS5468208A JPS5468208A JP13552977A JP13552977A JPS5468208A JP S5468208 A JPS5468208 A JP S5468208A JP 13552977 A JP13552977 A JP 13552977A JP 13552977 A JP13552977 A JP 13552977A JP S5468208 A JPS5468208 A JP S5468208A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- noise
- servo
- automatic gain
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
Abstract
PURPOSE: To prevent the increase in disturbance of position error signal despite entry of noise in servo signal owing to external noise by providing a differentiation circuit, a level comparator and a timer holding circuit to an automatic gain control circuit and detecting the abrupt change in the control voltage thereby maintaining the control voltage.
CONSTITUTION: The servo signal having been read from the servo face of a magnetic disc is supplied to an automatic gain amplifier 41. In positive and negative peak detection circuits 44, 45, the positive and negative peak values D, E of the servo signal are detected from the output A of an amplifier 41, whereby the position error signal F is formed. The feedback signal G which added the difference of both peak signals D, E is supervised with a differentiator 52, whereby the output signal J is obtained. This signal J is level-compared with a reference voltage Er in a level comparator 53 to detect noise, whereby the output signal K is obtained. A timer 54 is actuated by this signal K, then the signal L is sent out for the time longer than the time when adverse influence by the noise is given. When the noise enters the control signal H, the signal L causes the signal H to maintain the voltage before the entry of the noise and that signal M is applied as the control signal to the amplifier 41.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13552977A JPS5468208A (en) | 1977-11-10 | 1977-11-10 | Automatic gain control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13552977A JPS5468208A (en) | 1977-11-10 | 1977-11-10 | Automatic gain control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5468208A true JPS5468208A (en) | 1979-06-01 |
Family
ID=15153893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13552977A Pending JPS5468208A (en) | 1977-11-10 | 1977-11-10 | Automatic gain control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5468208A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2536196A1 (en) * | 1982-11-11 | 1984-05-18 | Sony Corp | ALARM SERVO CONTROL CIRCUIT FOR OPTICAL REPRODUCTION DEVICE |
JPS59229773A (en) * | 1983-06-10 | 1984-12-24 | Pioneer Electronic Corp | Record information reader |
JPS63222377A (en) * | 1987-03-11 | 1988-09-16 | Hitachi Ltd | Disk shape information storage device |
-
1977
- 1977-11-10 JP JP13552977A patent/JPS5468208A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2536196A1 (en) * | 1982-11-11 | 1984-05-18 | Sony Corp | ALARM SERVO CONTROL CIRCUIT FOR OPTICAL REPRODUCTION DEVICE |
JPS59229773A (en) * | 1983-06-10 | 1984-12-24 | Pioneer Electronic Corp | Record information reader |
JPH039557B2 (en) * | 1983-06-10 | 1991-02-08 | Pioneer Electronic Corp | |
JPS63222377A (en) * | 1987-03-11 | 1988-09-16 | Hitachi Ltd | Disk shape information storage device |
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