JPS6476575A - Tracking circuit - Google Patents
Tracking circuitInfo
- Publication number
- JPS6476575A JPS6476575A JP23443887A JP23443887A JPS6476575A JP S6476575 A JPS6476575 A JP S6476575A JP 23443887 A JP23443887 A JP 23443887A JP 23443887 A JP23443887 A JP 23443887A JP S6476575 A JPS6476575 A JP S6476575A
- Authority
- JP
- Japan
- Prior art keywords
- value
- window
- sampling value
- selector
- range
- 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.)
- Granted
Links
Abstract
PURPOSE:To limit a sudden change in a tracking error signal and to trace a track with large eccentricity by comparing the present sampling value with a window of prescribed width centering a preceding sampling value and a prescribed reference value. CONSTITUTION:A window generation circuit 2 generates a window by adding/ subtracting a value of prescribed width on the preceding sampling value, and a first comparator 4 compares the present sampling value with the window, and controls a selector 3 corresponding to a compared result. And the selector 3 selects the present sampling value when it is set within the range of the window, and selects the window value when it is set outside the range. The output of the selector 3 is compared with the prescribed reference value by a second comparator 7, and the present sampling value is latched by a latch circuit 6 when it is set within the range of the reference value, and the preceding sampling value is outputted when it is set outside the reference value. In such a way, it is possible to limit the sudden change of the tracking error signal and simultaneously, to perform the tracking of the disk with the large eccentricity.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62234438A JPH06101209B2 (en) | 1987-09-18 | 1987-09-18 | Tracking circuit |
US07/167,284 US4860271A (en) | 1987-03-13 | 1988-03-11 | Servo circuit for generating a tracking error signal for optical disk player |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62234438A JPH06101209B2 (en) | 1987-09-18 | 1987-09-18 | Tracking circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6476575A true JPS6476575A (en) | 1989-03-22 |
JPH06101209B2 JPH06101209B2 (en) | 1994-12-12 |
Family
ID=16971010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62234438A Expired - Fee Related JPH06101209B2 (en) | 1987-03-13 | 1987-09-18 | Tracking circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06101209B2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57143765A (en) * | 1981-03-02 | 1982-09-06 | Sony Corp | Disc reproducing device |
JPS57152574A (en) * | 1981-03-18 | 1982-09-20 | Hitachi Ltd | Tracking controlling circuit |
JPS59152545A (en) * | 1983-02-21 | 1984-08-31 | Toshiba Corp | Optical disk record reproducer |
JPS63155426A (en) * | 1986-12-19 | 1988-06-28 | Hitachi Ltd | Controlling system for position of light spot |
-
1987
- 1987-09-18 JP JP62234438A patent/JPH06101209B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57143765A (en) * | 1981-03-02 | 1982-09-06 | Sony Corp | Disc reproducing device |
JPS57152574A (en) * | 1981-03-18 | 1982-09-20 | Hitachi Ltd | Tracking controlling circuit |
JPS59152545A (en) * | 1983-02-21 | 1984-08-31 | Toshiba Corp | Optical disk record reproducer |
JPS63155426A (en) * | 1986-12-19 | 1988-06-28 | Hitachi Ltd | Controlling system for position of light spot |
Also Published As
Publication number | Publication date |
---|---|
JPH06101209B2 (en) | 1994-12-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |