JPS6476575A - Tracking circuit - Google Patents

Tracking circuit

Info

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
Application number
JP23443887A
Other languages
Japanese (ja)
Other versions
JPH06101209B2 (en
Inventor
Akira Motoyama
Fumihiko Yokogawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP62234438A priority Critical patent/JPH06101209B2/en
Priority to US07/167,284 priority patent/US4860271A/en
Publication of JPS6476575A publication Critical patent/JPS6476575A/en
Publication of JPH06101209B2 publication Critical patent/JPH06101209B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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.
JP62234438A 1987-03-13 1987-09-18 Tracking circuit Expired - Fee Related JPH06101209B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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