JPS5468603A - Reducing system of variations of time axis of disc player - Google Patents

Reducing system of variations of time axis of disc player

Info

Publication number
JPS5468603A
JPS5468603A JP13640377A JP13640377A JPS5468603A JP S5468603 A JPS5468603 A JP S5468603A JP 13640377 A JP13640377 A JP 13640377A JP 13640377 A JP13640377 A JP 13640377A JP S5468603 A JPS5468603 A JP S5468603A
Authority
JP
Japan
Prior art keywords
time axis
disc
eccentricity
variations
variation
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
JP13640377A
Other languages
Japanese (ja)
Other versions
JPS622375B2 (en
Inventor
Hiroyoshi Hashimoto
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP13640377A priority Critical patent/JPS5468603A/en
Publication of JPS5468603A publication Critical patent/JPS5468603A/en
Publication of JPS622375B2 publication Critical patent/JPS622375B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/28—Speed controlling, regulating, or indicating

Landscapes

  • Rotational Drive Of Disk (AREA)

Abstract

PURPOSE:To achieve the reduction in the variation components of time axis owing to eccentricity by performing normal fixing when the time axis variations in the reproduction signal having been extracted by soft landing a disc on a rotary table reach a specified level. CONSTITUTION:The video signal drawn out from a disc 3 under rotation and demodulated with a demodulator 11 is applied to a synchronous separator circuit 12 to obtain a horizontal synchronizing signal. Since this signal receives time axis variations in the similar manner as when the tracking speed of a pickup varies, it is detected with a jitter detector 13 and the variation frequency owing to eccentricity becomes (n) Hz when the disc rotates (n) turns and therefore only the frequency components thereof are drawn out with a BPF 14 and are rectified, after which the specified level is detected in a Schmitt circuit 16, thereby driving a solenoid 6 by way of an R-SFF 18 and switch 7. As a result, the disc which has been initially mildly pressed onto the rotary table is normally fixed, thus no longer causing any slip. Thereby, the time axis variation components (jitter) based on the eccentricity may be reduced.
JP13640377A 1977-11-11 1977-11-11 Reducing system of variations of time axis of disc player Granted JPS5468603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13640377A JPS5468603A (en) 1977-11-11 1977-11-11 Reducing system of variations of time axis of disc player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13640377A JPS5468603A (en) 1977-11-11 1977-11-11 Reducing system of variations of time axis of disc player

Publications (2)

Publication Number Publication Date
JPS5468603A true JPS5468603A (en) 1979-06-01
JPS622375B2 JPS622375B2 (en) 1987-01-19

Family

ID=15174341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13640377A Granted JPS5468603A (en) 1977-11-11 1977-11-11 Reducing system of variations of time axis of disc player

Country Status (1)

Country Link
JP (1) JPS5468603A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130273A (en) * 1981-02-03 1982-08-12 Nakamichi Corp Automatic positioning method for record
WO1986005310A1 (en) * 1985-03-09 1986-09-12 Deutsche Thomson-Brandt Gmbh System to ascertain the scanning speed of audio discs with contactless scanning
JPS62132266A (en) * 1985-12-02 1987-06-15 Nippon Kogaku Kk <Nikon> Magnetic recording signal reproducing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01248960A (en) * 1988-03-26 1989-10-04 Toyota Motor Corp High voltage generator for automobile

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57130273A (en) * 1981-02-03 1982-08-12 Nakamichi Corp Automatic positioning method for record
WO1986005310A1 (en) * 1985-03-09 1986-09-12 Deutsche Thomson-Brandt Gmbh System to ascertain the scanning speed of audio discs with contactless scanning
JPS62501999A (en) * 1985-03-09 1987-08-06 ドイチエ　トムソン−ブラント　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング Scanning speed detection device for non-contact scanning audio disc
JPS62132266A (en) * 1985-12-02 1987-06-15 Nippon Kogaku Kk <Nikon> Magnetic recording signal reproducing device

Also Published As

Publication number Publication date
JPS622375B2 (en) 1987-01-19

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