JPS6479973A - Digital signal reproducing device - Google Patents

Digital signal reproducing device

Info

Publication number
JPS6479973A
JPS6479973A JP23675787A JP23675787A JPS6479973A JP S6479973 A JPS6479973 A JP S6479973A JP 23675787 A JP23675787 A JP 23675787A JP 23675787 A JP23675787 A JP 23675787A JP S6479973 A JPS6479973 A JP S6479973A
Authority
JP
Japan
Prior art keywords
signal
reproducing
comparator
circuit
differentiating
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
Application number
JP23675787A
Other languages
Japanese (ja)
Inventor
Hiroshi Fuji
Takeshi Yamaguchi
Kunio Kojima
Toshihisa Deguchi
Shigeo Terajima
Tsuneo Fujiwara
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP23675787A priority Critical patent/JPS6479973A/en
Priority to CA000577830A priority patent/CA1322594C/en
Priority to US07/245,771 priority patent/US4954903A/en
Priority to DE8888308755T priority patent/DE3873678T2/en
Priority to EP88308755A priority patent/EP0312214B1/en
Publication of JPS6479973A publication Critical patent/JPS6479973A/en
Priority to US07/498,710 priority patent/US5166838A/en
Pending legal-status Critical Current

Links

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  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To eliminate amplitude fluctuation and influence of a low frequency component and then to carry out a reproducing by comparing a 2nd order differentiating signal of a reproducing signal with a prescribed value, generating then a binary window signal and gating a peak detecting signal of the reproduc ing signal with this window signal. CONSTITUTION:The reproducing signal 2 read by an optical head from a magneto-optical disk is inputted to a data detecting circuit 3. The signal 2 is sent to a differentiating circuit 4 to be outputted. A 1st order differentiating signal 3' is sent to a comparator 5 and a differentiating circuit 6. The signal 3' is compared with a zero level by the comparator 5 to supply a differentiating binary signal to a trailing edge detecting circuit 7. The 2nd order differentiating signal 4' is sent by the circuit 6 to a comparator 9, where it is compared with a voltage V0 which is slightly negative from 0V by the comparator 9. An output of the comparator 9 is inverted by an inverter 10 to form the window signal 6'. The peak detecting signal 7' is gated by an AND circuit 8 based on the signal 6' to output a reproducing data signal 8'. By this method, the amplitude fluctuation and the influence of the low frequency component comprised in the reproducing signal is eliminated and reproducing can be carried out.
JP23675787A 1987-09-21 1987-09-21 Digital signal reproducing device Pending JPS6479973A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP23675787A JPS6479973A (en) 1987-09-21 1987-09-21 Digital signal reproducing device
CA000577830A CA1322594C (en) 1987-09-21 1988-09-19 Digital signal reproduction apparatus
US07/245,771 US4954903A (en) 1987-09-21 1988-09-19 Digital signal reproduction apparatus for reading magneto-optical disks
DE8888308755T DE3873678T2 (en) 1987-09-21 1988-09-21 DATA SIGNAL PLAYER.
EP88308755A EP0312214B1 (en) 1987-09-21 1988-09-21 Digital signal reproduction apparatus
US07/498,710 US5166838A (en) 1987-09-21 1990-03-26 Digital signal reproduction apparatus for reading magneto-optical discs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23675787A JPS6479973A (en) 1987-09-21 1987-09-21 Digital signal reproducing device

Publications (1)

Publication Number Publication Date
JPS6479973A true JPS6479973A (en) 1989-03-24

Family

ID=17005340

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23675787A Pending JPS6479973A (en) 1987-09-21 1987-09-21 Digital signal reproducing device

Country Status (1)

Country Link
JP (1) JPS6479973A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0466670A2 (en) * 1990-07-13 1992-01-15 International Business Machines Corporation System and method for optical phase change recording
US5311493A (en) * 1990-04-06 1994-05-10 Sharp Kabushiki Kaisha Data reproduction circuit for converting a read analog signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311493A (en) * 1990-04-06 1994-05-10 Sharp Kabushiki Kaisha Data reproduction circuit for converting a read analog signal
EP0466670A2 (en) * 1990-07-13 1992-01-15 International Business Machines Corporation System and method for optical phase change recording

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