JPS6452266A - Information signal extraction circuit - Google Patents

Information signal extraction circuit

Info

Publication number
JPS6452266A
JPS6452266A JP22608287A JP22608287A JPS6452266A JP S6452266 A JPS6452266 A JP S6452266A JP 22608287 A JP22608287 A JP 22608287A JP 22608287 A JP22608287 A JP 22608287A JP S6452266 A JPS6452266 A JP S6452266A
Authority
JP
Japan
Prior art keywords
level
signal
constant
disk
line velocity
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
JP22608287A
Other languages
Japanese (ja)
Inventor
Yoshihiro Matsushima
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 JP22608287A priority Critical patent/JPS6452266A/en
Publication of JPS6452266A publication Critical patent/JPS6452266A/en
Pending legal-status Critical Current

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  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

PURPOSE:To reproduce accurate information by applying envelope detection to a reproduced output from a recording medium, comparing its detection output with a prescribed level so as to generate a gate signal and using the signal so as to drive a disk thereby making the line velocity constant. CONSTITUTION:The DC level of a reproducing signal from a recording medium differs from a region of a disk on which a laser beam is radiated. Thus, in giving the signal to an envelope detection circuit 2 having a proper time constant, a difference in the DC level is detected. Then a comparator 3 compares the proper DC voltage with the detection voltage to output a shaped gate signal. An analog switch 4 is turned on when the gate signal is at an H level to detect address information 6 thereby controlling the disk motor with constant line velocity. The line velocity of the inner and outer periphery is made constant based on the address information in this way to reproduce the information accurately.
JP22608287A 1987-05-06 1987-09-09 Information signal extraction circuit Pending JPS6452266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22608287A JPS6452266A (en) 1987-05-06 1987-09-09 Information signal extraction circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10996387 1987-05-06
JP22608287A JPS6452266A (en) 1987-05-06 1987-09-09 Information signal extraction circuit

Publications (1)

Publication Number Publication Date
JPS6452266A true JPS6452266A (en) 1989-02-28

Family

ID=26449675

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22608287A Pending JPS6452266A (en) 1987-05-06 1987-09-09 Information signal extraction circuit

Country Status (1)

Country Link
JP (1) JPS6452266A (en)

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