JPS6452266A - Information signal extraction circuit - Google Patents
Information signal extraction circuitInfo
- 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
Links
Landscapes
- 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.
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) |
-
1987
- 1987-09-09 JP JP22608287A patent/JPS6452266A/en active Pending
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