JPS6452228A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPS6452228A JPS6452228A JP20866487A JP20866487A JPS6452228A JP S6452228 A JPS6452228 A JP S6452228A JP 20866487 A JP20866487 A JP 20866487A JP 20866487 A JP20866487 A JP 20866487A JP S6452228 A JPS6452228 A JP S6452228A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- envelope
- envelope signal
- data field
- circuit
- 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
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To discriminate correctly a recorded data field and an unrecorded data field by a simple circuit by comparing a reference voltage obtained through sampling and holding an envelope signal of a sector identifier with an envelope signal of the data field. CONSTITUTION:A DC component of a reproduction signal of an optical disk 1 having a sector structure and in which each sector consists of a sector identifier and the data field is eliminated by a high-pass filter 5 and an envelope signal is extracted by an envelope detection circuit 6. The envelope signal is given to a sample and hold circuit 11 via a DC amplitude adjusting circuit 10. The sample and hold circuit 11 receives the timing signal from a controller 9 to hold an envelope signal of a sector identifier, the holding voltage becomes a reference voltage of a comparator 8 and compared with the envelope signal being an output of the envelope detection circuit 6 and binarized. The binarized signal is used to distinguish whether or not recording is finished for the disk.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20866487A JPS6452228A (en) | 1987-08-21 | 1987-08-21 | Optical disk device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20866487A JPS6452228A (en) | 1987-08-21 | 1987-08-21 | Optical disk device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6452228A true JPS6452228A (en) | 1989-02-28 |
Family
ID=16560004
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20866487A Pending JPS6452228A (en) | 1987-08-21 | 1987-08-21 | Optical disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6452228A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0480761A2 (en) * | 1990-10-12 | 1992-04-15 | Pioneer Electronic Corporation | Track crossing detector for optical disk |
-
1987
- 1987-08-21 JP JP20866487A patent/JPS6452228A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0480761A2 (en) * | 1990-10-12 | 1992-04-15 | Pioneer Electronic Corporation | Track crossing detector for optical disk |
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