JPS5564638A - Optical reproducing device - Google Patents
Optical reproducing deviceInfo
- Publication number
- JPS5564638A JPS5564638A JP13861178A JP13861178A JPS5564638A JP S5564638 A JPS5564638 A JP S5564638A JP 13861178 A JP13861178 A JP 13861178A JP 13861178 A JP13861178 A JP 13861178A JP S5564638 A JPS5564638 A JP S5564638A
- Authority
- JP
- Japan
- Prior art keywords
- pulse signal
- signal
- differentiator
- demodulator
- comparator
- 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 improve reproducing performance by providing a pulse position detecting method.
CONSTITUTION: A pulse position detecting method consisting of high-pass filter 12, delay circuit 13, comparator 14, Schmitt trigger circuit 15, NAND gate circuit 16, and differentiator 17 is arranged between photoelectric detector 11 and demodulator 18. An unneeded low-frequency component of the output pulse signal of photoelectric detector 11 receiving light reflected by a track on record disk 19 is removed to obtain pulse signal A, which is compared by comparator 14 with pulse signal B delayed by delay circuit 13 and after NAND by NAND gate circuit 16 and differentiation by differentiator 17, a positive-directional pulse signal is extracted to regenerate an information signal by demodulator 18. Therefore, a signal with excellent SN can be regenerated from a frequency-modulated or phasemodulated detection pulse signal of wide width, thereby achieving the purpose.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13861178A JPS5564638A (en) | 1978-11-09 | 1978-11-09 | Optical reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13861178A JPS5564638A (en) | 1978-11-09 | 1978-11-09 | Optical reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5564638A true JPS5564638A (en) | 1980-05-15 |
Family
ID=15226121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13861178A Pending JPS5564638A (en) | 1978-11-09 | 1978-11-09 | Optical reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5564638A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100658354B1 (en) * | 2005-08-25 | 2006-12-15 | 엘지전자 주식회사 | Apparatus for automatic frequency estimation |
-
1978
- 1978-11-09 JP JP13861178A patent/JPS5564638A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100658354B1 (en) * | 2005-08-25 | 2006-12-15 | 엘지전자 주식회사 | Apparatus for automatic frequency estimation |
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