JPS5564638A - Optical reproducing device - Google Patents

Optical reproducing device

Info

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
Application number
JP13861178A
Other languages
Japanese (ja)
Inventor
Shinichi Tanaka
Ikuo Matsuda
Tsuneo Hirose
Kazuji Kobayashi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP13861178A priority Critical patent/JPS5564638A/en
Publication of JPS5564638A publication Critical patent/JPS5564638A/en
Pending legal-status Critical Current

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
JP13861178A 1978-11-09 1978-11-09 Optical reproducing device Pending JPS5564638A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100658354B1 (en) * 2005-08-25 2006-12-15 엘지전자 주식회사 Apparatus for automatic frequency estimation

Cited By (1)

* Cited by examiner, † Cited by third party
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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