JPS6425356A - Agc gain control circuit for optical recording and reproducing device - Google Patents

Agc gain control circuit for optical recording and reproducing device

Info

Publication number
JPS6425356A
JPS6425356A JP17997487A JP17997487A JPS6425356A JP S6425356 A JPS6425356 A JP S6425356A JP 17997487 A JP17997487 A JP 17997487A JP 17997487 A JP17997487 A JP 17997487A JP S6425356 A JPS6425356 A JP S6425356A
Authority
JP
Japan
Prior art keywords
data
agc
signal
show
data part
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.)
Granted
Application number
JP17997487A
Other languages
Japanese (ja)
Other versions
JPH0752559B2 (en
Inventor
Hiroshi Suzuki
Takuya Mizogami
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP17997487A priority Critical patent/JPH0752559B2/en
Publication of JPS6425356A publication Critical patent/JPS6425356A/en
Publication of JPH0752559B2 publication Critical patent/JPH0752559B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To effectively prevent the reproduction defective of reading data by setting respectively independently an AGC amplifier with a gain concerning an ID part and a data part. CONSTITUTION:The circuit is equipped with a first means 8 to detect a sector mark 201 to show the starting point of the data of a sector unit read optically and to output a signal to show the output timing of an ID part 202 and a data part 203 succeeding to the sector mark 201, a second means 9 to set an AGC again suitable to the ID part 202 while the first means 8 outputs a signal to show the output timing of the ID part 202 and a third means 13 to set the AGC again suitable for the data part 203 while the first means 8 outputs the signal to show the output timing of the data part. Based on a timing signal prepared as a basis of the sector mark by the first means 8, the AGC again of the ID part and the data part is separately set by the second means 9 and the third means 13 and added to an AGC amplifier 3. As such a result, a suitable AGC again setting is executed concerning respective ID part 202 and data part 203 and a reproducing signal (reading data) without an output fluctuation can be obtained.
JP17997487A 1987-07-21 1987-07-21 AGC gain control circuit of optical recording / reproducing apparatus Expired - Lifetime JPH0752559B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17997487A JPH0752559B2 (en) 1987-07-21 1987-07-21 AGC gain control circuit of optical recording / reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17997487A JPH0752559B2 (en) 1987-07-21 1987-07-21 AGC gain control circuit of optical recording / reproducing apparatus

Publications (2)

Publication Number Publication Date
JPS6425356A true JPS6425356A (en) 1989-01-27
JPH0752559B2 JPH0752559B2 (en) 1995-06-05

Family

ID=16075237

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17997487A Expired - Lifetime JPH0752559B2 (en) 1987-07-21 1987-07-21 AGC gain control circuit of optical recording / reproducing apparatus

Country Status (1)

Country Link
JP (1) JPH0752559B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406852A2 (en) * 1989-07-06 1991-01-09 Hitachi, Ltd. Automatic gain control method and appartus in optical disk system
US5463603A (en) * 1992-03-18 1995-10-31 Imp, Inc. Computer disk drive integrated data path circuit optimized for handling both data and servo signals
US5606544A (en) * 1994-05-23 1997-02-25 Olympus Optical Co., Ltd. Optical information recording and regenerating apparatus which regulates the amplitude of a regenerated signal
US6172699B1 (en) 1992-12-08 2001-01-09 Ricoh Company, Ltd. Thermal printing system having function for preventing over heating of thermal head

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406852A2 (en) * 1989-07-06 1991-01-09 Hitachi, Ltd. Automatic gain control method and appartus in optical disk system
US5463603A (en) * 1992-03-18 1995-10-31 Imp, Inc. Computer disk drive integrated data path circuit optimized for handling both data and servo signals
US6172699B1 (en) 1992-12-08 2001-01-09 Ricoh Company, Ltd. Thermal printing system having function for preventing over heating of thermal head
US5606544A (en) * 1994-05-23 1997-02-25 Olympus Optical Co., Ltd. Optical information recording and regenerating apparatus which regulates the amplitude of a regenerated signal

Also Published As

Publication number Publication date
JPH0752559B2 (en) 1995-06-05

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