JPS6425356A - Agc gain control circuit for optical recording and reproducing device - Google Patents
Agc gain control circuit for optical recording and reproducing deviceInfo
- 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
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.
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)
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 |
-
1987
- 1987-07-21 JP JP17997487A patent/JPH0752559B2/en not_active Expired - Lifetime
Cited By (4)
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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