JPS5593535A - Optical information reproducing device - Google Patents
Optical information reproducing deviceInfo
- Publication number
- JPS5593535A JPS5593535A JP16507278A JP16507278A JPS5593535A JP S5593535 A JPS5593535 A JP S5593535A JP 16507278 A JP16507278 A JP 16507278A JP 16507278 A JP16507278 A JP 16507278A JP S5593535 A JPS5593535 A JP S5593535A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- electric signal
- equalizer
- carrier level
- compensating
- 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 keep the frequency characteristic of the reproducing RF signal fixed independently of information recording positions by comparing DC components of an electric signal obtained from the recording face with a FM carrier level and by compensating the electric signal above by a control signal corresponding to thier difference.
CONSTITUTION: An electric signal (FM-modulated RF signal) obtained from a video disc by photoelectric conveter 1 is sent to FM demodulator 4 through RF amplifier 2 and equalizer 3 and is demodulated to take out recording information. In this case, only DC components of the electric signal above are detected by DC amplifier 6, and the FM carrier level of the signal which passed through equalizer 3 is detected by carrier level detector 5, and voltages VD and VC corresponding to respective values are inputted to comparator 7. Next, equalizer 3 is controlled by control signal Vf corresponding to difference between voltages VD and VC from comparator 7, thereby compensating the frequency characteristic of the electric signal.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16507278A JPS5593535A (en) | 1978-12-29 | 1978-12-29 | Optical information reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16507278A JPS5593535A (en) | 1978-12-29 | 1978-12-29 | Optical information reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5593535A true JPS5593535A (en) | 1980-07-16 |
JPS6123570B2 JPS6123570B2 (en) | 1986-06-06 |
Family
ID=15805329
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16507278A Granted JPS5593535A (en) | 1978-12-29 | 1978-12-29 | Optical information reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5593535A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07169052A (en) * | 1986-10-06 | 1995-07-04 | Philips Electron Nv | Apparatus for recording of information in recording carrier |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0454879Y2 (en) * | 1989-07-14 | 1992-12-22 |
-
1978
- 1978-12-29 JP JP16507278A patent/JPS5593535A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07169052A (en) * | 1986-10-06 | 1995-07-04 | Philips Electron Nv | Apparatus for recording of information in recording carrier |
Also Published As
Publication number | Publication date |
---|---|
JPS6123570B2 (en) | 1986-06-06 |
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