JPS56143544A - Error signal detecting system - Google Patents
Error signal detecting systemInfo
- Publication number
- JPS56143544A JPS56143544A JP4543280A JP4543280A JPS56143544A JP S56143544 A JPS56143544 A JP S56143544A JP 4543280 A JP4543280 A JP 4543280A JP 4543280 A JP4543280 A JP 4543280A JP S56143544 A JPS56143544 A JP S56143544A
- Authority
- JP
- Japan
- Prior art keywords
- error signal
- signal
- amplifier
- passed
- detecting system
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Optical Recording Or Reproduction (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To detect an error signal accurately and stably by emphasizing the low- frequency side of a signal reproduced from an optical recording body by suppressing its high-frequency side and then by detecting the error signal. CONSTITUTION:A reproduced signal from photodetector 4 is passed through amplifier 5 and then branched into two; one is inputted direct to error signal compensating circuit 10, and the other is passed through an amplifier and then inputted to low-pass filter 7, whose output is compared with threshold level 9 by comparator 8 to control error signal compensating circuit 10. Thus, an error signal existing a lower frequency band than the frequency of the information signal can securely be compensated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4543280A JPS56143544A (en) | 1980-04-07 | 1980-04-07 | Error signal detecting system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4543280A JPS56143544A (en) | 1980-04-07 | 1980-04-07 | Error signal detecting system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56143544A true JPS56143544A (en) | 1981-11-09 |
Family
ID=12719137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4543280A Pending JPS56143544A (en) | 1980-04-07 | 1980-04-07 | Error signal detecting system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56143544A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2512962A1 (en) * | 1981-09-14 | 1983-03-18 | Sony Corp | CIRCUIT FOR DETECTING THE EXISTENCE OF AN INFORMATION SIGNAL |
JPS60157772A (en) * | 1984-01-27 | 1985-08-19 | Sony Corp | Detection level adjusting method |
JPS62146469A (en) * | 1985-12-20 | 1987-06-30 | Sony Corp | Dropout detecting circuit |
USRE39054E1 (en) | 1997-04-25 | 2006-04-04 | Aisin Seiki Kabushiki Kaisha | Vehicle drive system including drive mode-shifting mechanism for shifting between two-wheel drive and four-wheel drive |
-
1980
- 1980-04-07 JP JP4543280A patent/JPS56143544A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2512962A1 (en) * | 1981-09-14 | 1983-03-18 | Sony Corp | CIRCUIT FOR DETECTING THE EXISTENCE OF AN INFORMATION SIGNAL |
JPS60157772A (en) * | 1984-01-27 | 1985-08-19 | Sony Corp | Detection level adjusting method |
JPS62146469A (en) * | 1985-12-20 | 1987-06-30 | Sony Corp | Dropout detecting circuit |
USRE39054E1 (en) | 1997-04-25 | 2006-04-04 | Aisin Seiki Kabushiki Kaisha | Vehicle drive system including drive mode-shifting mechanism for shifting between two-wheel drive and four-wheel drive |
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