JPS57170672A - Drop-out testing device - Google Patents
Drop-out testing deviceInfo
- Publication number
- JPS57170672A JPS57170672A JP5608681A JP5608681A JPS57170672A JP S57170672 A JPS57170672 A JP S57170672A JP 5608681 A JP5608681 A JP 5608681A JP 5608681 A JP5608681 A JP 5608681A JP S57170672 A JPS57170672 A JP S57170672A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- drop
- time width
- desk
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/06—Diagnosis, testing or measuring for television systems or their details for recorders
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
PURPOSE:To perform the quality control of a video disk by detecting a drop-out signal from a regenerative signal and counting up the signal in every constant angle and constant track of a desk. CONSTITUTION:A video envelope signal T is extracted from a regenerative signal through an envelope detecting circuit 11. A signal T and an attenuation signal, the average of the signal T, are inputted to a comparator 15, which detects a part less than the signal level of an attenuating circuit 13 and generates a pulse relating to time width. A width discriminating circuit 16 defines and detects the falling level of the signal T and generates a pulse for the time width larger than the prescribed time width. A gate circuit controlling signal synchronized by a desk rotational angle detecting circuit 21 is formed from a signal outputted from a standard angle detecting circuit 22 and the vertical synchronizing signal. A gate circuit 17 makes a drop-out signal pass only at the high level of the control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5608681A JPS57170672A (en) | 1981-04-13 | 1981-04-13 | Drop-out testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5608681A JPS57170672A (en) | 1981-04-13 | 1981-04-13 | Drop-out testing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57170672A true JPS57170672A (en) | 1982-10-20 |
| JPS6253118B2 JPS6253118B2 (en) | 1987-11-09 |
Family
ID=13017274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5608681A Granted JPS57170672A (en) | 1981-04-13 | 1981-04-13 | Drop-out testing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57170672A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6143884A (en) * | 1984-08-08 | 1986-03-03 | Victor Co Of Japan Ltd | Dropout detection circuit |
| US6712467B1 (en) | 1999-04-13 | 2004-03-30 | Hoya Corporation | Progressive-power lens and design process for same |
-
1981
- 1981-04-13 JP JP5608681A patent/JPS57170672A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6143884A (en) * | 1984-08-08 | 1986-03-03 | Victor Co Of Japan Ltd | Dropout detection circuit |
| US6712467B1 (en) | 1999-04-13 | 2004-03-30 | Hoya Corporation | Progressive-power lens and design process for same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6253118B2 (en) | 1987-11-09 |
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