JPS6446268A - Radial modulation inspecting device - Google Patents
Radial modulation inspecting deviceInfo
- Publication number
- JPS6446268A JPS6446268A JP20273187A JP20273187A JPS6446268A JP S6446268 A JPS6446268 A JP S6446268A JP 20273187 A JP20273187 A JP 20273187A JP 20273187 A JP20273187 A JP 20273187A JP S6446268 A JPS6446268 A JP S6446268A
- Authority
- JP
- Japan
- Prior art keywords
- track
- sector
- average output
- output value
- value
- 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
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
PURPOSE:To detect a partial modulation in a track by comparing the size of the absolute value of the difference in the sector average output value of the same sector as an adjoining track and a value obtained by applying a test level to a track average output value inspected immediately before the track of an inspection object. CONSTITUTION:A sector average output measuring part 5 executes two-point sampling L quantization per sector for an envelope signal (b), adds the obtained value, divides the number of the times of sampling by two, obtains a sector average output value (e) and outputs it to a sector average output storing part 6 and a deciding part 7. The deciding part 7, each time the sector average output value (e) of respective sectors of an M track is inputted, decides that an output value SWM, the SVM-1 of the sector average output value of the same sector as an M-1 track-stored in the sector average output storing part 6, the TVM-1 of the track average output value of an M-1 track stored in a track average output storing part 4 and a sector to satisfy the expression TVM-1Xx¦SVM-1-SVM¦ from a text level (x) are normal and outputs the result. Thus, the modulation at any part in the track can be detected.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20273187A JPS6446268A (en) | 1987-08-14 | 1987-08-14 | Radial modulation inspecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20273187A JPS6446268A (en) | 1987-08-14 | 1987-08-14 | Radial modulation inspecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6446268A true JPS6446268A (en) | 1989-02-20 |
Family
ID=16462228
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20273187A Pending JPS6446268A (en) | 1987-08-14 | 1987-08-14 | Radial modulation inspecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6446268A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03296931A (en) * | 1990-04-17 | 1991-12-27 | Canon Inc | Device for inspecting information recording medium |
JPH0439864U (en) * | 1990-07-30 | 1992-04-03 |
-
1987
- 1987-08-14 JP JP20273187A patent/JPS6446268A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03296931A (en) * | 1990-04-17 | 1991-12-27 | Canon Inc | Device for inspecting information recording medium |
JPH0439864U (en) * | 1990-07-30 | 1992-04-03 |
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