JPS5491305A - Servo device for video tape recorder - Google Patents
Servo device for video tape recorderInfo
- Publication number
- JPS5491305A JPS5491305A JP15961777A JP15961777A JPS5491305A JP S5491305 A JPS5491305 A JP S5491305A JP 15961777 A JP15961777 A JP 15961777A JP 15961777 A JP15961777 A JP 15961777A JP S5491305 A JPS5491305 A JP S5491305A
- Authority
- JP
- Japan
- Prior art keywords
- counted
- value
- video tape
- tape recorder
- servo device
- 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
Landscapes
- Control Of Velocity Or Acceleration (AREA)
Abstract
PURPOSE: to make a capstan servo digital by controlling the rotating speed of a video head such that the counted value of count pulses becomes equal to a first reference value.
CONSTITUTION: The rise and break of square waves are counted between rotational phase pulses a and b. The counted value n1 takes a relation of 262 = n0 in a reference mode. As a result, if n1<262, the video head is so controlled as to reduce the rotating speed. Then, the rise or break of the square waves, as shown at 3, is counted between the rotational phase pulses b and vertical synchronizing signals, and the counted value n2 is compared with a reference value nR. If n2>nR, the rotations are retarded. On the other hand, if n2<nR the rotations are advanced.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15961777A JPS5491305A (en) | 1977-12-28 | 1977-12-28 | Servo device for video tape recorder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15961777A JPS5491305A (en) | 1977-12-28 | 1977-12-28 | Servo device for video tape recorder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5491305A true JPS5491305A (en) | 1979-07-19 |
JPS5644499B2 JPS5644499B2 (en) | 1981-10-20 |
Family
ID=15697620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15961777A Granted JPS5491305A (en) | 1977-12-28 | 1977-12-28 | Servo device for video tape recorder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5491305A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5862696U (en) * | 1981-10-23 | 1983-04-27 | マックス株式会社 | Static electricity removal mechanism of endless drafting sheet device |
-
1977
- 1977-12-28 JP JP15961777A patent/JPS5491305A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5644499B2 (en) | 1981-10-20 |
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