JPS5580845A - Head servo circuit - Google Patents
Head servo circuitInfo
- Publication number
- JPS5580845A JPS5580845A JP15385578A JP15385578A JPS5580845A JP S5580845 A JPS5580845 A JP S5580845A JP 15385578 A JP15385578 A JP 15385578A JP 15385578 A JP15385578 A JP 15385578A JP S5580845 A JPS5580845 A JP S5580845A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- reproduction
- double
- horizontal
- reproduction time
- 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
- Control Of Velocity Or Acceleration (AREA)
Abstract
PURPOSE: To obtain the steady picture by giving the control to the rotation of the head motor so that the horizontal synchronous cycle may be identical between the double-speed reproduction time and the normal reproduction time for the VTR.
CONSTITUTION: The alternating record scanning is carried out via rotary magnetic heads HA and HB featuring the different azimuths. And the high-speed reproduction is given to the magnetic tape which formed the recording track with the shift given to the opposite side of the scanning by 0.75H and with the high-speed running in the velocity of an odd-fold of the normal reproduction speed. At this double-speed reproduction time,the switch is changed over to the double-speed reproduction side T. Thus division output (a) which gave the frame division to the reproduction horizontal signal relating the rotations of heads HA and HB is supplied in the form of the comparison signal of comparator circuit 15. And reference signal (c) formed based on reference signal (b) of the frame division is sample-held, and the rotation of head motor 17 is maintained based on the holding output to secure the fixed reproduction horizontal cycle.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15385578A JPS5580845A (en) | 1978-12-07 | 1978-12-07 | Head servo circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15385578A JPS5580845A (en) | 1978-12-07 | 1978-12-07 | Head servo circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5580845A true JPS5580845A (en) | 1980-06-18 |
Family
ID=15571569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15385578A Pending JPS5580845A (en) | 1978-12-07 | 1978-12-07 | Head servo circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5580845A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59219082A (en) * | 1983-05-27 | 1984-12-10 | Hitachi Ltd | Magnetic video recording and reproducing device |
-
1978
- 1978-12-07 JP JP15385578A patent/JPS5580845A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59219082A (en) * | 1983-05-27 | 1984-12-10 | Hitachi Ltd | Magnetic video recording and reproducing device |
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