JPS5580845A - Head servo circuit - Google Patents

Head servo circuit

Info

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
Application number
JP15385578A
Other languages
Japanese (ja)
Inventor
Fumio Majima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP15385578A priority Critical patent/JPS5580845A/en
Publication of JPS5580845A publication Critical patent/JPS5580845A/en
Pending legal-status Critical Current

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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
JP15385578A 1978-12-07 1978-12-07 Head servo circuit Pending JPS5580845A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59219082A (en) * 1983-05-27 1984-12-10 Hitachi Ltd Magnetic video recording and reproducing device

Cited By (1)

* Cited by examiner, † Cited by third party
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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