JPS5491305A - Servo device for video tape recorder - Google Patents

Servo device for video tape recorder

Info

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
Application number
JP15961777A
Other languages
Japanese (ja)
Other versions
JPS5644499B2 (en
Inventor
Shigeyuki Morita
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon 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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP15961777A priority Critical patent/JPS5491305A/en
Publication of JPS5491305A publication Critical patent/JPS5491305A/en
Publication of JPS5644499B2 publication Critical patent/JPS5644499B2/ja
Granted legal-status Critical Current

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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
JP15961777A 1977-12-28 1977-12-28 Servo device for video tape recorder Granted JPS5491305A (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JPS5644499B2 (en) 1981-10-20

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