JPS5613880A - Automatic tracking device of variable speed reproduction - Google Patents

Automatic tracking device of variable speed reproduction

Info

Publication number
JPS5613880A
JPS5613880A JP8814879A JP8814879A JPS5613880A JP S5613880 A JPS5613880 A JP S5613880A JP 8814879 A JP8814879 A JP 8814879A JP 8814879 A JP8814879 A JP 8814879A JP S5613880 A JPS5613880 A JP S5613880A
Authority
JP
Japan
Prior art keywords
reproduction
variable speed
delay amount
detected
band
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
JP8814879A
Other languages
Japanese (ja)
Inventor
Nobuo Azuma
Katsuo Mori
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8814879A priority Critical patent/JPS5613880A/en
Publication of JPS5613880A publication Critical patent/JPS5613880A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/783—Adaptations for reproducing at a rate different from the recording rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To obtain the perfect tracking with a comparatively simple constitution, by getting out the noise band caused by the variable speed reproduction to the outside of the screen and then giving the automatic tracking correction. CONSTITUTION:For the VTR which performs the variable speed reproduction in the running speed different from that of the recording time, the unit delay amount is set to variable speed delaying circuit 17 by data signal (f) when microcomputer 19 decides the start of reproduction by reproduction start signal (g) sent from the VTR. Then the vertical blanking period is detected by rise ''H'' of head switch signal (b), and computer 19 decides whether drop-out output (c) is ''H'' or not at that time. If output (c) is ''H'', the noise band is got out of the screen. This means that the noiseless band is detected. Thus the increment of the delay amount is stopped to carry out the decision for the start of reproduction again. On the other hand, the delay amount is increased by the unit quantity in case the delay amount of circuit 17 does not reach the maximum level. And the above-mentioned action is continued until the noiseless band is detected.
JP8814879A 1979-07-13 1979-07-13 Automatic tracking device of variable speed reproduction Pending JPS5613880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8814879A JPS5613880A (en) 1979-07-13 1979-07-13 Automatic tracking device of variable speed reproduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8814879A JPS5613880A (en) 1979-07-13 1979-07-13 Automatic tracking device of variable speed reproduction

Publications (1)

Publication Number Publication Date
JPS5613880A true JPS5613880A (en) 1981-02-10

Family

ID=13934840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8814879A Pending JPS5613880A (en) 1979-07-13 1979-07-13 Automatic tracking device of variable speed reproduction

Country Status (1)

Country Link
JP (1) JPS5613880A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508263A1 (en) * 1981-06-19 1982-12-24 Victor Company Of Japan VIDEO SIGNAL REPRODUCTION ASSEMBLY OF SLOW IMAGE OR IMAGE STOP IMAGES
JPS581843A (en) * 1981-06-26 1983-01-07 Hitachi Ltd Automatic tracking device of vtr
JPS60103546A (en) * 1983-11-11 1985-06-07 Hitachi Ltd Variable speed reproduction tracking device of magnetic recording and reproducing device
JPS63142198A (en) * 1986-12-02 1988-06-14 新日本製鐵株式会社 Fixing method of lock bolt made of steel pipe

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2508263A1 (en) * 1981-06-19 1982-12-24 Victor Company Of Japan VIDEO SIGNAL REPRODUCTION ASSEMBLY OF SLOW IMAGE OR IMAGE STOP IMAGES
JPS57210783A (en) * 1981-06-19 1982-12-24 Victor Co Of Japan Ltd Magnetic reproducing device
JPS581843A (en) * 1981-06-26 1983-01-07 Hitachi Ltd Automatic tracking device of vtr
JPH0472300B2 (en) * 1981-06-26 1992-11-17 Hitachi Ltd
JPS60103546A (en) * 1983-11-11 1985-06-07 Hitachi Ltd Variable speed reproduction tracking device of magnetic recording and reproducing device
JPH0572794B2 (en) * 1983-11-11 1993-10-13 Hitachi Ltd
JPS63142198A (en) * 1986-12-02 1988-06-14 新日本製鐵株式会社 Fixing method of lock bolt made of steel pipe

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