JPS567577A - Magnetic recording and reproducing unit - Google Patents

Magnetic recording and reproducing unit

Info

Publication number
JPS567577A
JPS567577A JP8369279A JP8369279A JPS567577A JP S567577 A JPS567577 A JP S567577A JP 8369279 A JP8369279 A JP 8369279A JP 8369279 A JP8369279 A JP 8369279A JP S567577 A JPS567577 A JP S567577A
Authority
JP
Japan
Prior art keywords
noise
changed
phase
double speed
signal
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
JP8369279A
Other languages
Japanese (ja)
Other versions
JPS6210471B2 (en
Inventor
Yoshio Koga
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8369279A priority Critical patent/JPS567577A/en
Publication of JPS567577A publication Critical patent/JPS567577A/en
Publication of JPS6210471B2 publication Critical patent/JPS6210471B2/ja
Granted 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 enable the double speed reproduction without noise, by controlling the tape drive when noise is appeared on the screen at the double speed reproduction of picture and expelling the noise to nondisplay part such as the vertical blanking period. CONSTITUTION:In the noise at double speed reproduction, the relation between the track and the head is at an arbitrary phase. The noise (c) picked up at the noise detector 3 and the signal (d) being the vertical blanking period output from the reference phase signal generator 4 are not in agreement and the comparator 5 outputs the disagreement signal (e). Accordingly, the gate circuit 7 gives pulsive output to the step voltage generator 8. Thus, the delay time of the delay circuit 10 is changed, the rotary phase of motor is changed via the APC unit 11, the relation of position between the track and the head is also changed, and the phase of noise in the reproducing video signal (a) is also changed. This series of operation is repeated several times and noise is expelled to the part not displayed on the reproduced screen.
JP8369279A 1979-06-29 1979-06-29 Magnetic recording and reproducing unit Granted JPS567577A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8369279A JPS567577A (en) 1979-06-29 1979-06-29 Magnetic recording and reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8369279A JPS567577A (en) 1979-06-29 1979-06-29 Magnetic recording and reproducing unit

Publications (2)

Publication Number Publication Date
JPS567577A true JPS567577A (en) 1981-01-26
JPS6210471B2 JPS6210471B2 (en) 1987-03-06

Family

ID=13809537

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8369279A Granted JPS567577A (en) 1979-06-29 1979-06-29 Magnetic recording and reproducing unit

Country Status (1)

Country Link
JP (1) JPS567577A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173282A (en) * 1981-04-17 1982-10-25 Hitachi Ltd Auto tracking device for variable speed reproduction
JPS5847234A (en) * 1981-09-16 1983-03-18 Japanese National Railways<Jnr> Vehicle riding comfort segment meter
JPS60103546A (en) * 1983-11-11 1985-06-07 Hitachi Ltd Variable speed reproduction tracking device of magnetic recording and reproducing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62158720U (en) * 1986-03-28 1987-10-08

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173282A (en) * 1981-04-17 1982-10-25 Hitachi Ltd Auto tracking device for variable speed reproduction
JPS5847234A (en) * 1981-09-16 1983-03-18 Japanese National Railways<Jnr> Vehicle riding comfort segment meter
JPS6318130B2 (en) * 1981-09-16 1988-04-16 Tetsudo Sogo Gijutsu Kenkyusho
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

Also Published As

Publication number Publication date
JPS6210471B2 (en) 1987-03-06

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