JPS56104588A - Drum servo circuit - Google Patents

Drum servo circuit

Info

Publication number
JPS56104588A
JPS56104588A JP658380A JP658380A JPS56104588A JP S56104588 A JPS56104588 A JP S56104588A JP 658380 A JP658380 A JP 658380A JP 658380 A JP658380 A JP 658380A JP S56104588 A JPS56104588 A JP S56104588A
Authority
JP
Japan
Prior art keywords
circuit
output
synchronizing signal
horizontal synchronizing
gate
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
JP658380A
Other languages
Japanese (ja)
Other versions
JPS6349955B2 (en
Inventor
Kenji Nakano
Tadahiko Nakamura
Masaaki Sakai
Mitsutoshi Magai
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP658380A priority Critical patent/JPS56104588A/en
Publication of JPS56104588A publication Critical patent/JPS56104588A/en
Publication of JPS6349955B2 publication Critical patent/JPS6349955B2/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 prevent disturbance of the drum servo system, by providing the first and the second detecting circuits which detect drop-out of the reproducing horizontal synchronizing signal and noise in the video signal and by holding the drum rotation frequency voltage, by which the frequency of the horizontal synchronizing signal is caused to approach a prescribed value, when outputs of these detecting circuit are obtained. CONSTITUTION:Horizontal synchronizing signal PBH is supplied to reproducing period detecting circuit 6, horizontal synchronizing signal drop-out detecting circuit 18, and noise mask circuit 22 through gate circuits 15 and 16. Pulse width modulation signal PWM is formed according to the reproducing synchronizing signal by circuit 6, and servo voltage C is output by LPF7. The output detected by circuit 18 is applied to circuit 16 and gate 19 to generate artificial modulation signal PWM at the output of circuit 1. Output Q of circuit 22 is applied to counter 23 and is counted, and the output is applied to gate 20. When horizontal synchronizing signal drop-out and noise are detected by circuits 18 and 22, modulation signal output from circuit 6 is held in FF21 and is output from output circuit 17, thereby preventing disturbance of the servo system.
JP658380A 1980-01-23 1980-01-23 Drum servo circuit Granted JPS56104588A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP658380A JPS56104588A (en) 1980-01-23 1980-01-23 Drum servo circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP658380A JPS56104588A (en) 1980-01-23 1980-01-23 Drum servo circuit

Publications (2)

Publication Number Publication Date
JPS56104588A true JPS56104588A (en) 1981-08-20
JPS6349955B2 JPS6349955B2 (en) 1988-10-06

Family

ID=11642342

Family Applications (1)

Application Number Title Priority Date Filing Date
JP658380A Granted JPS56104588A (en) 1980-01-23 1980-01-23 Drum servo circuit

Country Status (1)

Country Link
JP (1) JPS56104588A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0310864A (en) * 1989-06-08 1991-01-18 Canon Inc Recording apparatus

Also Published As

Publication number Publication date
JPS6349955B2 (en) 1988-10-06

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