JPS57198511A - Detecting method for dropout - Google Patents

Detecting method for dropout

Info

Publication number
JPS57198511A
JPS57198511A JP56081015A JP8101581A JPS57198511A JP S57198511 A JPS57198511 A JP S57198511A JP 56081015 A JP56081015 A JP 56081015A JP 8101581 A JP8101581 A JP 8101581A JP S57198511 A JPS57198511 A JP S57198511A
Authority
JP
Japan
Prior art keywords
signal
dropout
frequency
video signal
output
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
JP56081015A
Other languages
Japanese (ja)
Inventor
Toru Fujishima
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 JP56081015A priority Critical patent/JPS57198511A/en
Publication of JPS57198511A publication Critical patent/JPS57198511A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing
    • G11B20/025—Error detection or correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To accurately perform the detection of dropout period, by providing a specific means which detects and uses an FM signal having a frequency two times that of an FM video signal being a part of an FM demodulator output. CONSTITUTION:An FM video signal from an input terminal 1 passes through a band filter 2 and a delay type FM demodulator 3 and obtains an FM signal output having a frequency two times the frequency of a base band video signal and an input FM viceo signal. The video signal is separated at a low pass filter 4 and applied to an output terminal 5, and the FM signal is separated at a high- pass filter 14, amplified at an amplifier 15, applied to a discriminating circuit 62a for the presence/absence of a prescribed frequency signal, where dropout is detected and outputted at a terminal 7. Thus, the conventional limiter circuit matching is not required, the time constant of a retrigger multivibrator 11 can be shortened, and a short dropout can surely be detected.
JP56081015A 1981-05-29 1981-05-29 Detecting method for dropout Pending JPS57198511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56081015A JPS57198511A (en) 1981-05-29 1981-05-29 Detecting method for dropout

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56081015A JPS57198511A (en) 1981-05-29 1981-05-29 Detecting method for dropout

Publications (1)

Publication Number Publication Date
JPS57198511A true JPS57198511A (en) 1982-12-06

Family

ID=13734667

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56081015A Pending JPS57198511A (en) 1981-05-29 1981-05-29 Detecting method for dropout

Country Status (1)

Country Link
JP (1) JPS57198511A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01171184U (en) * 1988-05-09 1989-12-04
US5126853A (en) * 1988-10-26 1992-06-30 Teac Corporation Dropout detecting apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01171184U (en) * 1988-05-09 1989-12-04
US5126853A (en) * 1988-10-26 1992-06-30 Teac Corporation Dropout detecting apparatus

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