JPS56127906A - Dropout compensating circuit of vtr for pcm magnetic recording and reproduction - Google Patents

Dropout compensating circuit of vtr for pcm magnetic recording and reproduction

Info

Publication number
JPS56127906A
JPS56127906A JP2811980A JP2811980A JPS56127906A JP S56127906 A JPS56127906 A JP S56127906A JP 2811980 A JP2811980 A JP 2811980A JP 2811980 A JP2811980 A JP 2811980A JP S56127906 A JPS56127906 A JP S56127906A
Authority
JP
Japan
Prior art keywords
dropout
signal
horizontal period
noise
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
JP2811980A
Other languages
Japanese (ja)
Inventor
Takaharu Noguchi
Takao Arai
Takashi Hoshino
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 JP2811980A priority Critical patent/JPS56127906A/en
Publication of JPS56127906A publication Critical patent/JPS56127906A/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
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1806—Pulse code modulation systems for audio signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Error Detection And Correction (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To avoid a wrong correction in case when a dropout arises for a horizontal period or longer, by adding the noise simultaneously with an addition of the 1- horizontal period preceding frequency modulated signal and the detected signal. CONSTITUTION:When the dropout is detected for the FM signal of an automatic gain control AGC amplifier 8 by a dropout detector 9, both the 1-horizontal period preceding FM signal that passed through the 1H-delaying circuit 12 and the signal produced by adding the noise from the noise generator 23 through the 1st adder 22 are sent to the 2nd adder 10 via the dropout switch 11 that works on the output of the output of the detector 9 to be added to the output of the amplifier 8. Thus the signal containing the noise is always supplied to the dropout part. In such constitution, a wrong correction can be avoided in case when a dropout continues for the 1- horizontal period or longer and synchronously with the horizontal period.
JP2811980A 1980-03-07 1980-03-07 Dropout compensating circuit of vtr for pcm magnetic recording and reproduction Pending JPS56127906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2811980A JPS56127906A (en) 1980-03-07 1980-03-07 Dropout compensating circuit of vtr for pcm magnetic recording and reproduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2811980A JPS56127906A (en) 1980-03-07 1980-03-07 Dropout compensating circuit of vtr for pcm magnetic recording and reproduction

Publications (1)

Publication Number Publication Date
JPS56127906A true JPS56127906A (en) 1981-10-07

Family

ID=12239908

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2811980A Pending JPS56127906A (en) 1980-03-07 1980-03-07 Dropout compensating circuit of vtr for pcm magnetic recording and reproduction

Country Status (1)

Country Link
JP (1) JPS56127906A (en)

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