JPS56140779A - Detector of signal defect - Google Patents

Detector of signal defect

Info

Publication number
JPS56140779A
JPS56140779A JP4326680A JP4326680A JPS56140779A JP S56140779 A JPS56140779 A JP S56140779A JP 4326680 A JP4326680 A JP 4326680A JP 4326680 A JP4326680 A JP 4326680A JP S56140779 A JPS56140779 A JP S56140779A
Authority
JP
Japan
Prior art keywords
signal
wave
defect
multiplied
circuit
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
JP4326680A
Other languages
Japanese (ja)
Inventor
Michiharu Nishihara
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP4326680A priority Critical patent/JPS56140779A/en
Publication of JPS56140779A publication Critical patent/JPS56140779A/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

Landscapes

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

Abstract

PURPOSE:To increase the accuracy of detection, by detecting the signal defect by making use of the multiplied wave having a multiplying relation with the FM signal in case the defect is detected for the detection record signal picked up from the record disk of a video disk player. CONSTITUTION:The FM signal detected through the pickup is amplified by a preamplifier and then supplied to the input terminal in the form of the signal SA. Furthermore the FM signal is shaped into a rectangular wave through a limiter 3 to obtain the signal SB. One of these two signals is supplied to the full-wave rectifying circuit 5. The other signal is delayed by a certain time through a phase shifter 4 to be changed into the signal SC. The signal SC is then turned into a multiplied wave having a certain time duration, e.g., a double multiplied rectangulr wave through the circuit 5 to obtain the signal SD. This signal receives a discrimination whether it is within the prescribed frequency deviation by the signal defect detecting circuit 10. The signal SD is integrated by a low pass filter 6 to obtain the demodulated output SE that is proportional to the density of pulse.
JP4326680A 1980-04-01 1980-04-01 Detector of signal defect Pending JPS56140779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4326680A JPS56140779A (en) 1980-04-01 1980-04-01 Detector of signal defect

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4326680A JPS56140779A (en) 1980-04-01 1980-04-01 Detector of signal defect

Publications (1)

Publication Number Publication Date
JPS56140779A true JPS56140779A (en) 1981-11-04

Family

ID=12659032

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4326680A Pending JPS56140779A (en) 1980-04-01 1980-04-01 Detector of signal defect

Country Status (1)

Country Link
JP (1) JPS56140779A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60117449A (en) * 1983-11-30 1985-06-24 Hitachi Ltd Amplitude reduction detecting circuit
JPH03246740A (en) * 1990-02-26 1991-11-05 Oki Electric Ind Co Ltd Communication bus managing system in network
JPH042364U (en) * 1990-04-23 1992-01-09
JP2007333343A (en) * 2006-06-16 2007-12-27 Noritz Corp Heat exchanger, hot water device provided with same, and water pipe for heat exchanger

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60117449A (en) * 1983-11-30 1985-06-24 Hitachi Ltd Amplitude reduction detecting circuit
JPH0234108B2 (en) * 1983-11-30 1990-08-01 Hitachi Ltd
JPH03246740A (en) * 1990-02-26 1991-11-05 Oki Electric Ind Co Ltd Communication bus managing system in network
JPH042364U (en) * 1990-04-23 1992-01-09
JP2007333343A (en) * 2006-06-16 2007-12-27 Noritz Corp Heat exchanger, hot water device provided with same, and water pipe for heat exchanger

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