JPS61970A - Abnormal signal detector - Google Patents

Abnormal signal detector

Info

Publication number
JPS61970A
JPS61970A JP59120972A JP12097284A JPS61970A JP S61970 A JPS61970 A JP S61970A JP 59120972 A JP59120972 A JP 59120972A JP 12097284 A JP12097284 A JP 12097284A JP S61970 A JPS61970 A JP S61970A
Authority
JP
Japan
Prior art keywords
signal
delay line
carrier
output
range
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
JP59120972A
Other languages
Japanese (ja)
Other versions
JPH0468704B2 (en
Inventor
Akiyoshi Maeda
Fusao Ushio
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59120972A priority Critical patent/JPH0468704B2/ja
Publication of JPS61970A publication Critical patent/JPS61970A/en
Publication of JPH0468704B2 publication Critical patent/JPH0468704B2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G11B20/06—Angle-modulation recording or reproducing

Abstract

PURPOSE:To make IC output pins for external parts as an abnormal signal detector unnecessary by using the phase difference between the input signal and the output signal of a delay line of an FM demodulator of delay line type to detect the abnormal state of an FM carrier reproduced signal. CONSTITUTION:An abnormal signal detecting circuit 27 consists of a latch circuits 23 and 24, an NAND circuit 25, and a level converting circuit 26. The FM carrier signal has always a frequency within a certain shift frequency range; and with respect to input/output phase characteristics of a delay line 6 used in an FM demodulator 9, the phase of the output signal of the delay line 6 is 180 deg.-360 deg. behind that of the input signal in the certain shift frequency range of the FM carrier signal. If the carrier frequency of the FM carrier reproduced signal is deviated from the certain shift range to become higher or lower and the phase difference between the input signal and the output signal of the delay line 6 is deviated from the range of 180 deg.-360 deg., latch circuits 23 and 24 outputs signals (h) and (j), and an abnormality detection pulse l is generated.
JP59120972A 1984-06-13 1984-06-13 Expired - Lifetime JPH0468704B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59120972A JPH0468704B2 (en) 1984-06-13 1984-06-13

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59120972A JPH0468704B2 (en) 1984-06-13 1984-06-13

Publications (2)

Publication Number Publication Date
JPS61970A true JPS61970A (en) 1986-01-06
JPH0468704B2 JPH0468704B2 (en) 1992-11-04

Family

ID=14799585

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59120972A Expired - Lifetime JPH0468704B2 (en) 1984-06-13 1984-06-13

Country Status (1)

Country Link
JP (1) JPH0468704B2 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5428107A (en) * 1977-08-04 1979-03-02 Sanyo Electric Co Ltd Drop-out detecting system
JPS5555450A (en) * 1978-10-02 1980-04-23 Rca Corp Defect sensor
JPS5752642A (en) * 1980-09-16 1982-03-29 Honda Motor Co Ltd Electronic fuel injection device for internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5428107A (en) * 1977-08-04 1979-03-02 Sanyo Electric Co Ltd Drop-out detecting system
JPS5555450A (en) * 1978-10-02 1980-04-23 Rca Corp Defect sensor
JPS5752642A (en) * 1980-09-16 1982-03-29 Honda Motor Co Ltd Electronic fuel injection device for internal combustion engine

Also Published As

Publication number Publication date
JPH0468704B2 (en) 1992-11-04

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