JPS5564655A - Inter-music signal detector - Google Patents

Inter-music signal detector

Info

Publication number
JPS5564655A
JPS5564655A JP13704178A JP13704178A JPS5564655A JP S5564655 A JPS5564655 A JP S5564655A JP 13704178 A JP13704178 A JP 13704178A JP 13704178 A JP13704178 A JP 13704178A JP S5564655 A JPS5564655 A JP S5564655A
Authority
JP
Japan
Prior art keywords
output
waveform
soundless
regions
amplifier
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
JP13704178A
Other languages
Japanese (ja)
Inventor
Taketaka Ookawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP13704178A priority Critical patent/JPS5564655A/en
Publication of JPS5564655A publication Critical patent/JPS5564655A/en
Pending legal-status Critical Current

Links

Landscapes

  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

PURPOSE: To make it possible to obtain a high-precision intermusic signal even if records differ in material or reflectivity, by providing an optical monitor unit which monitors soundless regions on a record disk at any time, in addition to an optical signal detector.
CONSTITUTION: Light from light emitting body 23 is caused to strike soundless regions on the reverse surface of record disk 3 through the reverse surface of turntable 20 or its through hole 22 and its reflected light is picked up by photo detector 24, so that the output waveform of photo detector 24 will be shown by 30. This output waveform 30 is amplified by amplifier 25, whose output is partially rectified through low-pass filter 26, and the output is inverted 27 and inputted to differential amplifier 28 together with the output of amplifier 25 to obtain output waveform 31, which is peak-rectified 29, so that level waveform 32 can be obtained which depends only upon the reflection from the reverse side of the turntable and reflected light from soundless regions of the record without surface vibration components. Instead of a comparison voltage by a conventional external variable level setter, waveform 32 obtained by peak-rectifying the output of differential amplifier 28 is used to obtain a high-precision inter-music signal.
COPYRIGHT: (C)1980,JPO&Japio
JP13704178A 1978-11-06 1978-11-06 Inter-music signal detector Pending JPS5564655A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13704178A JPS5564655A (en) 1978-11-06 1978-11-06 Inter-music signal detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13704178A JPS5564655A (en) 1978-11-06 1978-11-06 Inter-music signal detector

Publications (1)

Publication Number Publication Date
JPS5564655A true JPS5564655A (en) 1980-05-15

Family

ID=15189471

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13704178A Pending JPS5564655A (en) 1978-11-06 1978-11-06 Inter-music signal detector

Country Status (1)

Country Link
JP (1) JPS5564655A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622660A (en) * 1983-02-17 1986-11-11 Cowans Kenneth W Systems and methods for signal compensation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622660A (en) * 1983-02-17 1986-11-11 Cowans Kenneth W Systems and methods for signal compensation

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