JPS5444503A - Noise detector in optical recorder-reproducer - Google Patents

Noise detector in optical recorder-reproducer

Info

Publication number
JPS5444503A
JPS5444503A JP11071477A JP11071477A JPS5444503A JP S5444503 A JPS5444503 A JP S5444503A JP 11071477 A JP11071477 A JP 11071477A JP 11071477 A JP11071477 A JP 11071477A JP S5444503 A JPS5444503 A JP S5444503A
Authority
JP
Japan
Prior art keywords
noise
spike
signal
pulse width
form noise
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
JP11071477A
Other languages
Japanese (ja)
Inventor
Hideo Okamura
Shiro Tsuji
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 JP11071477A priority Critical patent/JPS5444503A/en
Publication of JPS5444503A publication Critical patent/JPS5444503A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To reduce the effect of spike-form noise without impairing the quality of demodulated audio signal by detecting the presence of spike-form noise through variation in the envelope of demodulated pilot signal and creating a gate signal corresponding to the noise section.
CONSTITUTION: The integrated circuit 21 of constitution part 1 detects the envelope of the pilot signal P from a stereo decorder 16 and generates the disturbance in the envelope signal corresponding to pulse-form noise, the crest value whereof is then compared with a reference voltage in a comparator 22 and is sent out as the noise detection signal by pulses. A pulse width changing circuit 23, consisting of a monostable circuit, etc., makes the pulse width of the noise detection signal approximately equal to the pulse width of the spike-form noise. A filter circuit 24 consisting of BPF or LPF detects the spike-form noise out of the demodulated audio signal. A comparator 27 determines the pulse width of the noise section signal from the magnitude of the waveforms of integrators 25, 26 for the spike-form noise. Thereby, the effect of the spike-form noise may be reduced without impairing the quality of the demodulated audio signal.
COPYRIGHT: (C)1979,JPO&Japio
JP11071477A 1977-09-14 1977-09-14 Noise detector in optical recorder-reproducer Pending JPS5444503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11071477A JPS5444503A (en) 1977-09-14 1977-09-14 Noise detector in optical recorder-reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11071477A JPS5444503A (en) 1977-09-14 1977-09-14 Noise detector in optical recorder-reproducer

Publications (1)

Publication Number Publication Date
JPS5444503A true JPS5444503A (en) 1979-04-09

Family

ID=14542602

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11071477A Pending JPS5444503A (en) 1977-09-14 1977-09-14 Noise detector in optical recorder-reproducer

Country Status (1)

Country Link
JP (1) JPS5444503A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312872U (en) * 1986-07-11 1988-01-27

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6312872U (en) * 1986-07-11 1988-01-27

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