JPS6446264A - Noise reducing device - Google Patents

Noise reducing device

Info

Publication number
JPS6446264A
JPS6446264A JP20286987A JP20286987A JPS6446264A JP S6446264 A JPS6446264 A JP S6446264A JP 20286987 A JP20286987 A JP 20286987A JP 20286987 A JP20286987 A JP 20286987A JP S6446264 A JPS6446264 A JP S6446264A
Authority
JP
Japan
Prior art keywords
waveform
noise
noise waveform
reproducing
signal
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
JP20286987A
Other languages
Japanese (ja)
Inventor
Shigeki Komatsu
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.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric 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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP20286987A priority Critical patent/JPS6446264A/en
Publication of JPS6446264A publication Critical patent/JPS6446264A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

PURPOSE:To effectively reduce noise by registering an expected noise waveform to a memory, obtaining the correlation between the waveform and a reproducing signal, subtracting the noise waveform when the correlation exists, and supplying the waveform and the signal to the signal reproducing system at rear stage as they are. CONSTITUTION:The noise waveform, which has a risk to be superimposed on the reproducing signal due to a flaw occurring in a recording medium, is registered beforehand to a noise waveform memory 12 composed of a ROM, etc., as a digital signal form. The correlation between a reproducing waveform and the noise waveform is calculated by reading the noise waveform and the reproducing signal respectively from the noise waveform memory 12 and a work RAM 13, repeating a processing to add the product of the both while gradually staggering the reading timing of one of them. When it is decided that the correlation exists, the reproducing signal and the noise waveform are read out again from the work RAM 13 and the noise waveform memory 12, the difference between both are prepared, and the difference is written into an output buffer 17. Thus, the noise can be effectively reduced.
JP20286987A 1987-08-14 1987-08-14 Noise reducing device Pending JPS6446264A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20286987A JPS6446264A (en) 1987-08-14 1987-08-14 Noise reducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20286987A JPS6446264A (en) 1987-08-14 1987-08-14 Noise reducing device

Publications (1)

Publication Number Publication Date
JPS6446264A true JPS6446264A (en) 1989-02-20

Family

ID=16464542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20286987A Pending JPS6446264A (en) 1987-08-14 1987-08-14 Noise reducing device

Country Status (1)

Country Link
JP (1) JPS6446264A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0352804U (en) * 1989-09-25 1991-05-22
JP2010266831A (en) * 2009-05-12 2010-11-25 Futaba Yamada Pocket magnifying glass

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0352804U (en) * 1989-09-25 1991-05-22
JP2010266831A (en) * 2009-05-12 2010-11-25 Futaba Yamada Pocket magnifying glass

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