JPS5556775A - Noise eliminating circuit - Google Patents

Noise eliminating circuit

Info

Publication number
JPS5556775A
JPS5556775A JP12970978A JP12970978A JPS5556775A JP S5556775 A JPS5556775 A JP S5556775A JP 12970978 A JP12970978 A JP 12970978A JP 12970978 A JP12970978 A JP 12970978A JP S5556775 A JPS5556775 A JP S5556775A
Authority
JP
Japan
Prior art keywords
video signal
filter
time constant
pass filter
level
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
JP12970978A
Other languages
Japanese (ja)
Other versions
JPS6222503B2 (en
Inventor
Kazuo Yamagiwa
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP12970978A priority Critical patent/JPS5556775A/en
Publication of JPS5556775A publication Critical patent/JPS5556775A/en
Publication of JPS6222503B2 publication Critical patent/JPS6222503B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Picture Signal Circuits (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE: To decrease the waveform distortion and the residual noise by varying the time constant of the high-pass filter according to the scale of the signal amplitude.
CONSTITUTION: The high-band noise component of the video signal supplied to input terminal 1 is extracted by high-pass filter 2 and then limited under the fixed threshold level at limiter 3. And the noise component is eliminated from the video signal obtained by added to the original video signal in the opposite polarity at adder 4. Filter 2 consists of capacitor C and the primary differentiating circuit comprising variable impedance circuit 9 in which input resistance Rin varies according to the input signal level. When the level change of the video signal is large, the time constant of filter 2 is reduced.
COPYRIGHT: (C)1980,JPO&Japio
JP12970978A 1978-10-20 1978-10-20 Noise eliminating circuit Granted JPS5556775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12970978A JPS5556775A (en) 1978-10-20 1978-10-20 Noise eliminating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12970978A JPS5556775A (en) 1978-10-20 1978-10-20 Noise eliminating circuit

Publications (2)

Publication Number Publication Date
JPS5556775A true JPS5556775A (en) 1980-04-25
JPS6222503B2 JPS6222503B2 (en) 1987-05-18

Family

ID=15016255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12970978A Granted JPS5556775A (en) 1978-10-20 1978-10-20 Noise eliminating circuit

Country Status (1)

Country Link
JP (1) JPS5556775A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6219859U (en) * 1985-07-17 1987-02-05
JPS62227278A (en) * 1986-03-28 1987-10-06 Sony Corp Noise reduction circuit
JP2015149677A (en) * 2014-02-07 2015-08-20 株式会社リコー High-pass filter circuit and bandpass filter circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5338212A (en) * 1976-08-30 1978-04-08 Rca Corp Noise attenuator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5338212A (en) * 1976-08-30 1978-04-08 Rca Corp Noise attenuator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6219859U (en) * 1985-07-17 1987-02-05
JPS62227278A (en) * 1986-03-28 1987-10-06 Sony Corp Noise reduction circuit
JP2015149677A (en) * 2014-02-07 2015-08-20 株式会社リコー High-pass filter circuit and bandpass filter circuit

Also Published As

Publication number Publication date
JPS6222503B2 (en) 1987-05-18

Similar Documents

Publication Publication Date Title
JPS55117712A (en) Noise reduction circuit of video signal recording and reproducing device
JPS56137598A (en) Sample hold circuit
JPS5556775A (en) Noise eliminating circuit
JPS56106433A (en) Noise reducing circuit
JPS5737907A (en) Fm wave detector
JPS57104390A (en) Data extracting circuit
JPS53106109A (en) Vedio signal transmitting circuit
JPS5538709A (en) Noise elimination circuit
JPS54118149A (en) Comparator circuit
JPS5487421A (en) Binary circuit
SU1171987A1 (en) Dynamic filter
JPS5786115A (en) Magnetic recorder
JPS52139408A (en) Noise removing circuit
JPS56110406A (en) Filter device for electric vehicle
JPS5552643A (en) Noise reduction unit
JPS5542413A (en) Linear phase equalizer circuit
JPS5513577A (en) Noise reduction system
JPS56107648A (en) Noise reduction circuit
JPS55127737A (en) Noise elimination circuit
SU1061290A1 (en) Device for filtering television signals
SU1059667A2 (en) Dynamic filter
JPS558658A (en) Signal delay circuit
JPS6482879A (en) Adaptive type emphasis system
JPS55110427A (en) Clamp circuit
JPS5578634A (en) Noise reducing device