JPS56122213A - Noise suppressor - Google Patents

Noise suppressor

Info

Publication number
JPS56122213A
JPS56122213A JP2507580A JP2507580A JPS56122213A JP S56122213 A JPS56122213 A JP S56122213A JP 2507580 A JP2507580 A JP 2507580A JP 2507580 A JP2507580 A JP 2507580A JP S56122213 A JPS56122213 A JP S56122213A
Authority
JP
Japan
Prior art keywords
noise
transistors
varied
circuit
low
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
JP2507580A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP2507580A priority Critical patent/JPS56122213A/en
Publication of JPS56122213A publication Critical patent/JPS56122213A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/002—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general without controlling loop

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Noise Elimination (AREA)
  • Picture Signal Circuits (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To ensure a free variation of the suppressing effect of noise, by adding a bias varying means to a transistor circuit for suppression of noise. CONSTITUTION:The input signal is divided into the low-and high-band components through the low-and high-pass filters 12 and 13. The low band component is applied directly to the mixer 14, and the high-band component is applied to the same mixer 14 via the noise suppressing circuit 15. The circuit 15 consists of the bias control circuit comprising the transistors 18 and 19, resistances 20 and 21 plus the variable resistance 23. The base bias voltage of the transistors 18 and 19 is varied by changing the resistance value of the resistance 23. Thus the cut-off region is varied for the transistors 18 and 19. In such way, the noise suppressed region can be varied.
JP2507580A 1980-02-29 1980-02-29 Noise suppressor Pending JPS56122213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2507580A JPS56122213A (en) 1980-02-29 1980-02-29 Noise suppressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2507580A JPS56122213A (en) 1980-02-29 1980-02-29 Noise suppressor

Publications (1)

Publication Number Publication Date
JPS56122213A true JPS56122213A (en) 1981-09-25

Family

ID=12155800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2507580A Pending JPS56122213A (en) 1980-02-29 1980-02-29 Noise suppressor

Country Status (1)

Country Link
JP (1) JPS56122213A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58184881A (en) * 1982-03-31 1983-10-28 アールシーエー　トムソン　ライセンシング　コーポレイシヨン System for coring variable amount to signal
JPS62234495A (en) * 1986-03-31 1987-10-14 Nec Home Electronics Ltd Magnetic recording and reproducing device
FR2618960A1 (en) * 1987-07-29 1989-02-03 Messerschmitt Boelkow Blohm LINEAR NON-LINEAR ADAPTIVE FREQUENCY FILTER WITH LOW DEPHASING
JPH05347526A (en) * 1992-06-16 1993-12-27 Nec Ic Microcomput Syst Ltd Noise reduction circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58184881A (en) * 1982-03-31 1983-10-28 アールシーエー　トムソン　ライセンシング　コーポレイシヨン System for coring variable amount to signal
JPH046305B2 (en) * 1982-03-31 1992-02-05 Rca Licensing Corp
JPS62234495A (en) * 1986-03-31 1987-10-14 Nec Home Electronics Ltd Magnetic recording and reproducing device
FR2618960A1 (en) * 1987-07-29 1989-02-03 Messerschmitt Boelkow Blohm LINEAR NON-LINEAR ADAPTIVE FREQUENCY FILTER WITH LOW DEPHASING
JPH05347526A (en) * 1992-06-16 1993-12-27 Nec Ic Microcomput Syst Ltd Noise reduction circuit

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