JPS553235A - Pulse noise detection circuit - Google Patents

Pulse noise detection circuit

Info

Publication number
JPS553235A
JPS553235A JP7561378A JP7561378A JPS553235A JP S553235 A JPS553235 A JP S553235A JP 7561378 A JP7561378 A JP 7561378A JP 7561378 A JP7561378 A JP 7561378A JP S553235 A JPS553235 A JP S553235A
Authority
JP
Japan
Prior art keywords
transistor
noise
pulse noise
vbe
output
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
JP7561378A
Other languages
Japanese (ja)
Other versions
JPS6143889B2 (en
Inventor
Junji Sakamoto
Hiroyasu Kishi
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.)
Tokyo Sanyo Electric Co Ltd
Sanyo Electric Co Ltd
Original Assignee
Tokyo Sanyo Electric Co Ltd
Sanyo 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 Tokyo Sanyo Electric Co Ltd, Sanyo Electric Co Ltd filed Critical Tokyo Sanyo Electric Co Ltd
Priority to JP7561378A priority Critical patent/JPS553235A/en
Priority to US06/023,408 priority patent/US4289981A/en
Priority to DE2912689A priority patent/DE2912689C2/en
Publication of JPS553235A publication Critical patent/JPS553235A/en
Publication of JPS6143889B2 publication Critical patent/JPS6143889B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking

Landscapes

  • Noise Elimination (AREA)
  • Manipulation Of Pulses (AREA)
  • Networks Using Active Elements (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To secure an effective detection only for the pulse noise with no malfunction by increasing the ratio of the detection levels between the continuous noise and the pulse noise. CONSTITUTION:The input signals of the high freqnency component of the continuous noise such as the pulse noise, the white noise and the like are applied to differential amplifier circuit 3. And rectifying transistor 31 and 32 conduct when the output of transistor 7 is larger than that of transistor 8, and transistor 33 and 34 conduct in the opposite case respectively. The peak detection is given to the output of full-wave rectifier circuit 23 via transistor 25, and this output is converted to the gain control signal through capacitor 12 to be fixed at VBE by the conduction of control transistor 17. Continuous noise voltage VBW applied to point B of the base of transistor 25 is identical to VBE. At the same time, voltage VEP caused by application of the pulse noise at point B features the relation of VBP=R1/R2.VBE (R1. R2: value of resistance 26 and 27), thus increasing the detection level ratio. And the saturation is prevented for transistor 5 and 6 via clip circuit 28.
JP7561378A 1978-06-21 1978-06-21 Pulse noise detection circuit Granted JPS553235A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP7561378A JPS553235A (en) 1978-06-21 1978-06-21 Pulse noise detection circuit
US06/023,408 US4289981A (en) 1978-06-21 1979-03-23 Pulsive component detecting apparatus
DE2912689A DE2912689C2 (en) 1978-06-21 1979-03-30 Device for detecting impulsive interference signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7561378A JPS553235A (en) 1978-06-21 1978-06-21 Pulse noise detection circuit

Publications (2)

Publication Number Publication Date
JPS553235A true JPS553235A (en) 1980-01-11
JPS6143889B2 JPS6143889B2 (en) 1986-09-30

Family

ID=13581228

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7561378A Granted JPS553235A (en) 1978-06-21 1978-06-21 Pulse noise detection circuit

Country Status (1)

Country Link
JP (1) JPS553235A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61107223U (en) * 1984-12-17 1986-07-08
JPS63125192A (en) * 1986-11-08 1988-05-28 ナツクス株式会社 Crown extractor
JPS6394197U (en) * 1986-12-09 1988-06-17
JPS6394196U (en) * 1986-12-09 1988-06-17
JPH0163696U (en) * 1987-06-25 1989-04-24
CN106569018A (en) * 2016-10-20 2017-04-19 成都前锋电子仪器有限责任公司 Peak value demodulation circuit for radio frequency power meter

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61107223U (en) * 1984-12-17 1986-07-08
JPS63125192A (en) * 1986-11-08 1988-05-28 ナツクス株式会社 Crown extractor
JPH048317B2 (en) * 1986-11-08 1992-02-14 Nax Kk
JPS6394197U (en) * 1986-12-09 1988-06-17
JPS6394196U (en) * 1986-12-09 1988-06-17
JPH0163696U (en) * 1987-06-25 1989-04-24
CN106569018A (en) * 2016-10-20 2017-04-19 成都前锋电子仪器有限责任公司 Peak value demodulation circuit for radio frequency power meter
CN106569018B (en) * 2016-10-20 2023-03-21 成都前锋电子仪器有限责任公司 Peak detection circuit for radio frequency power meter

Also Published As

Publication number Publication date
JPS6143889B2 (en) 1986-09-30

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