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JPS551787A - Detector for pulsive noise - Google Patents

Detector for pulsive noise

Info

Publication number
JPS551787A
JPS551787A JP7576978A JP7576978A JPS551787A JP S551787 A JPS551787 A JP S551787A JP 7576978 A JP7576978 A JP 7576978A JP 7576978 A JP7576978 A JP 7576978A JP S551787 A JPS551787 A JP S551787A
Authority
JP
Japan
Prior art keywords
circuit
control
collector
pulsive noise
transistor
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
JP7576978A
Other languages
Japanese (ja)
Other versions
JPS6143891B2 (en
Inventor
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 JP7576978A priority Critical patent/JPS551787A/en
Priority to US06/022,342 priority patent/US4278901A/en
Priority to DE2922011A priority patent/DE2922011C2/en
Publication of JPS551787A publication Critical patent/JPS551787A/en
Publication of JPS6143891B2 publication Critical patent/JPS6143891B2/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

  • Manipulation Of Pulses (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To prevent the destruction of transistor at excessive input, by providing the current limit circuit limiting the collector current with the control transistor of the circuit controlling the gain, in the pulsive noise detector. CONSTITUTION:The unit consists of the input terminal 1 fed with the high frequency input including pulsive noise, differential amplifier 2 amplifying the signal, full wave rectifying circuit 3 rectifying the output signal of the circuit 2, pulsive noise detection circuit 4 detecting the pulsive noise included in the output signal, smoothing circuit 5 generating the DC signal corresponding to the continuous noise level included in the output signal of the circuit 3, control circuit 6 to control the gain of the circuit 2, and first and second control transistors 8 and 9 connected to the circuits 5 and 6. In this case, the current limit resistor 26 is newly connected in series with the collector of the transistor 8. Thus, when the collector current is increased, voltage drop of the resistor 26 is increased to prevent the destruction by lowering the collector voltage.
JP7576978A 1978-06-09 1978-06-19 Detector for pulsive noise Granted JPS551787A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP7576978A JPS551787A (en) 1978-06-19 1978-06-19 Detector for pulsive noise
US06/022,342 US4278901A (en) 1978-06-09 1979-03-20 Pulsive component detecting apparatus
DE2922011A DE2922011C2 (en) 1978-06-09 1979-05-30 Device for detecting impulsive interference signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7576978A JPS551787A (en) 1978-06-19 1978-06-19 Detector for pulsive noise

Publications (2)

Publication Number Publication Date
JPS551787A true JPS551787A (en) 1980-01-08
JPS6143891B2 JPS6143891B2 (en) 1986-09-30

Family

ID=13585738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7576978A Granted JPS551787A (en) 1978-06-09 1978-06-19 Detector for pulsive noise

Country Status (1)

Country Link
JP (1) JPS551787A (en)

Also Published As

Publication number Publication date
JPS6143891B2 (en) 1986-09-30

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