JPS54121611A - Noise eliminating circuit - Google Patents

Noise eliminating circuit

Info

Publication number
JPS54121611A
JPS54121611A JP2869878A JP2869878A JPS54121611A JP S54121611 A JPS54121611 A JP S54121611A JP 2869878 A JP2869878 A JP 2869878A JP 2869878 A JP2869878 A JP 2869878A JP S54121611 A JPS54121611 A JP S54121611A
Authority
JP
Japan
Prior art keywords
signal
circuit
impulse noise
diode
noise
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
JP2869878A
Other languages
Japanese (ja)
Other versions
JPS6036139B2 (en
Inventor
Hideo Nishijima
Isao Fukushima
Hiroyuki 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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2869878A priority Critical patent/JPS6036139B2/en
Publication of JPS54121611A publication Critical patent/JPS54121611A/en
Publication of JPS6036139B2 publication Critical patent/JPS6036139B2/en
Expired 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)

Abstract

PURPOSE:To ensure an effective noise elimination effect by cutting off the AM signal at the input side of the detection circuit for the period during which the impulse noise exists and also switching the time constant of the signal holding circuit. CONSTITUTION:For the noise elimination circuit used to the AM reception circuit, integrating capacitor 10 and load resistance 4 are connected at the output side of detecting diode 13. And electronic switch 18 and 19, which operate on the control signal obtained through waveform shaping of the impulse noise given from terminal 2 while the impulse noise mixing into the AM signal of input terminal 1, are connected to the input side of diode 3 as well as to the earth side of resistance 4. The AM signal which are applied to diode 3 during existence of the impulse noise are cut off by switch 18 and 19. And the time constant of the integrating circuit forming the signal holding circuit is increased to hold the signals at capacitor 10.
JP2869878A 1978-03-15 1978-03-15 Noise removal circuit Expired JPS6036139B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2869878A JPS6036139B2 (en) 1978-03-15 1978-03-15 Noise removal circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2869878A JPS6036139B2 (en) 1978-03-15 1978-03-15 Noise removal circuit

Publications (2)

Publication Number Publication Date
JPS54121611A true JPS54121611A (en) 1979-09-20
JPS6036139B2 JPS6036139B2 (en) 1985-08-19

Family

ID=12255683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2869878A Expired JPS6036139B2 (en) 1978-03-15 1978-03-15 Noise removal circuit

Country Status (1)

Country Link
JP (1) JPS6036139B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57163848U (en) * 1981-04-06 1982-10-15

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57163848U (en) * 1981-04-06 1982-10-15

Also Published As

Publication number Publication date
JPS6036139B2 (en) 1985-08-19

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