JPS54140410A - Active filter circuit contaning noise canceller - Google Patents

Active filter circuit contaning noise canceller

Info

Publication number
JPS54140410A
JPS54140410A JP4777878A JP4777878A JPS54140410A JP S54140410 A JPS54140410 A JP S54140410A JP 4777878 A JP4777878 A JP 4777878A JP 4777878 A JP4777878 A JP 4777878A JP S54140410 A JPS54140410 A JP S54140410A
Authority
JP
Japan
Prior art keywords
noise
circuit
output
active filter
node
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
JP4777878A
Other languages
Japanese (ja)
Inventor
Seiichi Ueda
Yasuhiro Nunokawa
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 JP4777878A priority Critical patent/JPS54140410A/en
Publication of JPS54140410A publication Critical patent/JPS54140410A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference

Abstract

PURPOSE:To cancel the noise completely by applying the output of the noise canceller to the connection between the feedback element and the CR circuit. CONSTITUTION:The output of the CR circuit comprising resistance R1 and R2 connected in series plus capacitor C1 is applied to amplifier circuit Amp, and the output is fed back to connection N2 of R1 and R1. Thus, an active filter is constituted. On the other hand, the reference voltage of reference voltage generation circuit 1 is compared with the input signal to be given to input part 2 through comparator 3 in order to detect the noise exceeding the reference voltage. Thus, the noise cancel signal is generated form gate circuit 4 to be applied to node N2. The noise pulse applied to input terminal N1 causes a time delay at node N2 via the active filter and causes another delay at output terminal N3. Accordingly, the noise part which was not erased at the rise and fall time of the noise pulse can be reduced so much as to be ignored by applying the cancel signal to node N2 where the intermediate signal delay is caused.
JP4777878A 1978-04-24 1978-04-24 Active filter circuit contaning noise canceller Pending JPS54140410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4777878A JPS54140410A (en) 1978-04-24 1978-04-24 Active filter circuit contaning noise canceller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4777878A JPS54140410A (en) 1978-04-24 1978-04-24 Active filter circuit contaning noise canceller

Publications (1)

Publication Number Publication Date
JPS54140410A true JPS54140410A (en) 1979-10-31

Family

ID=12784821

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4777878A Pending JPS54140410A (en) 1978-04-24 1978-04-24 Active filter circuit contaning noise canceller

Country Status (1)

Country Link
JP (1) JPS54140410A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5686806A (en) * 1979-12-17 1981-07-15 Honda Motor Co Ltd Car body suspension

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5686806A (en) * 1979-12-17 1981-07-15 Honda Motor Co Ltd Car body suspension

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