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JPS5648714A - Chattering noise eliminating circuit - Google Patents

Chattering noise eliminating circuit

Info

Publication number
JPS5648714A
JPS5648714A JP12419679A JP12419679A JPS5648714A JP S5648714 A JPS5648714 A JP S5648714A JP 12419679 A JP12419679 A JP 12419679A JP 12419679 A JP12419679 A JP 12419679A JP S5648714 A JPS5648714 A JP S5648714A
Authority
JP
Japan
Prior art keywords
logic
output
noise
ffs
signal
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
JP12419679A
Other languages
Japanese (ja)
Inventor
Koji Nakazawa
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 JP12419679A priority Critical patent/JPS5648714A/en
Publication of JPS5648714A publication Critical patent/JPS5648714A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/125—Discriminating pulses
    • H03K5/1252—Suppression or limitation of noise or interference

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

PURPOSE:To make it possible to eliminate a chattering noise securely by resetting two FFs by detecting dissidence between two FF outputs by exclusive OR with a clock signal at constant intervals of time. CONSTITUTION:When a chattering noise is inputted to inputs S of FFs 13A and 13B having been preset yet, logic L of the input component holds both outputs Q of FFs 13A and 13B at logic H and output 16 of gate 14 at logic L. When there is no noise, on the other hand, one output Q is at logic H, and the other at logic L, generating output 16 of logic H. In this case, gate 25 outputs signal 15 as output signal 17. Since signal 16 has logic L while the noise is generated, logic L from gate 25 is outputted as it is. Output 17 is fetched into FF24 at the rise of output clock 18 of oscillator 20 and then latched. Then, FFs 13A and 13B are reset immediately by MM22. Output 19 of FF24 generated as mentioned above is shown in the figure and the noise removed.
JP12419679A 1979-09-28 1979-09-28 Chattering noise eliminating circuit Pending JPS5648714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12419679A JPS5648714A (en) 1979-09-28 1979-09-28 Chattering noise eliminating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12419679A JPS5648714A (en) 1979-09-28 1979-09-28 Chattering noise eliminating circuit

Publications (1)

Publication Number Publication Date
JPS5648714A true JPS5648714A (en) 1981-05-02

Family

ID=14879357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12419679A Pending JPS5648714A (en) 1979-09-28 1979-09-28 Chattering noise eliminating circuit

Country Status (1)

Country Link
JP (1) JPS5648714A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926072A (en) * 1987-09-18 1990-05-15 Aisin Seiki Kabushikikaisha Noise elimination circuit
US5059834A (en) * 1989-04-25 1991-10-22 Kabushiki Kaisha Toshiba Circuit device for eliminating noise from an input signal independent of time of arrival of noise or noise width
EP0505189A2 (en) * 1991-03-19 1992-09-23 Hitachi, Ltd. Switching state detecting apparatus, control unit and transmission unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4926072A (en) * 1987-09-18 1990-05-15 Aisin Seiki Kabushikikaisha Noise elimination circuit
US5059834A (en) * 1989-04-25 1991-10-22 Kabushiki Kaisha Toshiba Circuit device for eliminating noise from an input signal independent of time of arrival of noise or noise width
EP0505189A2 (en) * 1991-03-19 1992-09-23 Hitachi, Ltd. Switching state detecting apparatus, control unit and transmission unit
US5724601A (en) * 1991-03-19 1998-03-03 Hitachi, Ltd. Switching state detecting apparatus, control unit and transmission unit for waking up a microcomputer

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