CA1017252A - Debounce filter for keyboard - Google Patents

Debounce filter for keyboard

Info

Publication number
CA1017252A
CA1017252A CA207,301A CA207301A CA1017252A CA 1017252 A CA1017252 A CA 1017252A CA 207301 A CA207301 A CA 207301A CA 1017252 A CA1017252 A CA 1017252A
Authority
CA
Canada
Prior art keywords
keyboard
debounce filter
debounce
filter
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.)
Expired
Application number
CA207,301A
Other languages
English (en)
Other versions
CA207301S (en
Inventor
Robert E. Marin
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.)
AT&T Teletype Corp
Original Assignee
Teletype Corp
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 Teletype Corp filed Critical Teletype Corp
Application granted granted Critical
Publication of CA1017252A publication Critical patent/CA1017252A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/01—Details
    • H03K3/013—Modifications of generator to prevent operation by noise or interference
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/20—Dynamic coding, i.e. by key scanning

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Input From Keyboards Or The Like (AREA)
CA207,301A 1973-11-29 1974-08-19 Debounce filter for keyboard Expired CA1017252A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US420124A US3886543A (en) 1973-11-29 1973-11-29 Debounce logic for keyboard

Publications (1)

Publication Number Publication Date
CA1017252A true CA1017252A (en) 1977-09-13

Family

ID=23665177

Family Applications (1)

Application Number Title Priority Date Filing Date
CA207,301A Expired CA1017252A (en) 1973-11-29 1974-08-19 Debounce filter for keyboard

Country Status (6)

Country Link
US (1) US3886543A (it)
JP (1) JPS5088935A (it)
CA (1) CA1017252A (it)
DE (1) DE2455433A1 (it)
GB (1) GB1484705A (it)
IT (1) IT1025900B (it)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106011A (en) * 1975-10-24 1978-08-08 Tektronix, Inc. Keyboard circuit
US4024534A (en) * 1975-11-24 1977-05-17 Xerox Corporation Keyboard encoding with repeat key pause
US4140039A (en) * 1976-04-12 1979-02-20 Faulkner Alfred H Hand held synthesizer
US4117758A (en) * 1976-11-04 1978-10-03 Kimball International, Inc. Binary word debouncer
US4174652A (en) * 1977-08-26 1979-11-20 Teledyne Industries, Inc. Method and apparatus for recording digital signals for actuating solenoid
JPS55119730A (en) * 1979-03-09 1980-09-13 Hitachi Ltd Input unit
DE3104130C2 (de) * 1981-02-06 1984-05-10 Kautt & Bux Kg, 7000 Stuttgart "Elektromagnetisch angetriebenes Schlaggerät"
US4853685A (en) * 1988-04-29 1989-08-01 Baker Industries, Inc. Switch monitoring arrangement with remote adjustment capability having debounce circuitry for accurate state determination
US5457455A (en) * 1992-09-22 1995-10-10 Rockwell International Corporation Real time keyboard scanner
US5315539A (en) * 1992-09-24 1994-05-24 Xerox Corporation Method and apparatus for debouncing signals
US5440072A (en) * 1992-09-25 1995-08-08 Willis; Raymon A. System for rejuvenating vintage organs and pianos
US5386159A (en) * 1993-06-30 1995-01-31 Harris Corporation Glitch suppressor circuit and method
US7203779B2 (en) * 2002-01-30 2007-04-10 Stmicroelectronics, Inc. Fast turn-off slow turn-on arbitrator for reducing tri-state driver power dissipation on a shared bus
US20030163627A1 (en) * 2002-02-28 2003-08-28 Deng Brian Tse Enhanced universal serial bus (USB) bus monitor controller
TWI232028B (en) * 2004-04-23 2005-05-01 Sunplus Technology Co Ltd Gain circuit, A/D converter circuit and common operational amplifier thereof
US7230548B2 (en) * 2004-09-28 2007-06-12 Broadcom Corporation Method and apparatus for high performance key detection with key debounce
US7786901B2 (en) * 2007-04-03 2010-08-31 Motorola, Inc. Key press registration in an electronic device with moveable housings
US7984226B2 (en) * 2009-06-10 2011-07-19 Hand Held Products, Inc. Method for sensing and auto switching between two USB input ports to a single port on the PDA
US8847439B2 (en) * 2011-10-20 2014-09-30 Fisher Controls International, Llc Multiple-contact switches
FR3040091B1 (fr) * 2015-08-10 2017-08-25 Sagemcom Broadband Sas Procede de parametrage de la reactivite d’un dispositif electronique observee suite a la reception d’une commande emise depuis un equipement de controle voisin et dispositif adapte pour la mise en oeuvre d’un tel procede
CN105680873B (zh) * 2016-01-05 2018-06-26 湖南工业大学 独立式键盘扫描编码电路

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448254A (en) * 1965-07-28 1969-06-03 Anker Werke Ag Data checking system
US3675239A (en) * 1970-09-14 1972-07-04 Ncr Co Unlimited roll keyboard circuit
US3792466A (en) * 1972-05-31 1974-02-12 Mos Technology Inc Keyboard entry system with n-key rollover and n-key lockout protection

Also Published As

Publication number Publication date
GB1484705A (en) 1977-09-01
IT1025900B (it) 1978-08-30
US3886543A (en) 1975-05-27
DE2455433A1 (de) 1975-06-05
JPS5088935A (it) 1975-07-17

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