JPS5478004A - Switch circuit of push-button dial telephone set - Google Patents

Switch circuit of push-button dial telephone set

Info

Publication number
JPS5478004A
JPS5478004A JP14540377A JP14540377A JPS5478004A JP S5478004 A JPS5478004 A JP S5478004A JP 14540377 A JP14540377 A JP 14540377A JP 14540377 A JP14540377 A JP 14540377A JP S5478004 A JPS5478004 A JP S5478004A
Authority
JP
Japan
Prior art keywords
output
circuit
contact
outputs
input
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
JP14540377A
Other languages
Japanese (ja)
Other versions
JPS569816B2 (en
Inventor
Shinji Nishimura
Makoto Yoshitoshi
Koichi Matsumoto
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP14540377A priority Critical patent/JPS5478004A/en
Publication of JPS5478004A publication Critical patent/JPS5478004A/en
Publication of JPS569816B2 publication Critical patent/JPS569816B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE:To make it possible to transmit signals according to a button depression time and prevent malfunction by operating a frequency divider and FF by the signal at a contact switch time of a dial switch. CONSTITUTION:Logical operation circuit E where outputs (a) and (b), which are obtained by converting the output of mechanical contact A1 to electric signals in converter B1, and output (c), which is obtained by inverting the output of contact A1 in inverter C1, are used to input outputs (a) and (b) and output (k) of FF circuit K1 which outputs button information corresponding to contact A1, FF circuit F which is set by the output of circuit E, logical operation circuit G where the input and the output of circit F are inputted, a counter circuit which is constituted by FF circuit H controlled by the output of circuit G, logical output (i) between output (h) of the counter circuit and outputs (a) and (b), and logical output (j) between output (h) and output (c) are provided. Then, outputs (i) and (j) are defined as the input of circuit K1, and the inversion time of output (h) is set longer than the chattering and contact failure time of contact A1 by the counter circuit.
JP14540377A 1977-12-02 1977-12-02 Switch circuit of push-button dial telephone set Granted JPS5478004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14540377A JPS5478004A (en) 1977-12-02 1977-12-02 Switch circuit of push-button dial telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14540377A JPS5478004A (en) 1977-12-02 1977-12-02 Switch circuit of push-button dial telephone set

Publications (2)

Publication Number Publication Date
JPS5478004A true JPS5478004A (en) 1979-06-21
JPS569816B2 JPS569816B2 (en) 1981-03-04

Family

ID=15384439

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14540377A Granted JPS5478004A (en) 1977-12-02 1977-12-02 Switch circuit of push-button dial telephone set

Country Status (1)

Country Link
JP (1) JPS5478004A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5624633A (en) * 1979-08-03 1981-03-09 Nec Corp Key input control system
JPS58109918A (en) * 1981-12-23 1983-06-30 Hitachi Ltd signal acquisition device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5855872U (en) * 1981-10-12 1983-04-15 柿木　義雄 Removal tool for ridge covering material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5624633A (en) * 1979-08-03 1981-03-09 Nec Corp Key input control system
JPS58109918A (en) * 1981-12-23 1983-06-30 Hitachi Ltd signal acquisition device

Also Published As

Publication number Publication date
JPS569816B2 (en) 1981-03-04

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