JPS5642460A - Push-button dialing circuit - Google Patents

Push-button dialing circuit

Info

Publication number
JPS5642460A
JPS5642460A JP11786979A JP11786979A JPS5642460A JP S5642460 A JPS5642460 A JP S5642460A JP 11786979 A JP11786979 A JP 11786979A JP 11786979 A JP11786979 A JP 11786979A JP S5642460 A JPS5642460 A JP S5642460A
Authority
JP
Japan
Prior art keywords
circuit
signal
contact
push
outputs
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
JP11786979A
Other languages
Japanese (ja)
Other versions
JPS5821467B2 (en
Inventor
Takashi Saeki
Makoto Yoshitoshi
Yutaka Nishino
Akinobu Tomimori
Akihiro Kobayashi
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.)
Toshiba Corp
Iwatsu Electric Co Ltd
NEC Corp
NTT Inc
Original Assignee
Toshiba Corp
Iwatsu Electric Co Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Tokyo Shibaura Electric Co Ltd
Nippon Electric Co 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 Toshiba Corp, Iwatsu Electric Co Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Tokyo Shibaura Electric Co Ltd, Nippon Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11786979A priority Critical patent/JPS5821467B2/en
Publication of JPS5642460A publication Critical patent/JPS5642460A/en
Publication of JPS5821467B2 publication Critical patent/JPS5821467B2/en
Expired 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
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To prevent malfunction when push-button dial switches are turned on-off, by providing a key interface circuit that generates and outputs a common contact signal electrically and a circuit that prevents a contact defective signal from the above-mentioned circuit. CONSTITUTION:When one of contacts S11-S22 of the push-button dial switch part is turned on, key interface circuit 21 outputs a contact signal, which correspond to the ON contact, to contact defective preventing circuit 22. At the same time, common contact signal C that is in common to all contacts is sent to switch circuit 26 via OR circuit 25. Synchronizing with signal C, circuit 26 puts electric-power- source stabilizing circuit 27 into operation to supply circuit 22, oscillating circuit 23 and output circuit 24 with electric power. Circuit 22 counts clock pulses from the output of circuit 23 and, when counting up to a fixed count value, sneds the contact signal from circuit 21 to circuit 23 to outputs a dial signal of a frequency, which corresponds to the contact signal, from circuit 23 via circuit 24. Thus, malfunction due to chattering when the dial switch is turned on-off is prevented.
JP11786979A 1979-09-17 1979-09-17 push button dial circuit Expired JPS5821467B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11786979A JPS5821467B2 (en) 1979-09-17 1979-09-17 push button dial circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11786979A JPS5821467B2 (en) 1979-09-17 1979-09-17 push button dial circuit

Publications (2)

Publication Number Publication Date
JPS5642460A true JPS5642460A (en) 1981-04-20
JPS5821467B2 JPS5821467B2 (en) 1983-04-30

Family

ID=14722292

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11786979A Expired JPS5821467B2 (en) 1979-09-17 1979-09-17 push button dial circuit

Country Status (1)

Country Link
JP (1) JPS5821467B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6387014U (en) * 1986-11-26 1988-06-07

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0476481U (en) * 1990-11-13 1992-07-03

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6387014U (en) * 1986-11-26 1988-06-07

Also Published As

Publication number Publication date
JPS5821467B2 (en) 1983-04-30

Similar Documents

Publication Publication Date Title
ES414647A1 (en) Telephone dialing arrangement
JPS5642460A (en) Push-button dialing circuit
JPS5245370A (en) Electronic wristwatch provided with locking circuit
JPS53138768A (en) Electronic watch with alarm
JPS5342079A (en) Electronic watch
JPS538841A (en) High frequency heater
JPS5619479A (en) Electronic timer
JPS51129266A (en) Electronic watch
JPS57150221A (en) On and off detecting circuit of switch
JPS56129487A (en) Channel selection interlocking device
JPS5243466A (en) Electronic watch
JPS5523487A (en) Corrector of electronic watch
JPS5589782A (en) Electronic watch
JPS6464528A (en) Output voltage switching circuit
JPS53127771A (en) Malfunction preventor of electronic type digital watches
JPS539578A (en) Electronic watch
JPS5249066A (en) Electronic watch
JPS5249060A (en) Switch of electronic watch
JPS5485606A (en) Push-button dial telephone set
JPS57206935A (en) Digital phase controlling circuit
JPS54848A (en) Oscillator circuit
JPS5297448A (en) Action limiting circuit at wrong set number time
JPS54131200A (en) Electrospark machine
JPS5346059A (en) Electronic circuit for watches
JPS5432961A (en) Preset electronic counter