JPS55156403A - Malfunction preventing circuit - Google Patents

Malfunction preventing circuit

Info

Publication number
JPS55156403A
JPS55156403A JP6474179A JP6474179A JPS55156403A JP S55156403 A JPS55156403 A JP S55156403A JP 6474179 A JP6474179 A JP 6474179A JP 6474179 A JP6474179 A JP 6474179A JP S55156403 A JPS55156403 A JP S55156403A
Authority
JP
Japan
Prior art keywords
output
malfunction
circuit
sine wave
level
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
JP6474179A
Other languages
Japanese (ja)
Other versions
JPS6156907B2 (en
Inventor
Kaneyuki Nishihara
Akinobu Tomimori
Makoto Yoshitoshi
Yutaka Nishino
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6474179A priority Critical patent/JPS55156403A/en
Publication of JPS55156403A publication Critical patent/JPS55156403A/en
Publication of JPS6156907B2 publication Critical patent/JPS6156907B2/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
    • H04M1/505—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 signals generated in digital form

Abstract

PURPOSE:To prevent the DC level of a malfunction preventing circuit from varying in malfunction in push-button dialing while making the phase angle of the sine wave of a D/A converter zero. CONSTITUTION:As far as contact group 1 of a push-button dial is operated normally, programmable dividing circuit 3 divides the output of oscillating circuit 2, a series/parallel (S-P) converting circuit provides parallel conversion, and D/A converting circuit 5 dends out a sine wave as dial signal (c). Once malfunction happens, malfunction preventing circuit 6 generates an output to turn ON intermediate input terminal (m) of D/A converting circuit 5 and OFF all of the remainder and to output terminals, the same zero-potential DC level as when a sine wave of zero phase angle is output is output, so that the DC level will be unchanged when the sine wave is output normally and the output is stopped due to the malfunction.
JP6474179A 1979-05-24 1979-05-24 Malfunction preventing circuit Granted JPS55156403A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6474179A JPS55156403A (en) 1979-05-24 1979-05-24 Malfunction preventing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6474179A JPS55156403A (en) 1979-05-24 1979-05-24 Malfunction preventing circuit

Publications (2)

Publication Number Publication Date
JPS55156403A true JPS55156403A (en) 1980-12-05
JPS6156907B2 JPS6156907B2 (en) 1986-12-04

Family

ID=13266873

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6474179A Granted JPS55156403A (en) 1979-05-24 1979-05-24 Malfunction preventing circuit

Country Status (1)

Country Link
JP (1) JPS55156403A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10233923B2 (en) 2013-08-20 2019-03-19 Heishin Techno Werke Ltd. Sliding member for pump and pump operation state detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10233923B2 (en) 2013-08-20 2019-03-19 Heishin Techno Werke Ltd. Sliding member for pump and pump operation state detection system

Also Published As

Publication number Publication date
JPS6156907B2 (en) 1986-12-04

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