JPS5478911A - Reception circuit for dial pulse - Google Patents

Reception circuit for dial pulse

Info

Publication number
JPS5478911A
JPS5478911A JP14615877A JP14615877A JPS5478911A JP S5478911 A JPS5478911 A JP S5478911A JP 14615877 A JP14615877 A JP 14615877A JP 14615877 A JP14615877 A JP 14615877A JP S5478911 A JPS5478911 A JP S5478911A
Authority
JP
Japan
Prior art keywords
potential
contact
make
terminal
relay
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
JP14615877A
Other languages
Japanese (ja)
Inventor
Iwao Uda
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP14615877A priority Critical patent/JPS5478911A/en
Publication of JPS5478911A publication Critical patent/JPS5478911A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses
    • H04Q1/36—Pulse-correcting arrangements, e.g. for reducing effects due to interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)

Abstract

PURPOSE:To prevent the mis-reception due to the ocurrence of artificial pulse, by detecting the value of each supply current at make and brake of the dial contact with a comparator. CONSTITUTION:When the dial contact D1 is in make condition, voltage drop is caused across resistors RA and RB with the line current, the potential of the input terminal 1 of the comparator CMP is higher than that at the input terminal 2, turning on the output of COM and activating the relay A. Next, when the contact Di is in brake state, although the potential of the terminal 2 is varied with the line current, the potential at the terminal 1 is held at the same potential as the make state of the contact Di with the capacitor CA resulting that the output of CMP is turned off and the A relay is restored. Accordingly, the malfunction of the reception section due to artificial pulse can be avoided.
JP14615877A 1977-12-07 1977-12-07 Reception circuit for dial pulse Pending JPS5478911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14615877A JPS5478911A (en) 1977-12-07 1977-12-07 Reception circuit for dial pulse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14615877A JPS5478911A (en) 1977-12-07 1977-12-07 Reception circuit for dial pulse

Publications (1)

Publication Number Publication Date
JPS5478911A true JPS5478911A (en) 1979-06-23

Family

ID=15401434

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14615877A Pending JPS5478911A (en) 1977-12-07 1977-12-07 Reception circuit for dial pulse

Country Status (1)

Country Link
JP (1) JPS5478911A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57104862U (en) * 1980-12-19 1982-06-28
EP0217131A2 (en) * 1985-09-30 1987-04-08 Siemens Aktiengesellschaft Method for detecting the temporal characteristics of selecting pulses, independent of the length of the subscriber connecting lines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57104862U (en) * 1980-12-19 1982-06-28
EP0217131A2 (en) * 1985-09-30 1987-04-08 Siemens Aktiengesellschaft Method for detecting the temporal characteristics of selecting pulses, independent of the length of the subscriber connecting lines

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