JPS57112196A - Ringing detection circuit - Google Patents

Ringing detection circuit

Info

Publication number
JPS57112196A
JPS57112196A JP18785080A JP18785080A JPS57112196A JP S57112196 A JPS57112196 A JP S57112196A JP 18785080 A JP18785080 A JP 18785080A JP 18785080 A JP18785080 A JP 18785080A JP S57112196 A JPS57112196 A JP S57112196A
Authority
JP
Japan
Prior art keywords
monostable multivibrator
signal
ringing
ringing signal
waveform
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
JP18785080A
Other languages
Japanese (ja)
Inventor
Kunihiko Kawanishi
Katsuhiko Furukawa
Takashi Nagato
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP18785080A priority Critical patent/JPS57112196A/en
Publication of JPS57112196A publication Critical patent/JPS57112196A/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
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To obtain a stable DC detection signal without distortion, by detecting an AC ringing signal with a monostable multivibrator. CONSTITUTION:When a ringing signal A from main trunks 6a, 6b is applied to a ringing signal reception circuit 5, a rectifying circuit consisting of diodes D1- D4 makes full-wave rectification for the said ringing signal A and the result is applied to the input side of a photo coupler 1. The output of the photo coupler 1 is a rectangular wave as shown in waveform B and inputted to a monostable multivibrator 1 as a trigger signal. As a result, the monostable multivibrator 1 outputs a detection signal as waveform C. The output pulse width Wp of the monostable multivibrator 1 is set slightly wider than the width Wt of a trigger signal B.
JP18785080A 1980-12-29 1980-12-29 Ringing detection circuit Pending JPS57112196A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18785080A JPS57112196A (en) 1980-12-29 1980-12-29 Ringing detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18785080A JPS57112196A (en) 1980-12-29 1980-12-29 Ringing detection circuit

Publications (1)

Publication Number Publication Date
JPS57112196A true JPS57112196A (en) 1982-07-13

Family

ID=16213304

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18785080A Pending JPS57112196A (en) 1980-12-29 1980-12-29 Ringing detection circuit

Country Status (1)

Country Link
JP (1) JPS57112196A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156053A (en) * 1983-02-24 1984-09-05 Nippon Dentsu Kensetsu Kk Call signal converter added to telephone set
JPS6399663A (en) * 1986-10-15 1988-04-30 Tokyo Electric Co Ltd Signal detecting device for information communication equipment
JPS647458U (en) * 1987-07-01 1989-01-17

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156053A (en) * 1983-02-24 1984-09-05 Nippon Dentsu Kensetsu Kk Call signal converter added to telephone set
JPH0320945B2 (en) * 1983-02-24 1991-03-20 Nippon Dentsu Kensetsu Kk
JPS6399663A (en) * 1986-10-15 1988-04-30 Tokyo Electric Co Ltd Signal detecting device for information communication equipment
JPS647458U (en) * 1987-07-01 1989-01-17

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