JPS5224408A - Multi-frequenc y wave signal detecting system - Google Patents

Multi-frequenc y wave signal detecting system

Info

Publication number
JPS5224408A
JPS5224408A JP50100184A JP10018475A JPS5224408A JP S5224408 A JPS5224408 A JP S5224408A JP 50100184 A JP50100184 A JP 50100184A JP 10018475 A JP10018475 A JP 10018475A JP S5224408 A JPS5224408 A JP S5224408A
Authority
JP
Japan
Prior art keywords
wave signal
frequenc
detecting system
signal detecting
signal
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
JP50100184A
Other languages
Japanese (ja)
Inventor
Akio Suehiro
Hisao Sakai
Mitsugi Sakaguchi
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.)
NIPPO TSUSHIN KOGYO KK
Hitachi Ltd
Original Assignee
NIPPO TSUSHIN KOGYO KK
Hitachi 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 NIPPO TSUSHIN KOGYO KK, Hitachi Ltd filed Critical NIPPO TSUSHIN KOGYO KK
Priority to JP50100184A priority Critical patent/JPS5224408A/en
Publication of JPS5224408A publication Critical patent/JPS5224408A/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
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To make a multip processing to a multi-frequendy signal (of dozens of lines) from many key tepephone sets with a single multi-wave receiver, and to detect a multi-frequency wave signal from the key telephone sets in the voice response device.
JP50100184A 1975-08-20 1975-08-20 Multi-frequenc y wave signal detecting system Pending JPS5224408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50100184A JPS5224408A (en) 1975-08-20 1975-08-20 Multi-frequenc y wave signal detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50100184A JPS5224408A (en) 1975-08-20 1975-08-20 Multi-frequenc y wave signal detecting system

Publications (1)

Publication Number Publication Date
JPS5224408A true JPS5224408A (en) 1977-02-23

Family

ID=14267208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50100184A Pending JPS5224408A (en) 1975-08-20 1975-08-20 Multi-frequenc y wave signal detecting system

Country Status (1)

Country Link
JP (1) JPS5224408A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63316993A (en) * 1987-06-19 1988-12-26 Nec Corp Line switching equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63316993A (en) * 1987-06-19 1988-12-26 Nec Corp Line switching equipment

Similar Documents

Publication Publication Date Title
JPS5224408A (en) Multi-frequenc y wave signal detecting system
YU62277A (en) Receiver for detecting two frequencies from the range in a multifrequency tone signal
JPS5213706A (en) Key telephone system
JPS5347738A (en) Detection circuit for process request
JPS5216249A (en) Test system for line and subscriber call meter
JPS51112218A (en) Multifrequency signal receiver
JPS5217703A (en) Public telephone
JPS51135401A (en) Automatical station selection device
JPS52104009A (en) Caller s number receiving system
JPS51130187A (en) Synchronizing equipment
JPS5251805A (en) Key telephone device
JPS5436108A (en) Malicious call detection system
JPS51148304A (en) Circuit to discriminate speech signals and audible signals
JPS5435604A (en) Ringing system of push-button telephone set
JPS51138107A (en) Signal detection output system
JPS5263005A (en) Digital answering device
JPS52108A (en) Receiver for push-button telephone
JPS51138112A (en) Signal detecting device
JPS52146102A (en) Terminal equipment in a simple data communicating system
JPS5640392A (en) Nondelay starting trunk control system
JPS5431884A (en) Abnormality detecting apparatus in transmission system
JPS5413720A (en) Communication circuit controller
JPS51123504A (en) Signal identification circuit
JPS5687963A (en) Detection system of incoming call
JPS5215206A (en) Detector circuit for key telephone

Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term