JPS56149889A - Push-botton telephone signal receiving system - Google Patents

Push-botton telephone signal receiving system

Info

Publication number
JPS56149889A
JPS56149889A JP5389380A JP5389380A JPS56149889A JP S56149889 A JPS56149889 A JP S56149889A JP 5389380 A JP5389380 A JP 5389380A JP 5389380 A JP5389380 A JP 5389380A JP S56149889 A JPS56149889 A JP S56149889A
Authority
JP
Japan
Prior art keywords
pass filter
band
sampling switch
botton
push
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
JP5389380A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0135559B2 (enrdf_load_stackoverflow
Inventor
Takao Nishitani
Tadaharu Kato
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
Original Assignee
NEC 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 Electric Co Ltd filed Critical NEC Corp
Priority to JP5389380A priority Critical patent/JPS56149889A/ja
Priority to US06/251,829 priority patent/US4395595A/en
Priority to FR8107177A priority patent/FR2481542A1/fr
Priority to CA000375974A priority patent/CA1155985A/en
Publication of JPS56149889A publication Critical patent/JPS56149889A/ja
Publication of JPH0135559B2 publication Critical patent/JPH0135559B2/ja
Granted 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
JP5389380A 1980-04-23 1980-04-23 Push-botton telephone signal receiving system Granted JPS56149889A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5389380A JPS56149889A (en) 1980-04-23 1980-04-23 Push-botton telephone signal receiving system
US06/251,829 US4395595A (en) 1980-04-23 1981-04-07 Digital pushbutton signalling receiver
FR8107177A FR2481542A1 (fr) 1980-04-23 1981-04-09 Recepteur de signalisation numerique a bouton-poussoir
CA000375974A CA1155985A (en) 1980-04-23 1981-04-22 Digital pushbutton signalling receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5389380A JPS56149889A (en) 1980-04-23 1980-04-23 Push-botton telephone signal receiving system

Publications (2)

Publication Number Publication Date
JPS56149889A true JPS56149889A (en) 1981-11-19
JPH0135559B2 JPH0135559B2 (enrdf_load_stackoverflow) 1989-07-26

Family

ID=12955396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5389380A Granted JPS56149889A (en) 1980-04-23 1980-04-23 Push-botton telephone signal receiving system

Country Status (1)

Country Link
JP (1) JPS56149889A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56153897A (en) * 1980-04-30 1981-11-28 Nec Corp Receiving device for push-button telephone signal

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5173809A (enrdf_load_stackoverflow) * 1974-12-23 1976-06-26 Nippon Electric Co

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5173809A (enrdf_load_stackoverflow) * 1974-12-23 1976-06-26 Nippon Electric Co

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56153897A (en) * 1980-04-30 1981-11-28 Nec Corp Receiving device for push-button telephone signal

Also Published As

Publication number Publication date
JPH0135559B2 (enrdf_load_stackoverflow) 1989-07-26

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