JPS52108A - Receiver for push-button telephone - Google Patents

Receiver for push-button telephone

Info

Publication number
JPS52108A
JPS52108A JP50076371A JP7637175A JPS52108A JP S52108 A JPS52108 A JP S52108A JP 50076371 A JP50076371 A JP 50076371A JP 7637175 A JP7637175 A JP 7637175A JP S52108 A JPS52108 A JP S52108A
Authority
JP
Japan
Prior art keywords
receiver
push
button telephone
frequencies
telephone
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
JP50076371A
Other languages
Japanese (ja)
Inventor
Heiichiro Mita
Hikoichi Gomiyo
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.)
DenDen Koukoku Co Ltd
Original Assignee
DenDen Koukoku 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 DenDen Koukoku Co Ltd filed Critical DenDen Koukoku Co Ltd
Priority to JP50076371A priority Critical patent/JPS52108A/en
Publication of JPS52108A publication Critical patent/JPS52108A/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
    • H04Q1/453—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)
  • Mobile Radio Communication Systems (AREA)
  • Filters And Equalizers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To tune and detect sensitively seven frequencies from 977 to 1,477Hz of narrow range of signal frequencies of a pushbutton telephone in easy and less expensive manner.
JP50076371A 1975-06-21 1975-06-21 Receiver for push-button telephone Pending JPS52108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50076371A JPS52108A (en) 1975-06-21 1975-06-21 Receiver for push-button telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50076371A JPS52108A (en) 1975-06-21 1975-06-21 Receiver for push-button telephone

Publications (1)

Publication Number Publication Date
JPS52108A true JPS52108A (en) 1977-01-05

Family

ID=13603477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50076371A Pending JPS52108A (en) 1975-06-21 1975-06-21 Receiver for push-button telephone

Country Status (1)

Country Link
JP (1) JPS52108A (en)

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