JPS556941A - Signal reception system - Google Patents

Signal reception system

Info

Publication number
JPS556941A
JPS556941A JP7939378A JP7939378A JPS556941A JP S556941 A JPS556941 A JP S556941A JP 7939378 A JP7939378 A JP 7939378A JP 7939378 A JP7939378 A JP 7939378A JP S556941 A JPS556941 A JP S556941A
Authority
JP
Japan
Prior art keywords
signal
received
pushphone
relay
case
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
JP7939378A
Other languages
Japanese (ja)
Inventor
Hideo Tanaka
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 JP7939378A priority Critical patent/JPS556941A/en
Publication of JPS556941A publication Critical patent/JPS556941A/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

Landscapes

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

Abstract

PURPOSE:To ensure an accurate reception for both the double frequency combination signal and the single frequency signal via one unit of the receiver by deciding normal and accepting the signals in case both the 1st and 2nd digits feature the same signal type and on the other hand deciding erroneous and deleting the signals in case the signal type differs between the two digits. CONSTITUTION:When the signal sent from the pushphone is received as the 1st digit of the signal, relay MF operates to keep the operation. In case the single frequency signal is received when the pushphone signal is received at the 1st digit with the operation of relay MF kept, i.e., while the second and subsequent digits of the pushphone signal are being received, alarm relay AL is actuated to alarm the malfunction.
JP7939378A 1978-06-30 1978-06-30 Signal reception system Pending JPS556941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7939378A JPS556941A (en) 1978-06-30 1978-06-30 Signal reception system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7939378A JPS556941A (en) 1978-06-30 1978-06-30 Signal reception system

Publications (1)

Publication Number Publication Date
JPS556941A true JPS556941A (en) 1980-01-18

Family

ID=13688608

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7939378A Pending JPS556941A (en) 1978-06-30 1978-06-30 Signal reception system

Country Status (1)

Country Link
JP (1) JPS556941A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector

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