JPS5234607A - Multifrequency signal receiving system - Google Patents

Multifrequency signal receiving system

Info

Publication number
JPS5234607A
JPS5234607A JP50094572A JP9457275A JPS5234607A JP S5234607 A JPS5234607 A JP S5234607A JP 50094572 A JP50094572 A JP 50094572A JP 9457275 A JP9457275 A JP 9457275A JP S5234607 A JPS5234607 A JP S5234607A
Authority
JP
Japan
Prior art keywords
signal receiving
receiving system
multifrequency signal
multifrequency
different
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
JP50094572A
Other languages
Japanese (ja)
Inventor
Koichi Hasegawa
Isamu Ueki
Atsushi Iwata
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP50094572A priority Critical patent/JPS5234607A/en
Publication of JPS5234607A publication Critical patent/JPS5234607A/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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:In case the working level of flequency isolation filter is different against the input signal composed of different frequency and the adjacent band wave is output with leakage, the malfunction of multifrequency signal receiving equipment can be effectively prevented.
JP50094572A 1975-08-01 1975-08-01 Multifrequency signal receiving system Pending JPS5234607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50094572A JPS5234607A (en) 1975-08-01 1975-08-01 Multifrequency signal receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50094572A JPS5234607A (en) 1975-08-01 1975-08-01 Multifrequency signal receiving system

Publications (1)

Publication Number Publication Date
JPS5234607A true JPS5234607A (en) 1977-03-16

Family

ID=14114007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50094572A Pending JPS5234607A (en) 1975-08-01 1975-08-01 Multifrequency signal receiving system

Country Status (1)

Country Link
JP (1) JPS5234607A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04318744A (en) * 1991-04-18 1992-11-10 Sharp Corp Multi-frequency receiver

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795775A (en) * 1972-10-16 1974-03-05 Microsystems Int Ltd Dual tone receiver
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver
US3914557A (en) * 1973-04-11 1975-10-21 Bell Telephone Labor Inc Multifrequency tone detecting arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795775A (en) * 1972-10-16 1974-03-05 Microsystems Int Ltd Dual tone receiver
US3914557A (en) * 1973-04-11 1975-10-21 Bell Telephone Labor Inc Multifrequency tone detecting arrangement
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04318744A (en) * 1991-04-18 1992-11-10 Sharp Corp Multi-frequency receiver

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