JPS51113518A - Multifrequency signal receiver - Google Patents

Multifrequency signal receiver

Info

Publication number
JPS51113518A
JPS51113518A JP50038705A JP3870575A JPS51113518A JP S51113518 A JPS51113518 A JP S51113518A JP 50038705 A JP50038705 A JP 50038705A JP 3870575 A JP3870575 A JP 3870575A JP S51113518 A JPS51113518 A JP S51113518A
Authority
JP
Japan
Prior art keywords
multifrequency signal
signal receiver
multifrequency
signal
frequency
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
JP50038705A
Other languages
Japanese (ja)
Other versions
JPS5820513B2 (en
Inventor
Atsushi Tomosawa
Kunihiko Niwa
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 JP50038705A priority Critical patent/JPS5820513B2/en
Publication of JPS51113518A publication Critical patent/JPS51113518A/en
Publication of JPS5820513B2 publication Critical patent/JPS5820513B2/en
Expired 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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To prevent malfunction, which may be caused by false signal, of multifrequency signal receiver which measures frequency of multifrequency signal after having converted each group of sinusoidal waves obtained by separating frequency of the said multifrequency signal into square waves in comparison with threshold value.
JP50038705A 1975-03-31 1975-03-31 Tashiyuuhashingoujiyushinki Expired JPS5820513B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50038705A JPS5820513B2 (en) 1975-03-31 1975-03-31 Tashiyuuhashingoujiyushinki

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50038705A JPS5820513B2 (en) 1975-03-31 1975-03-31 Tashiyuuhashingoujiyushinki

Publications (2)

Publication Number Publication Date
JPS51113518A true JPS51113518A (en) 1976-10-06
JPS5820513B2 JPS5820513B2 (en) 1983-04-23

Family

ID=12532719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50038705A Expired JPS5820513B2 (en) 1975-03-31 1975-03-31 Tashiyuuhashingoujiyushinki

Country Status (1)

Country Link
JP (1) JPS5820513B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6242586U (en) * 1985-09-03 1987-03-14
JPH042013U (en) * 1990-04-23 1992-01-09

Also Published As

Publication number Publication date
JPS5820513B2 (en) 1983-04-23

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