JPS57206189A - Detecting system of multifrequency signal - Google Patents

Detecting system of multifrequency signal

Info

Publication number
JPS57206189A
JPS57206189A JP56091823A JP9182381A JPS57206189A JP S57206189 A JPS57206189 A JP S57206189A JP 56091823 A JP56091823 A JP 56091823A JP 9182381 A JP9182381 A JP 9182381A JP S57206189 A JPS57206189 A JP S57206189A
Authority
JP
Japan
Prior art keywords
output
supplied
comparator
rectification
filter
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
JP56091823A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6317275B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html
Inventor
Hirotsugu Ishikawa
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 JP56091823A priority Critical patent/JPS57206189A/ja
Publication of JPS57206189A publication Critical patent/JPS57206189A/ja
Publication of JPS6317275B2 publication Critical patent/JPS6317275B2/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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
JP56091823A 1981-06-15 1981-06-15 Detecting system of multifrequency signal Granted JPS57206189A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56091823A JPS57206189A (en) 1981-06-15 1981-06-15 Detecting system of multifrequency signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56091823A JPS57206189A (en) 1981-06-15 1981-06-15 Detecting system of multifrequency signal

Publications (2)

Publication Number Publication Date
JPS57206189A true JPS57206189A (en) 1982-12-17
JPS6317275B2 JPS6317275B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1988-04-13

Family

ID=14037331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56091823A Granted JPS57206189A (en) 1981-06-15 1981-06-15 Detecting system of multifrequency signal

Country Status (1)

Country Link
JP (1) JPS57206189A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Also Published As

Publication number Publication date
JPS6317275B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1988-04-13

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