JPS56131286A - Digital multifrequency signal receiver - Google Patents

Digital multifrequency signal receiver

Info

Publication number
JPS56131286A
JPS56131286A JP3445680A JP3445680A JPS56131286A JP S56131286 A JPS56131286 A JP S56131286A JP 3445680 A JP3445680 A JP 3445680A JP 3445680 A JP3445680 A JP 3445680A JP S56131286 A JPS56131286 A JP S56131286A
Authority
JP
Japan
Prior art keywords
outputs
dft
circuit
circuit groups
circuits
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
JP3445680A
Other languages
English (en)
Japanese (ja)
Other versions
JPS637509B2 (enExample
Inventor
Tadaharu Kato
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 JP3445680A priority Critical patent/JPS56131286A/ja
Publication of JPS56131286A publication Critical patent/JPS56131286A/ja
Publication of JPS637509B2 publication Critical patent/JPS637509B2/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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
JP3445680A 1980-03-18 1980-03-18 Digital multifrequency signal receiver Granted JPS56131286A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3445680A JPS56131286A (en) 1980-03-18 1980-03-18 Digital multifrequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3445680A JPS56131286A (en) 1980-03-18 1980-03-18 Digital multifrequency signal receiver

Publications (2)

Publication Number Publication Date
JPS56131286A true JPS56131286A (en) 1981-10-14
JPS637509B2 JPS637509B2 (enExample) 1988-02-17

Family

ID=12414743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3445680A Granted JPS56131286A (en) 1980-03-18 1980-03-18 Digital multifrequency signal receiver

Country Status (1)

Country Link
JP (1) JPS56131286A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7227943B2 (en) 2001-12-06 2007-06-05 Ricoh Company, Ltd. Tone detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7227943B2 (en) 2001-12-06 2007-06-05 Ricoh Company, Ltd. Tone detector

Also Published As

Publication number Publication date
JPS637509B2 (enExample) 1988-02-17

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