JPH0150152B2 - - Google Patents

Info

Publication number
JPH0150152B2
JPH0150152B2 JP56030253A JP3025381A JPH0150152B2 JP H0150152 B2 JPH0150152 B2 JP H0150152B2 JP 56030253 A JP56030253 A JP 56030253A JP 3025381 A JP3025381 A JP 3025381A JP H0150152 B2 JPH0150152 B2 JP H0150152B2
Authority
JP
Japan
Prior art keywords
output
input signal
input
frequency
angular 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.)
Expired
Application number
JP56030253A
Other languages
English (en)
Japanese (ja)
Other versions
JPS57143965A (en
Inventor
Kensaku Fujii
Yasumasa Iwase
Yoshikatsu Shiraishi
Akira Fukui
Kazuto Hirose
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
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
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 Fujitsu Ltd, Hitachi Ltd, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP56030253A priority Critical patent/JPS57143965A/ja
Publication of JPS57143965A publication Critical patent/JPS57143965A/ja
Publication of JPH0150152B2 publication Critical patent/JPH0150152B2/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
    • H04Q1/4575—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 which are transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
JP56030253A 1981-03-03 1981-03-03 Multifrequency signal receiver Granted JPS57143965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56030253A JPS57143965A (en) 1981-03-03 1981-03-03 Multifrequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56030253A JPS57143965A (en) 1981-03-03 1981-03-03 Multifrequency signal receiver

Publications (2)

Publication Number Publication Date
JPS57143965A JPS57143965A (en) 1982-09-06
JPH0150152B2 true JPH0150152B2 (en]) 1989-10-27

Family

ID=12298541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56030253A Granted JPS57143965A (en) 1981-03-03 1981-03-03 Multifrequency signal receiver

Country Status (1)

Country Link
JP (1) JPS57143965A (en])

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5442696A (en) * 1991-12-31 1995-08-15 At&T Corp. Method and apparatus for detecting control signals

Also Published As

Publication number Publication date
JPS57143965A (en) 1982-09-06

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