JPS56166690A - Multifrequency signal receiver - Google Patents

Multifrequency signal receiver

Info

Publication number
JPS56166690A
JPS56166690A JP6991880A JP6991880A JPS56166690A JP S56166690 A JPS56166690 A JP S56166690A JP 6991880 A JP6991880 A JP 6991880A JP 6991880 A JP6991880 A JP 6991880A JP S56166690 A JPS56166690 A JP S56166690A
Authority
JP
Japan
Prior art keywords
outputs
multifrequency signal
frequencies
circuits
output level
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
JP6991880A
Other languages
Japanese (ja)
Inventor
Toshio Shimoe
Hitoshi Imagawa
Kazuhiro Maruyama
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
NEC Corp
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, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP6991880A priority Critical patent/JPS56166690A/en
Publication of JPS56166690A publication Critical patent/JPS56166690A/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:To simplify the constitution of a receiver by modulating multifrequency signal to make respective frequency components identical through detecting respective frequencies of the multifrequency signal, and then by calculating an output level via a band-pass filter having said frequency as a center frequency. CONSTITUTION:A multifrequency signal from an input terminal 1 is inputted to detecting circuits 2a-2n which correspond to its respective frequencies and their outputs are modulated by modulating circuits 3a-3n to make identical the frequencies of respective frequency components. The outputs of those modulating circuits 3a-3n are applied to band-pass filters 4a-4n whose center frequencies are equal and their outputs are squared by output level calculation parts 5a-5n to discriminate an output level. The outputs of those detecting circuits 2a-2n are inputted to an output logical circuit 6, and the outputs of the calculation parts 5a-5n are logically processed to discriminate a dial number, control signal, etc., of the multifrequency signal.
JP6991880A 1980-05-26 1980-05-26 Multifrequency signal receiver Pending JPS56166690A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6991880A JPS56166690A (en) 1980-05-26 1980-05-26 Multifrequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6991880A JPS56166690A (en) 1980-05-26 1980-05-26 Multifrequency signal receiver

Publications (1)

Publication Number Publication Date
JPS56166690A true JPS56166690A (en) 1981-12-21

Family

ID=13416544

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6991880A Pending JPS56166690A (en) 1980-05-26 1980-05-26 Multifrequency signal receiver

Country Status (1)

Country Link
JP (1) JPS56166690A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004260775A (en) * 2003-02-28 2004-09-16 Hitachi Kokusai Electric Inc Receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004260775A (en) * 2003-02-28 2004-09-16 Hitachi Kokusai Electric Inc Receiver

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