JPS5651152A - Multifrequency signal system - Google Patents

Multifrequency signal system

Info

Publication number
JPS5651152A
JPS5651152A JP12761379A JP12761379A JPS5651152A JP S5651152 A JPS5651152 A JP S5651152A JP 12761379 A JP12761379 A JP 12761379A JP 12761379 A JP12761379 A JP 12761379A JP S5651152 A JPS5651152 A JP S5651152A
Authority
JP
Japan
Prior art keywords
frequencies
group
signal system
multifrequency signal
characters
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
JP12761379A
Other languages
Japanese (ja)
Inventor
Mitsuji Shimojima
Takashi Yokogawa
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 JP12761379A priority Critical patent/JPS5651152A/en
Publication of JPS5651152A publication Critical patent/JPS5651152A/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 increase the number of characters without increment of conventional high-group and low-group frequencies, by introducing the concept for time to combination of two frequencies in the multifrequency signal system. CONSTITUTION:Precedence is given to generation and stop of two frequencies, and four combinations 1-4 on the time base for two frequencies can be taken, and H and L indicate the high-group frequency and the low-group frequency respectively, and logical levels ''1'' and ''0'' indicate the oscillation state and the oscillation stop state respectively. By recognizing these four combinations, the number of characters which is four times as much as the conventional that, namely, 64 kinds of character can be discriminated.
JP12761379A 1979-10-02 1979-10-02 Multifrequency signal system Pending JPS5651152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12761379A JPS5651152A (en) 1979-10-02 1979-10-02 Multifrequency signal system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12761379A JPS5651152A (en) 1979-10-02 1979-10-02 Multifrequency signal system

Publications (1)

Publication Number Publication Date
JPS5651152A true JPS5651152A (en) 1981-05-08

Family

ID=14964413

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12761379A Pending JPS5651152A (en) 1979-10-02 1979-10-02 Multifrequency signal system

Country Status (1)

Country Link
JP (1) JPS5651152A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01126856A (en) * 1987-11-11 1989-05-18 Tokyo Gas Co Ltd Communication method
JPH07309619A (en) * 1992-11-12 1995-11-28 Rhone Poulenc Chim Alumina stabilized by lanthanum and its production

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01126856A (en) * 1987-11-11 1989-05-18 Tokyo Gas Co Ltd Communication method
JPH07309619A (en) * 1992-11-12 1995-11-28 Rhone Poulenc Chim Alumina stabilized by lanthanum and its production

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