FR2272549B1 - - Google Patents

Info

Publication number
FR2272549B1
FR2272549B1 FR7417652A FR7417652A FR2272549B1 FR 2272549 B1 FR2272549 B1 FR 2272549B1 FR 7417652 A FR7417652 A FR 7417652A FR 7417652 A FR7417652 A FR 7417652A FR 2272549 B1 FR2272549 B1 FR 2272549B1
Authority
FR
France
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
FR7417652A
Other languages
French (fr)
Other versions
FR2272549A1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7417652A priority Critical patent/FR2272549A1/fr
Publication of FR2272549A1 publication Critical patent/FR2272549A1/fr
Application granted granted Critical
Publication of FR2272549B1 publication Critical patent/FR2272549B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
    • 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)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Analogue/Digital Conversion (AREA)
FR7417652A 1974-05-21 1974-05-21 Frequency coded signal receiving and decoding device - has channels with fixed frequency and converting circuits Granted FR2272549A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7417652A FR2272549A1 (en) 1974-05-21 1974-05-21 Frequency coded signal receiving and decoding device - has channels with fixed frequency and converting circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7417652A FR2272549A1 (en) 1974-05-21 1974-05-21 Frequency coded signal receiving and decoding device - has channels with fixed frequency and converting circuits

Publications (2)

Publication Number Publication Date
FR2272549A1 FR2272549A1 (en) 1975-12-19
FR2272549B1 true FR2272549B1 (da) 1978-12-01

Family

ID=9139117

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7417652A Granted FR2272549A1 (en) 1974-05-21 1974-05-21 Frequency coded signal receiving and decoding device - has channels with fixed frequency and converting circuits

Country Status (1)

Country Link
FR (1) FR2272549A1 (da)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY107298A (en) * 1989-09-18 1995-10-31 Univ Sydney Technology Random access multiple user communication system.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL263599A (da) * 1960-04-13
US3428757A (en) * 1965-12-27 1969-02-18 Bell Telephone Labor Inc Multifrequency inband telephone signaling systems
CH493976A (de) * 1968-05-06 1970-07-15 Siemens Ag Verfahren zur parallelen arrhythmischen Übertragung von Zeichen, welche binär codiert werden, im Fernsprechwählnetz ohne Taktkanal
US3555435A (en) * 1968-11-21 1971-01-12 Robert E Vosteen Multifrequency signal detector
US3743945A (en) * 1970-12-23 1973-07-03 Itt Limiter for multi frequency voice receiver

Also Published As

Publication number Publication date
FR2272549A1 (en) 1975-12-19

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Legal Events

Date Code Title Description
ST Notification of lapse