FR2141804A1 - - Google Patents

Info

Publication number
FR2141804A1
FR2141804A1 FR7220703A FR7220703A FR2141804A1 FR 2141804 A1 FR2141804 A1 FR 2141804A1 FR 7220703 A FR7220703 A FR 7220703A FR 7220703 A FR7220703 A FR 7220703A FR 2141804 A1 FR2141804 A1 FR 2141804A1
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.)
Withdrawn
Application number
FR7220703A
Other languages
French (fr)
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.)
Hasler AG
Original Assignee
Hasler AG
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 Hasler AG filed Critical Hasler AG
Publication of FR2141804A1 publication Critical patent/FR2141804A1/fr
Withdrawn legal-status Critical Current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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
FR7220703A 1971-06-18 1972-06-08 Withdrawn FR2141804A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH881471A CH534468A (de) 1971-06-18 1971-06-18 Empfänger für Mehrfrequenzcode-Übertragungsverfahren

Publications (1)

Publication Number Publication Date
FR2141804A1 true FR2141804A1 (de) 1973-01-26

Family

ID=4345037

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7220703A Withdrawn FR2141804A1 (de) 1971-06-18 1972-06-08

Country Status (5)

Country Link
CH (1) CH534468A (de)
DE (1) DE2141867A1 (de)
FR (1) FR2141804A1 (de)
GB (1) GB1349818A (de)
IT (1) IT959148B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7600960A (nl) * 1975-01-31 1976-08-03 Telecommunications Sa Werkwijze voor het detecteren van bepaalde frequen- tiecomponenten in signalen, die het gevolg zijn van de multiplexering van numerieke kanalen, alsmede numerieke multifrequentie-ontvanger voor het uit- voeren van deze werkwijze.
EP0300265A2 (de) * 1987-07-24 1989-01-25 Advanced Micro Devices, Inc. Verfahren für digitale Ton-Erkennung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7600960A (nl) * 1975-01-31 1976-08-03 Telecommunications Sa Werkwijze voor het detecteren van bepaalde frequen- tiecomponenten in signalen, die het gevolg zijn van de multiplexering van numerieke kanalen, alsmede numerieke multifrequentie-ontvanger voor het uit- voeren van deze werkwijze.
EP0300265A2 (de) * 1987-07-24 1989-01-25 Advanced Micro Devices, Inc. Verfahren für digitale Ton-Erkennung
EP0300265A3 (en) * 1987-07-24 1990-10-24 Advanced Micro Devices, Inc. Digital tone detection and generation

Also Published As

Publication number Publication date
CH534468A (de) 1973-02-28
GB1349818A (en) 1974-04-10
DE2141867A1 (de) 1972-12-21
IT959148B (it) 1973-11-10

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Legal Events

Date Code Title Description
ST Notification of lapse