FR2241075B1 - - Google Patents

Info

Publication number
FR2241075B1
FR2241075B1 FR7426542A FR7426542A FR2241075B1 FR 2241075 B1 FR2241075 B1 FR 2241075B1 FR 7426542 A FR7426542 A FR 7426542A FR 7426542 A FR7426542 A FR 7426542A FR 2241075 B1 FR2241075 B1 FR 2241075B1
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
FR7426542A
Other versions
FR2241075A1 (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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of FR2241075A1 publication Critical patent/FR2241075A1/fr
Application granted granted Critical
Publication of FR2241075B1 publication Critical patent/FR2241075B1/fr
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
FR7426542A 1973-08-16 1974-07-31 Expired FR2241075B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732341225 DE2341225B2 (de) 1973-08-16 1973-08-16 Selektiver zeichenempfaenger fuer fernmelde-, insbesondere fernsprechanlagen

Publications (2)

Publication Number Publication Date
FR2241075A1 FR2241075A1 (fr) 1975-03-14
FR2241075B1 true FR2241075B1 (fr) 1978-02-17

Family

ID=5889793

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7426542A Expired FR2241075B1 (fr) 1973-08-16 1974-07-31

Country Status (14)

Country Link
US (1) US3935395A (fr)
BE (1) BE818725A (fr)
BR (1) BR7406644D0 (fr)
CH (1) CH586986A5 (fr)
DE (1) DE2341225B2 (fr)
DK (1) DK432374A (fr)
ES (1) ES429267A1 (fr)
FR (1) FR2241075B1 (fr)
GB (1) GB1460996A (fr)
HK (1) HK44177A (fr)
NL (1) NL7410653A (fr)
NO (1) NO742913L (fr)
SE (1) SE7410344L (fr)
ZA (1) ZA744858B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2540859C2 (de) * 1975-09-13 1984-01-12 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung für einen selektiven Zeichenempfänger, insbesondere für Fernsprechanlagen
US4021620A (en) * 1975-12-04 1977-05-03 Rca Corporation Multifrequency signal receiver with digital tone receiver
US4061885A (en) * 1975-12-17 1977-12-06 Motorola, Inc. Digital tone decoder
US4158110A (en) * 1977-08-25 1979-06-12 Tone Commander Systems, Inc. Tone selective key telephone intercom system including digital tone detector
IT1097753B (it) * 1978-07-28 1985-08-31 Chimosa Chimica Organica Spa Compcsti piperidinici, processo per la loro preparazione e loro impiego come stabil izzanti per polimeri sintetici
FR2485843B1 (fr) * 1980-06-25 1986-11-07 Cit Alcatel Recepteur numerique de frequences
DE3115151A1 (de) * 1981-04-15 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur auswertung von aus mehreren gleichzeitig uebertragenen wechselstroemen unterschiedlicher signalfrequenzen gebildeten wechselstromsignalen, in fernmeldeanlagen
US4675898A (en) * 1984-12-07 1987-06-23 Buscom Systems, Inc. Single tone telephone receiver
US5610978A (en) * 1994-12-30 1997-03-11 Mitel Corporation Ring discriminator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3537001A (en) * 1968-12-05 1970-10-27 Bell Telephone Labor Inc Multifrequency tone detector
US3760269A (en) * 1972-07-31 1973-09-18 Gte Automatic Electric Lab Inc Multi-frequency tone detector
US3790720A (en) * 1972-10-27 1974-02-05 Northern Electric Co Digital decoder for multiple frequency telephone signalling

Also Published As

Publication number Publication date
NL7410653A (nl) 1975-02-18
DE2341225A1 (de) 1975-02-20
ES429267A1 (es) 1976-08-16
DE2341225B2 (de) 1976-10-28
SE7410344L (fr) 1975-02-17
HK44177A (en) 1977-09-09
BR7406644D0 (pt) 1975-09-09
FR2241075A1 (fr) 1975-03-14
DK432374A (fr) 1975-04-28
ZA744858B (en) 1975-08-27
US3935395A (en) 1976-01-27
NO742913L (fr) 1975-03-17
BE818725A (nl) 1975-02-12
CH586986A5 (fr) 1977-04-15
GB1460996A (en) 1977-01-06

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Legal Events

Date Code Title Description
ST Notification of lapse