FR2201599B1 - - Google Patents

Info

Publication number
FR2201599B1
FR2201599B1 FR7334491A FR7334491A FR2201599B1 FR 2201599 B1 FR2201599 B1 FR 2201599B1 FR 7334491 A FR7334491 A FR 7334491A FR 7334491 A FR7334491 A FR 7334491A FR 2201599 B1 FR2201599 B1 FR 2201599B1
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
FR7334491A
Other versions
FR2201599A1 (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.)
Siemens AG
Original Assignee
Siemens 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
Priority claimed from DE19722247575 external-priority patent/DE2247575C3/de
Application filed by Siemens AG filed Critical Siemens AG
Publication of FR2201599A1 publication Critical patent/FR2201599A1/fr
Application granted granted Critical
Publication of FR2201599B1 publication Critical patent/FR2201599B1/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)
  • Noise Elimination (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Circuits Of Receivers In General (AREA)
  • Telephone Function (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Telephonic Communication Services (AREA)
FR7334491A 1972-09-28 1973-09-26 Expired FR2201599B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722247575 DE2247575C3 (de) 1972-09-28 Sprachgeschützter frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen

Publications (2)

Publication Number Publication Date
FR2201599A1 FR2201599A1 (fr) 1974-04-26
FR2201599B1 true FR2201599B1 (fr) 1979-05-11

Family

ID=5857625

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7334491A Expired FR2201599B1 (fr) 1972-09-28 1973-09-26

Country Status (15)

Country Link
US (1) US3932708A (fr)
JP (1) JPS5340287B2 (fr)
AR (1) AR198437A1 (fr)
AT (1) AT330252B (fr)
BE (1) BE805472A (fr)
BR (1) BR7307526D0 (fr)
CH (1) CH566097A5 (fr)
DK (1) DK141570C (fr)
FR (1) FR2201599B1 (fr)
GB (1) GB1440773A (fr)
IT (1) IT993394B (fr)
LU (1) LU68509A1 (fr)
NL (1) NL7313199A (fr)
NO (1) NO139195C (fr)
SE (1) SE395213B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157918B (en) * 1984-04-09 1987-12-02 Ricoh Kk Call signal detecting device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL267564A (fr) * 1960-08-22
FR1511133A (fr) * 1966-12-16 1968-01-26 Ass Ouvriers Instr Precision Procédé d'identification de chacune des fréquences d'un groupe de plusieurs fréquences déterminées et appareil récepteur pour la mise en oeuvre de ce procédé
US3537001A (en) * 1968-12-05 1970-10-27 Bell Telephone Labor Inc Multifrequency tone detector
US3582565A (en) * 1969-01-13 1971-06-01 Automatic Elect Lab Tone channels for multifrequency receivers
US3582562A (en) * 1969-05-07 1971-06-01 Itt Key telephone intercommunication system
FR2141502B1 (fr) * 1971-06-01 1973-06-29 Ibm France
US3812432A (en) * 1973-01-05 1974-05-21 Bell Telephone Labor Inc Tone detector

Also Published As

Publication number Publication date
AR198437A1 (es) 1974-06-21
BR7307526D0 (pt) 1974-08-29
NL7313199A (fr) 1974-04-01
NO139195B (no) 1978-10-09
SE395213B (sv) 1977-08-01
LU68509A1 (fr) 1973-12-07
DE2247575A1 (de) 1974-04-18
CH566097A5 (fr) 1975-08-29
JPS4973013A (fr) 1974-07-15
DK141570C (da) 1980-10-06
GB1440773A (en) 1976-06-23
BE805472A (fr) 1974-03-28
NO139195C (no) 1979-01-17
US3932708A (en) 1976-01-13
DE2247575B2 (de) 1975-09-04
DK141570B (da) 1980-04-21
JPS5340287B2 (fr) 1978-10-26
FR2201599A1 (fr) 1974-04-26
IT993394B (it) 1975-09-30
ATA699873A (de) 1975-09-15
AU5990273A (en) 1975-03-06
AT330252B (de) 1976-06-25

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Legal Events

Date Code Title Description
ST Notification of lapse