DK141570C - Talebeskyttet,frekvensselektiv tegnmodtager til telekommunikationsanlaeg,isaer telefonanlaeg - Google Patents

Talebeskyttet,frekvensselektiv tegnmodtager til telekommunikationsanlaeg,isaer telefonanlaeg

Info

Publication number
DK141570C
DK141570C DK529173A DK529173A DK141570C DK 141570 C DK141570 C DK 141570C DK 529173 A DK529173 A DK 529173A DK 529173 A DK529173 A DK 529173A DK 141570 C DK141570 C DK 141570C
Authority
DK
Denmark
Prior art keywords
isaar
telecommunications
speech
phones
protected
Prior art date
Application number
DK529173A
Other languages
Danish (da)
English (en)
Other versions
DK141570B (da
Inventor
K-D Rother
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 DK141570B publication Critical patent/DK141570B/da
Application granted granted Critical
Publication of DK141570C publication Critical patent/DK141570C/da

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)
DK529173A 1972-09-28 1973-09-27 Talebeskyttet,frekvensselektiv tegnmodtager til telekommunikationsanlaeg,isaer telefonanlaeg DK141570C (da)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19722247575 DE2247575C3 (de) 1972-09-28 Sprachgeschützter frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen
DE2247575 1972-09-28

Publications (2)

Publication Number Publication Date
DK141570B DK141570B (da) 1980-04-21
DK141570C true DK141570C (da) 1980-10-06

Family

ID=5857625

Family Applications (1)

Application Number Title Priority Date Filing Date
DK529173A DK141570C (da) 1972-09-28 1973-09-27 Talebeskyttet,frekvensselektiv tegnmodtager til telekommunikationsanlaeg,isaer telefonanlaeg

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
FR2201599A1 (fr) 1974-04-26
DK141570B (da) 1980-04-21
NO139195B (no) 1978-10-09
IT993394B (it) 1975-09-30
DE2247575A1 (de) 1974-04-18
JPS5340287B2 (fr) 1978-10-26
BE805472A (fr) 1974-03-28
AR198437A1 (es) 1974-06-21
SE395213B (sv) 1977-08-01
DE2247575B2 (de) 1975-09-04
LU68509A1 (fr) 1973-12-07
FR2201599B1 (fr) 1979-05-11
AT330252B (de) 1976-06-25
NL7313199A (fr) 1974-04-01
NO139195C (no) 1979-01-17
GB1440773A (en) 1976-06-23
ATA699873A (de) 1975-09-15
JPS4973013A (fr) 1974-07-15
CH566097A5 (fr) 1975-08-29
BR7307526D0 (pt) 1974-08-29
AU5990273A (en) 1975-03-06
US3932708A (en) 1976-01-13

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Legal Events

Date Code Title Description
PBP Patent lapsed