NL75784C - - Google Patents

Info

Publication number
NL75784C
NL75784C NL75784DA NL75784C NL 75784 C NL75784 C NL 75784C NL 75784D A NL75784D A NL 75784DA NL 75784 C NL75784 C NL 75784C
Authority
NL
Netherlands
Application number
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.)
Publication of NL75784C publication Critical patent/NL75784C/xx

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q1/00Details of selecting apparatus or arrangements
    • H04Q1/18Electrical details
    • H04Q1/30Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Noise Elimination (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
NL75784D 1947-07-09 NL75784C (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18161/47A GB651464A (en) 1947-07-09 1947-07-09 Improvements in or relating to voice frequency signalling receivers

Publications (1)

Publication Number Publication Date
NL75784C true NL75784C (fr)

Family

ID=10107688

Family Applications (1)

Application Number Title Priority Date Filing Date
NL75784D NL75784C (fr) 1947-07-09

Country Status (6)

Country Link
US (1) US2572074A (fr)
BE (1) BE486300A (fr)
CH (1) CH268995A (fr)
FR (1) FR980088A (fr)
GB (1) GB651464A (fr)
NL (1) NL75784C (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2677014A (en) * 1950-06-29 1954-04-27 Westinghouse Electric Corp Tone-shift carrier
US2817828A (en) * 1953-10-07 1957-12-24 Bell Telephone Labor Inc Multifrequency high speed signaling system employing pulses of signaling currents ofpredetermined duration based on orthogonal functions
US2913711A (en) * 1954-10-15 1959-11-17 Itt Signal control system
US2779935A (en) * 1955-03-21 1957-01-29 Holmes Electric Protective Com Noise actuated disabling unit
US3124658A (en) * 1958-02-28 1964-03-10 Input
US3204045A (en) * 1962-10-30 1965-08-31 Collins Radio Co Automatic ring thru system
FR2506544A1 (fr) * 1981-05-19 1982-11-26 Jeumont Schneider Procede de determination de l'etat d'un signal alternatif module en tout ou rien en milieu perturbe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE431048A (fr) * 1937-11-12
US2255190A (en) * 1939-02-18 1941-09-09 Ryall Leonard Ernest Variable amplifying device
US2282131A (en) * 1940-01-12 1942-05-05 Associated Electric Lab Inc Electrical signaling system

Also Published As

Publication number Publication date
US2572074A (en) 1951-10-23
CH268995A (de) 1950-06-15
BE486300A (fr)
FR980088A (fr) 1951-05-08
GB651464A (en) 1951-04-04

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