NL68564C - - Google Patents

Info

Publication number
NL68564C
NL68564C NL68564DA NL68564C NL 68564 C NL68564 C NL 68564C NL 68564D A NL68564D A NL 68564DA NL 68564 C NL68564 C NL 68564C
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 NL68564C publication Critical patent/NL68564C/xx
Priority claimed from US754759A external-priority patent/US2567148A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • 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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Noise Elimination (AREA)
NL68564D 1946-10-02 NL68564C (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL282890X 1946-10-02
US754759A US2567148A (en) 1946-06-15 1947-06-14 Telephone signaling device
US2447A US2620398A (en) 1946-10-02 1948-01-15 Voice frequency signaling system for telephone systems

Publications (1)

Publication Number Publication Date
NL68564C true NL68564C (fr)

Family

ID=32303329

Family Applications (1)

Application Number Title Priority Date Filing Date
NL68564D NL68564C (fr) 1946-10-02

Country Status (6)

Country Link
US (1) US2620398A (fr)
BE (1) BE483454A (fr)
CH (1) CH282890A (fr)
FR (1) FR958116A (fr)
GB (1) GB648849A (fr)
NL (1) NL68564C (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5438618A (en) * 1993-11-15 1995-08-01 Mytech Systems Corporation Vocal frequency suppression apparatus and method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1711651A (en) * 1927-01-29 1929-05-07 Bell Telephone Labor Inc Signaling system
US1709554A (en) * 1927-07-20 1929-04-16 Bell Telephone Labor Inc Voice-frequency calling system
US2117721A (en) * 1935-09-06 1938-05-17 Siemens Ag Telephone system
US2138613A (en) * 1937-05-14 1938-11-29 Bell Telephone Labor Inc Signaling system
US2299821A (en) * 1940-04-05 1942-10-27 Bell Telephone Labor Inc Signaling system
US2410149A (en) * 1944-02-17 1946-10-29 Jr Robert A Clark Signaling system

Also Published As

Publication number Publication date
GB648849A (en) 1951-01-10
BE483454A (fr)
FR958116A (fr) 1950-03-03
CH282890A (fr) 1952-05-15
US2620398A (en) 1952-12-02

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