BE621906A - - Google Patents

Info

Publication number
BE621906A
BE621906A BE621906DA BE621906A BE 621906 A BE621906 A BE 621906A BE 621906D A BE621906D A BE 621906DA BE 621906 A BE621906 A BE 621906A
Authority
BE
Belgium
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 BE621906A publication Critical patent/BE621906A/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
    • 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
BE621906D 1961-08-30 BE621906A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST18261A DE1141348B (en) 1961-08-30 1961-08-30 Receiving device for an audio frequency code signal method with several signal frequency groups in telephone exchanges

Publications (1)

Publication Number Publication Date
BE621906A true BE621906A (en)

Family

ID=7457785

Family Applications (1)

Application Number Title Priority Date Filing Date
BE621906D BE621906A (en) 1961-08-30

Country Status (4)

Country Link
BE (1) BE621906A (en)
CH (1) CH402965A (en)
DE (1) DE1141348B (en)
NL (2) NL143398B (en)

Also Published As

Publication number Publication date
NL143398B (en) 1974-09-16
DE1141348B (en) 1962-12-20
NL282657A (en)
CH402965A (en) 1965-11-30

Similar Documents

Publication Publication Date Title
AT224007B (en)
BE164003A (en)
BE396226A (en)
BE458606A (en)
BE464928A (en)
BE469342A (en)
BE472265A (en)
BE475425A (en)
BE475477A (en)
BE476407A (en)
BE478349A (en)
BE482264A (en)
BE493336A (en)
BE567723A (en)
BE568568A (en)
BE583834A (en)
BE587184A (en)
BE596839A (en)
BE597352A (en)
BE597570A (en)
BE598861A (en)
BE599016A (en)
BE599210A (en)
BE599528A (en)
BE599922A (en)