NL6805157A - - Google Patents

Info

Publication number
NL6805157A
NL6805157A NL6805157A NL6805157A NL6805157A NL 6805157 A NL6805157 A NL 6805157A NL 6805157 A NL6805157 A NL 6805157A NL 6805157 A NL6805157 A NL 6805157A NL 6805157 A NL6805157 A NL 6805157A
Authority
NL
Netherlands
Application number
NL6805157A
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
Application filed filed Critical
Priority to NL6805157A priority Critical patent/NL6805157A/xx
Priority to DE19691914814 priority patent/DE1914814A1/de
Priority to US810986A priority patent/US3588374A/en
Priority to GB07896/69A priority patent/GB1268782A/en
Priority to SE04949/69A priority patent/SE332650B/xx
Priority to AT339869A priority patent/AT287069B/de
Priority to BE731266D priority patent/BE731266A/xx
Priority to FR6911068A priority patent/FR2005998A1/fr
Publication of NL6805157A publication Critical patent/NL6805157A/xx

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
    • H04Q1/453—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)
  • Amplifiers (AREA)
  • Noise Elimination (AREA)
NL6805157A 1968-04-10 1968-04-10 NL6805157A (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL6805157A NL6805157A (de) 1968-04-10 1968-04-10
DE19691914814 DE1914814A1 (de) 1968-04-10 1969-03-22 Empfaenger fuer Signalisierungssignale mit einer im Gespraechsfrequenzband liegenden Signalisierungsfrequenz
US810986A US3588374A (en) 1968-04-10 1969-03-27 Receiver for signalling signals of a frequency lying in the speech-frequency band
GB07896/69A GB1268782A (en) 1968-04-10 1969-04-08 Transmission system
SE04949/69A SE332650B (de) 1968-04-10 1969-04-08
AT339869A AT287069B (de) 1968-04-10 1969-04-08 Sprachgeschützter Empfänger für Signalisierungssignale mit einer im Gesprächsfrequenzband liegenden Signalisierungsfrequenz
BE731266D BE731266A (de) 1968-04-10 1969-04-09
FR6911068A FR2005998A1 (de) 1968-04-10 1969-04-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6805157A NL6805157A (de) 1968-04-10 1968-04-10

Publications (1)

Publication Number Publication Date
NL6805157A true NL6805157A (de) 1969-10-14

Family

ID=19803316

Family Applications (1)

Application Number Title Priority Date Filing Date
NL6805157A NL6805157A (de) 1968-04-10 1968-04-10

Country Status (8)

Country Link
US (1) US3588374A (de)
AT (1) AT287069B (de)
BE (1) BE731266A (de)
DE (1) DE1914814A1 (de)
FR (1) FR2005998A1 (de)
GB (1) GB1268782A (de)
NL (1) NL6805157A (de)
SE (1) SE332650B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2141502B1 (de) * 1971-06-01 1973-06-29 Ibm France
US4284851A (en) * 1979-06-29 1981-08-18 Bell Telephone Laboratories, Incorporated Arrangement for frustrating fraudulent telephone calls

Also Published As

Publication number Publication date
BE731266A (de) 1969-10-09
AT287069B (de) 1971-01-11
US3588374A (en) 1971-06-28
FR2005998A1 (de) 1969-12-19
SE332650B (de) 1971-02-15
GB1268782A (en) 1972-03-29
DE1914814A1 (de) 1969-11-06

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