HUT44882A - Method and circuit arrangement for increasing call safety of push-button telephone sets of mfc system - Google Patents

Method and circuit arrangement for increasing call safety of push-button telephone sets of mfc system

Info

Publication number
HUT44882A
HUT44882A HU305987A HU305987A HUT44882A HU T44882 A HUT44882 A HU T44882A HU 305987 A HU305987 A HU 305987A HU 305987 A HU305987 A HU 305987A HU T44882 A HUT44882 A HU T44882A
Authority
HU
Hungary
Prior art keywords
push
circuit arrangement
telephone sets
button telephone
mfc system
Prior art date
Application number
HU305987A
Other languages
Hungarian (hu)
Other versions
HU196541B (en
Inventor
Peter Lenz
Johannes Schuchart
Original Assignee
Leipzig Rft Nachrichtenelekt
Albert Norden Nachrichtenelekt
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 by Leipzig Rft Nachrichtenelekt, Albert Norden Nachrichtenelekt filed Critical Leipzig Rft Nachrichtenelekt
Publication of HUT44882A publication Critical patent/HUT44882A/en
Publication of HU196541B publication Critical patent/HU196541B/en

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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
HU305987A 1986-07-07 1987-07-07 Method and circuit arrangement for increasing call safety of push-button telephone sets of mfc system HU196541B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD29222486A DD259987A3 (en) 1986-07-07 1986-07-07 METHOD AND ARRANGEMENT FOR LANGUAGE PROTECTION IN MFC-TASTWAHLMPFAENGERN

Publications (2)

Publication Number Publication Date
HUT44882A true HUT44882A (en) 1988-04-28
HU196541B HU196541B (en) 1988-11-28

Family

ID=5580693

Family Applications (1)

Application Number Title Priority Date Filing Date
HU305987A HU196541B (en) 1986-07-07 1987-07-07 Method and circuit arrangement for increasing call safety of push-button telephone sets of mfc system

Country Status (5)

Country Link
BG (1) BG49039A1 (en)
CS (1) CS471987A1 (en)
DD (1) DD259987A3 (en)
DE (1) DE3717937A1 (en)
HU (1) HU196541B (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2141502B1 (en) * 1971-06-01 1973-06-29 Ibm France
DE2517024C3 (en) * 1975-04-17 1978-03-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for a signal receiver for blocking signals whose level fluctuates
DE2712847C3 (en) * 1977-03-23 1979-12-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Speech-protected, frequency-selective character receiver
DE2712831B2 (en) * 1977-03-23 1980-01-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Speech-protected, frequency-selective character receiver
NL7903346A (en) * 1979-04-27 1980-10-29 Bell Telephone Mfg DIGITAL SIGNALING SYSTEM.

Also Published As

Publication number Publication date
DD259987A3 (en) 1988-09-14
CS471987A1 (en) 1989-09-12
DE3717937A1 (en) 1988-01-28
BG49039A1 (en) 1991-07-15
HU196541B (en) 1988-11-28
DE3717937C2 (en) 1989-08-10

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Legal Events

Date Code Title Description
HU90 Patent valid on 900628
HMM4 Cancellation of final prot. due to non-payment of fee