HU196541B - 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 Download PDF

Info

Publication number
HU196541B
HU196541B HU305987A HU305987A HU196541B HU 196541 B HU196541 B HU 196541B HU 305987 A HU305987 A HU 305987A HU 305987 A HU305987 A HU 305987A HU 196541 B HU196541 B HU 196541B
Authority
HU
Hungary
Prior art keywords
mfc
frequency
frequencies
speech
calling
Prior art date
Application number
HU305987A
Other languages
German (de)
English (en)
Hungarian (hu)
Other versions
HUT44882A (en
Inventor
Peter Lenz
Johannes Schuchart
Original Assignee
Leipzig Rft 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 filed Critical Leipzig Rft Nachrichtenelekt
Publication of HUT44882A publication Critical patent/HUT44882A/hu
Publication of HU196541B publication Critical patent/HU196541B/hu

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 (de) 1986-07-07 1986-07-07 Verfahren und anordnung zum sprachschutz in mfc-tastwahlempfaengern

Publications (2)

Publication Number Publication Date
HUT44882A HUT44882A (en) 1988-04-28
HU196541B true 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 (cs)
CS (1) CS471987A1 (cs)
DD (1) DD259987A3 (cs)
DE (1) DE3717937A1 (cs)
HU (1) HU196541B (cs)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2141502B1 (cs) * 1971-06-01 1973-06-29 Ibm France
DE2517024C3 (de) * 1975-04-17 1978-03-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung für einen Signalempfänger zum Sperren von Signalen, deren Pegel schwankt
DE2712831B2 (de) * 1977-03-23 1980-01-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Sprachgeschützter frequenzselektiver Zeichenempfänger
DE2712847C3 (de) * 1977-03-23 1979-12-06 Siemens Ag, 1000 Berlin Und 8000 Muenchen Sprachgeschützter frequenzselektiver Zeichenempfänger
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.

Also Published As

Publication number Publication date
DE3717937C2 (cs) 1989-08-10
HUT44882A (en) 1988-04-28
CS471987A1 (en) 1989-09-12
DD259987A3 (de) 1988-09-14
DE3717937A1 (de) 1988-01-28
BG49039A1 (en) 1991-07-15

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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