AT330252B - Sprachgeschutzer frequenzselektiver zeichenempfanger fur fernmelde-, insbesondere fernsprechanlagen - Google Patents

Sprachgeschutzer frequenzselektiver zeichenempfanger fur fernmelde-, insbesondere fernsprechanlagen

Info

Publication number
AT330252B
AT330252B AT699873A AT699873A AT330252B AT 330252 B AT330252 B AT 330252B AT 699873 A AT699873 A AT 699873A AT 699873 A AT699873 A AT 699873A AT 330252 B AT330252 B AT 330252B
Authority
AT
Austria
Prior art keywords
remote communication
telephone systems
particular telephone
protection frequency
sign receiver
Prior art date
Application number
AT699873A
Other languages
English (en)
Other versions
ATA699873A (de
Original Assignee
Siemens Ag
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
Priority claimed from DE19722247575 external-priority patent/DE2247575C3/de
Application filed by Siemens Ag filed Critical Siemens Ag
Publication of ATA699873A publication Critical patent/ATA699873A/de
Application granted granted Critical
Publication of AT330252B publication Critical patent/AT330252B/de

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
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
AT699873A 1972-09-28 1973-08-09 Sprachgeschutzer frequenzselektiver zeichenempfanger fur fernmelde-, insbesondere fernsprechanlagen AT330252B (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722247575 DE2247575C3 (de) 1972-09-28 Sprachgeschützter frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen

Publications (2)

Publication Number Publication Date
ATA699873A ATA699873A (de) 1975-09-15
AT330252B true AT330252B (de) 1976-06-25

Family

ID=5857625

Family Applications (1)

Application Number Title Priority Date Filing Date
AT699873A AT330252B (de) 1972-09-28 1973-08-09 Sprachgeschutzer frequenzselektiver zeichenempfanger fur fernmelde-, insbesondere fernsprechanlagen

Country Status (15)

Country Link
US (1) US3932708A (de)
JP (1) JPS5340287B2 (de)
AR (1) AR198437A1 (de)
AT (1) AT330252B (de)
BE (1) BE805472A (de)
BR (1) BR7307526D0 (de)
CH (1) CH566097A5 (de)
DK (1) DK141570C (de)
FR (1) FR2201599B1 (de)
GB (1) GB1440773A (de)
IT (1) IT993394B (de)
LU (1) LU68509A1 (de)
NL (1) NL7313199A (de)
NO (1) NO139195C (de)
SE (1) SE395213B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157918B (en) * 1984-04-09 1987-12-02 Ricoh Kk Call signal detecting device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL267564A (de) * 1960-08-22
FR1511133A (fr) * 1966-12-16 1968-01-26 Ass Ouvriers Instr Precision Procédé d'identification de chacune des fréquences d'un groupe de plusieurs fréquences déterminées et appareil récepteur pour la mise en oeuvre de ce procédé
US3537001A (en) * 1968-12-05 1970-10-27 Bell Telephone Labor Inc Multifrequency tone detector
US3582565A (en) * 1969-01-13 1971-06-01 Automatic Elect Lab Tone channels for multifrequency receivers
US3582562A (en) * 1969-05-07 1971-06-01 Itt Key telephone intercommunication system
FR2141502B1 (de) * 1971-06-01 1973-06-29 Ibm France
US3812432A (en) * 1973-01-05 1974-05-21 Bell Telephone Labor Inc Tone detector

Also Published As

Publication number Publication date
DE2247575A1 (de) 1974-04-18
FR2201599B1 (de) 1979-05-11
AU5990273A (en) 1975-03-06
NL7313199A (de) 1974-04-01
NO139195C (no) 1979-01-17
JPS4973013A (de) 1974-07-15
CH566097A5 (de) 1975-08-29
LU68509A1 (de) 1973-12-07
GB1440773A (en) 1976-06-23
DK141570B (da) 1980-04-21
DK141570C (da) 1980-10-06
AR198437A1 (es) 1974-06-21
JPS5340287B2 (de) 1978-10-26
IT993394B (it) 1975-09-30
FR2201599A1 (de) 1974-04-26
US3932708A (en) 1976-01-13
ATA699873A (de) 1975-09-15
BR7307526D0 (pt) 1974-08-29
NO139195B (no) 1978-10-09
BE805472A (fr) 1974-03-28
SE395213B (sv) 1977-08-01
DE2247575B2 (de) 1975-09-04

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Legal Events

Date Code Title Description
ELJ Ceased due to non-payment of the annual fee