NL7212486A - - Google Patents

Info

Publication number
NL7212486A
NL7212486A NL7212486A NL7212486A NL7212486A NL 7212486 A NL7212486 A NL 7212486A NL 7212486 A NL7212486 A NL 7212486A NL 7212486 A NL7212486 A NL 7212486A NL 7212486 A NL7212486 A NL 7212486A
Authority
NL
Netherlands
Application number
NL7212486A
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 DE19712145886 external-priority patent/DE2145886C2/de
Priority claimed from DE19712156123 external-priority patent/DE2156123C2/de
Application filed filed Critical
Publication of NL7212486A publication Critical patent/NL7212486A/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
    • H04Q1/457—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Mobile Radio Communication Systems (AREA)
NL7212486A 1971-09-14 1972-09-14 NL7212486A (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712145886 DE2145886C2 (de) 1971-09-14 1971-09-14 Sprachgeschützter frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen
DE19712156123 DE2156123C2 (de) 1971-11-11 1971-11-11 Frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen

Publications (1)

Publication Number Publication Date
NL7212486A true NL7212486A (de) 1973-03-16

Family

ID=25761724

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7212486A NL7212486A (de) 1971-09-14 1972-09-14

Country Status (9)

Country Link
AT (1) AT328516B (de)
BE (1) BE788813A (de)
CH (1) CH545569A (de)
FR (1) FR2153943A5 (de)
GB (1) GB1402119A (de)
IT (1) IT967367B (de)
LU (1) LU66057A1 (de)
NL (1) NL7212486A (de)
SE (1) SE397461B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216463A (en) * 1978-08-10 1980-08-05 Motorola, Inc. Programmable digital tone detector

Also Published As

Publication number Publication date
FR2153943A5 (de) 1973-05-04
IT967367B (it) 1974-02-28
AT328516B (de) 1976-03-25
GB1402119A (en) 1975-08-06
CH545569A (de) 1974-01-31
LU66057A1 (de) 1973-01-17
BE788813A (fr) 1973-03-14
ATA713372A (de) 1975-06-15
SE397461B (sv) 1977-10-31

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Legal Events

Date Code Title Description
BX A request for additional search has been filed
BY An additional search report has been drawn up
BC A request for examination has been filed
BV The patent application has lapsed