CH545569A - - Google Patents

Info

Publication number
CH545569A
CH545569A CH545569DA CH545569A CH 545569 A CH545569 A CH 545569A CH 545569D A CH545569D A CH 545569DA CH 545569 A CH545569 A CH 545569A
Authority
CH
Switzerland
Application number
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 CH545569A publication Critical patent/CH545569A/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)
CH545569D 1971-09-14 1972-08-21 CH545569A (enrdf_load_stackoverflow)

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
CH545569A true CH545569A (enrdf_load_stackoverflow) 1974-01-31

Family

ID=25761724

Family Applications (1)

Application Number Title Priority Date Filing Date
CH545569D CH545569A (enrdf_load_stackoverflow) 1971-09-14 1972-08-21

Country Status (9)

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

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
NL7212486A (enrdf_load_stackoverflow) 1973-03-16
LU66057A1 (enrdf_load_stackoverflow) 1973-01-17
ATA713372A (de) 1975-06-15
BE788813A (fr) 1973-03-14
FR2153943A5 (enrdf_load_stackoverflow) 1973-05-04
SE397461B (sv) 1977-10-31
IT967367B (it) 1974-02-28
AT328516B (de) 1976-03-25
GB1402119A (en) 1975-08-06

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Legal Events

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PL Patent ceased