BE788813A - FREQUENCY SELECTIVE SIGNAL RECEIVER AND PROTECTED AGAINST VOICE SIGNALS FOR TELECOMMUNICATION INSTALLATIONS, ESPECIALLY TELEPHONY INSTALLATIONS - Google Patents

FREQUENCY SELECTIVE SIGNAL RECEIVER AND PROTECTED AGAINST VOICE SIGNALS FOR TELECOMMUNICATION INSTALLATIONS, ESPECIALLY TELEPHONY INSTALLATIONS

Info

Publication number
BE788813A
BE788813A BE788813DA BE788813A BE 788813 A BE788813 A BE 788813A BE 788813D A BE788813D A BE 788813DA BE 788813 A BE788813 A BE 788813A
Authority
BE
Belgium
Prior art keywords
installations
signal receiver
protected against
voice signals
frequency selective
Prior art date
Application number
Other languages
French (fr)
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.)
Publication date
Priority claimed from DE19712145886 external-priority patent/DE2145886C2/en
Priority claimed from DE19712156123 external-priority patent/DE2156123C2/en
Publication of BE788813A publication Critical patent/BE788813A/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
    • H04Q1/45—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)
BE788813D 1971-09-14 FREQUENCY SELECTIVE SIGNAL RECEIVER AND PROTECTED AGAINST VOICE SIGNALS FOR TELECOMMUNICATION INSTALLATIONS, ESPECIALLY TELEPHONY INSTALLATIONS BE788813A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712145886 DE2145886C2 (en) 1971-09-14 1971-09-14 Voice-protected, frequency-selective signal receiver for telecommunications, in particular telephone systems
DE19712156123 DE2156123C2 (en) 1971-11-11 1971-11-11 Frequency-selective character receiver for telecommunications, in particular telephone systems

Publications (1)

Publication Number Publication Date
BE788813A true BE788813A (en) 1973-03-14

Family

ID=25761724

Family Applications (1)

Application Number Title Priority Date Filing Date
BE788813D BE788813A (en) 1971-09-14 FREQUENCY SELECTIVE SIGNAL RECEIVER AND PROTECTED AGAINST VOICE SIGNALS FOR TELECOMMUNICATION INSTALLATIONS, ESPECIALLY TELEPHONY INSTALLATIONS

Country Status (9)

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

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
SE397461B (en) 1977-10-31
LU66057A1 (en) 1973-01-17
AT328516B (en) 1976-03-25
ATA713372A (en) 1975-06-15
NL7212486A (en) 1973-03-16
CH545569A (en) 1974-01-31
FR2153943A5 (en) 1973-05-04
IT967367B (en) 1974-02-28
GB1402119A (en) 1975-08-06

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