AT328516B - CIRCUIT ARRANGEMENT FOR VOICE PROTECTED FREQUENCY SELECTIVE SIGN RECEIVERS IN TELEPHONE, IN PARTICULAR TELEPHONE SYSTEMS - Google Patents

CIRCUIT ARRANGEMENT FOR VOICE PROTECTED FREQUENCY SELECTIVE SIGN RECEIVERS IN TELEPHONE, IN PARTICULAR TELEPHONE SYSTEMS

Info

Publication number
AT328516B
AT328516B AT713372A AT713372A AT328516B AT 328516 B AT328516 B AT 328516B AT 713372 A AT713372 A AT 713372A AT 713372 A AT713372 A AT 713372A AT 328516 B AT328516 B AT 328516B
Authority
AT
Austria
Prior art keywords
telephone
receivers
circuit arrangement
frequency selective
protected frequency
Prior art date
Application number
AT713372A
Other languages
German (de)
Other versions
ATA713372A (en
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 DE19712145886 external-priority patent/DE2145886C2/en
Priority claimed from DE19712156123 external-priority patent/DE2156123C2/en
Application filed by Siemens Ag filed Critical Siemens Ag
Publication of ATA713372A publication Critical patent/ATA713372A/en
Application granted granted Critical
Publication of AT328516B publication Critical patent/AT328516B/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)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
AT713372A 1971-09-14 1972-08-17 CIRCUIT ARRANGEMENT FOR VOICE PROTECTED FREQUENCY SELECTIVE SIGN RECEIVERS IN TELEPHONE, IN PARTICULAR TELEPHONE SYSTEMS AT328516B (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 (2)

Publication Number Publication Date
ATA713372A ATA713372A (en) 1975-06-15
AT328516B true AT328516B (en) 1976-03-25

Family

ID=25761724

Family Applications (1)

Application Number Title Priority Date Filing Date
AT713372A AT328516B (en) 1971-09-14 1972-08-17 CIRCUIT ARRANGEMENT FOR VOICE PROTECTED FREQUENCY SELECTIVE SIGN RECEIVERS IN TELEPHONE, IN PARTICULAR TELEPHONE SYSTEMS

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
FR2153943A5 (en) 1973-05-04
CH545569A (en) 1974-01-31
SE397461B (en) 1977-10-31
NL7212486A (en) 1973-03-16
IT967367B (en) 1974-02-28
BE788813A (en) 1973-03-14
ATA713372A (en) 1975-06-15
LU66057A1 (en) 1973-01-17
GB1402119A (en) 1975-08-06

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Legal Events

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