ATA814174A - CIRCUIT ARRANGEMENT FOR A VOICE PROTECTED RECEIVING DEVICE FOR MULTI-FREQUENCY CODE SELECTION IN REMOTE COMMUNICATION DEVICES, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS - Google Patents

CIRCUIT ARRANGEMENT FOR A VOICE PROTECTED RECEIVING DEVICE FOR MULTI-FREQUENCY CODE SELECTION IN REMOTE COMMUNICATION DEVICES, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS

Info

Publication number
ATA814174A
ATA814174A AT814174A AT814174A ATA814174A AT A814174 A ATA814174 A AT A814174A AT 814174 A AT814174 A AT 814174A AT 814174 A AT814174 A AT 814174A AT A814174 A ATA814174 A AT A814174A
Authority
AT
Austria
Prior art keywords
receiving device
communication devices
circuit arrangement
remote communication
telephone switching
Prior art date
Application number
AT814174A
Other languages
German (de)
Other versions
AT338881B (en
Inventor
Johann Ing Ernstthaler
Original Assignee
Kapsch Telephon Telegraph
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
Application filed by Kapsch Telephon Telegraph filed Critical Kapsch Telephon Telegraph
Priority to AT814174A priority Critical patent/AT338881B/en
Publication of ATA814174A publication Critical patent/ATA814174A/en
Application granted granted Critical
Publication of AT338881B publication Critical patent/AT338881B/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
    • H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Noise Elimination (AREA)
AT814174A 1974-10-10 1974-10-10 CIRCUIT ARRANGEMENT FOR A VOICE PROTECTED RECEIVING DEVICE FOR MULTI-FREQUENCY CODE SELECTION IN REMOTE COMMUNICATION DEVICES, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS AT338881B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT814174A AT338881B (en) 1974-10-10 1974-10-10 CIRCUIT ARRANGEMENT FOR A VOICE PROTECTED RECEIVING DEVICE FOR MULTI-FREQUENCY CODE SELECTION IN REMOTE COMMUNICATION DEVICES, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT814174A AT338881B (en) 1974-10-10 1974-10-10 CIRCUIT ARRANGEMENT FOR A VOICE PROTECTED RECEIVING DEVICE FOR MULTI-FREQUENCY CODE SELECTION IN REMOTE COMMUNICATION DEVICES, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS

Publications (2)

Publication Number Publication Date
ATA814174A true ATA814174A (en) 1977-01-15
AT338881B AT338881B (en) 1977-09-26

Family

ID=3602941

Family Applications (1)

Application Number Title Priority Date Filing Date
AT814174A AT338881B (en) 1974-10-10 1974-10-10 CIRCUIT ARRANGEMENT FOR A VOICE PROTECTED RECEIVING DEVICE FOR MULTI-FREQUENCY CODE SELECTION IN REMOTE COMMUNICATION DEVICES, IN PARTICULAR TELEPHONE SWITCHING SYSTEMS

Country Status (1)

Country Link
AT (1) AT338881B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648661B1 (en) * 1989-06-19 1994-03-04 Alcatel Business Systems LOW FREQUENCY ALTERNATIVE SIGNAL DETECTOR IN PARTICULAR FOR TELEPHONE TRUNK

Also Published As

Publication number Publication date
AT338881B (en) 1977-09-26

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