AT273244B - Speech-protected, frequency-selective signal receiver for telecommunications, especially telephone systems - Google Patents

Speech-protected, frequency-selective signal receiver for telecommunications, especially telephone systems

Info

Publication number
AT273244B
AT273244B AT113168A AT113168A AT273244B AT 273244 B AT273244 B AT 273244B AT 113168 A AT113168 A AT 113168A AT 113168 A AT113168 A AT 113168A AT 273244 B AT273244 B AT 273244B
Authority
AT
Austria
Prior art keywords
telecommunications
speech
protected
frequency
signal receiver
Prior art date
Application number
AT113168A
Other languages
German (de)
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
Application filed by Siemens Ag filed Critical Siemens Ag
Priority to AT113168A priority Critical patent/AT273244B/en
Priority to DE19681804267 priority patent/DE1804267C2/en
Application granted granted Critical
Publication of AT273244B publication Critical patent/AT273244B/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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Telephonic Communication Services (AREA)
AT113168A 1968-02-06 1968-02-06 Speech-protected, frequency-selective signal receiver for telecommunications, especially telephone systems AT273244B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT113168A AT273244B (en) 1968-02-06 1968-02-06 Speech-protected, frequency-selective signal receiver for telecommunications, especially telephone systems
DE19681804267 DE1804267C2 (en) 1968-02-06 1968-10-21 Voice-protected, frequency-selective signal receiver for telecommunication systems, especially telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT113168A AT273244B (en) 1968-02-06 1968-02-06 Speech-protected, frequency-selective signal receiver for telecommunications, especially telephone systems

Publications (1)

Publication Number Publication Date
AT273244B true AT273244B (en) 1969-08-11

Family

ID=3507262

Family Applications (1)

Application Number Title Priority Date Filing Date
AT113168A AT273244B (en) 1968-02-06 1968-02-06 Speech-protected, frequency-selective signal receiver for telecommunications, especially telephone systems

Country Status (2)

Country Link
AT (1) AT273244B (en)
DE (1) DE1804267C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2432455C2 (en) * 1974-07-06 1982-02-18 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Evaluator for speech-protected, frequency-selective character receivers
DE2538293A1 (en) * 1975-08-28 1977-03-03 Standard Elektrik Lorenz Ag Holding circuit for telephone exchange - has AC signalling receiver detecting hold signal and opening voice line
US4061885A (en) * 1975-12-17 1977-12-06 Motorola, Inc. Digital tone decoder
DE3115151A1 (en) * 1981-04-15 1982-11-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Circuit arrangement for evaluating AC signals formed from a plurality of simultaneously transmitted alternating currents with different signal frequencies, in telecommunications systems

Also Published As

Publication number Publication date
DE1804267B1 (en) 1969-09-25
DE1804267C2 (en) 1970-05-21

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