ES172956A1 - IMPROVEMENTS IN VOCAL FREQUENCY CALLING DEVICES - Google Patents

IMPROVEMENTS IN VOCAL FREQUENCY CALLING DEVICES

Info

Publication number
ES172956A1
ES172956A1 ES172956A ES172956A ES172956A1 ES 172956 A1 ES172956 A1 ES 172956A1 ES 172956 A ES172956 A ES 172956A ES 172956 A ES172956 A ES 172956A ES 172956 A1 ES172956 A1 ES 172956A1
Authority
ES
Spain
Prior art keywords
calling devices
vocal frequency
frequency calling
vocal
devices
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
ES172956A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
Standard Electrica SA
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 Alcatel Espana SA, Standard Electrica SA filed Critical Alcatel Espana SA
Publication of ES172956A1 publication Critical patent/ES172956A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals
    • 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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Telephonic Communication Services (AREA)
ES172956A 1945-02-21 1946-03-20 IMPROVEMENTS IN VOCAL FREQUENCY CALLING DEVICES Expired ES172956A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US579126A US2414440A (en) 1945-02-21 1945-02-21 Voice frequency ringer

Publications (1)

Publication Number Publication Date
ES172956A1 true ES172956A1 (en) 1946-05-01

Family

ID=24315671

Family Applications (1)

Application Number Title Priority Date Filing Date
ES172956A Expired ES172956A1 (en) 1945-02-21 1946-03-20 IMPROVEMENTS IN VOCAL FREQUENCY CALLING DEVICES

Country Status (5)

Country Link
US (1) US2414440A (en)
BE (1) BE467777A (en)
ES (1) ES172956A1 (en)
FR (1) FR922528A (en)
GB (1) GB608117A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR960967A (en) * 1945-02-06 1950-04-28
US2751436A (en) * 1952-03-27 1956-06-19 Automatic Elect Lab Carrier current telephone systems
DE1004860B (en) * 1952-12-18 1957-03-21 Roland Laraque Internal combustion engine with opposing pistons
FR1098648A (en) * 1954-01-22 1955-08-16 Lignes Telegraph Telephon Telegraph signal reception device

Also Published As

Publication number Publication date
US2414440A (en) 1947-01-21
BE467777A (en)
FR922528A (en) 1947-06-11
GB608117A (en) 1948-09-09

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