GB710600A - Improvements in or relating to voice frequency signalling system - Google Patents

Improvements in or relating to voice frequency signalling system

Info

Publication number
GB710600A
GB710600A GB14314/52A GB1431452A GB710600A GB 710600 A GB710600 A GB 710600A GB 14314/52 A GB14314/52 A GB 14314/52A GB 1431452 A GB1431452 A GB 1431452A GB 710600 A GB710600 A GB 710600A
Authority
GB
United Kingdom
Prior art keywords
circuit
signal
frequency
valve
transformer
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
GB14314/52A
Other languages
English (en)
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB710600A publication Critical patent/GB710600A/en
Expired legal-status Critical Current

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Noise Elimination (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
GB14314/52A 1951-07-10 1952-06-06 Improvements in or relating to voice frequency signalling system Expired GB710600A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT319073X 1951-07-10

Publications (1)

Publication Number Publication Date
GB710600A true GB710600A (en) 1954-06-16

Family

ID=11234479

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14314/52A Expired GB710600A (en) 1951-07-10 1952-06-06 Improvements in or relating to voice frequency signalling system

Country Status (3)

Country Link
BE (1) BE512709A (OSRAM)
CH (1) CH319073A (OSRAM)
GB (1) GB710600A (OSRAM)

Also Published As

Publication number Publication date
CH319073A (fr) 1957-01-31
BE512709A (OSRAM)

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