GB641431A - Improvements in or relating to voice and like signal operated circuit arrangements and devices - Google Patents

Improvements in or relating to voice and like signal operated circuit arrangements and devices

Info

Publication number
GB641431A
GB641431A GB1044647A GB1044647A GB641431A GB 641431 A GB641431 A GB 641431A GB 1044647 A GB1044647 A GB 1044647A GB 1044647 A GB1044647 A GB 1044647A GB 641431 A GB641431 A GB 641431A
Authority
GB
United Kingdom
Prior art keywords
voice
signal operated
relating
devices
circuit arrangements
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
GB1044647A
Inventor
Harold Jefferson
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 to FR964882D priority Critical patent/FR964882A/fr
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB1044647A priority patent/GB641431A/en
Publication of GB641431A publication Critical patent/GB641431A/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
    • H04Q1/446—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)
  • Circuits Of Receivers In General (AREA)

Abstract

641,431. Voice frequency receivers. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 18, 1947, No. 10446. [Class 40 (iv)] [Also in Groups XL (b) and XL (c)] A band-pass filter having an irregular output characteristic between its limiting frequencies and a non-rectilinear phase characteristic inserted in the path of a voice or like signal operated device effects a redistribution of energy in the pass band, reducing the ratio of peak amplitude to mean level of received noise and in consequence reducing the liability to false operation. Filters comprising a number of parallel tuned circuits in series or a number of series tuned circuits in parallel having the above characteristics are shown incorporated in valve circuits, Figs.2 and 3.
GB1044647A 1947-04-18 1947-04-18 Improvements in or relating to voice and like signal operated circuit arrangements and devices Expired GB641431A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR964882D FR964882A (en) 1947-04-18
GB1044647A GB641431A (en) 1947-04-18 1947-04-18 Improvements in or relating to voice and like signal operated circuit arrangements and devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1044647A GB641431A (en) 1947-04-18 1947-04-18 Improvements in or relating to voice and like signal operated circuit arrangements and devices

Publications (1)

Publication Number Publication Date
GB641431A true GB641431A (en) 1950-08-09

Family

ID=9968006

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1044647A Expired GB641431A (en) 1947-04-18 1947-04-18 Improvements in or relating to voice and like signal operated circuit arrangements and devices

Country Status (2)

Country Link
FR (1) FR964882A (en)
GB (1) GB641431A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932027A (en) * 1955-03-09 1960-04-05 Smith Corp A O Antenna

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932027A (en) * 1955-03-09 1960-04-05 Smith Corp A O Antenna

Also Published As

Publication number Publication date
FR964882A (en) 1950-08-26

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