GB424503A - Improvements in or relating to electric carrier signalling systems - Google Patents

Improvements in or relating to electric carrier signalling systems

Info

Publication number
GB424503A
GB424503A GB2461933A GB2461933A GB424503A GB 424503 A GB424503 A GB 424503A GB 2461933 A GB2461933 A GB 2461933A GB 2461933 A GB2461933 A GB 2461933A GB 424503 A GB424503 A GB 424503A
Authority
GB
United Kingdom
Prior art keywords
impulses
grid
carrier
voltage
valve
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
GB2461933A
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2461933A priority Critical patent/GB424503A/en
Publication of GB424503A publication Critical patent/GB424503A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/02Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/08Amplitude regulation arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

424,503. Code telegraphy. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and FARREN, L. I., c /o General Electric Co., Wembley, Middlesex. Sept. 5, 1933, No. 24619. [Classes 40 (iii) and 40 (v)] In a voice-frequency telegraphic receiver in which a relay 13 is operated by applying trains of carrier waves, constituting the signal impulses, to a valve 12 which is preferably a gas-filled triode arranged to come into and out of action for equal values of the grid voltage, as described in Specification 408,961, the grid bias of the triode 12 varies automatically with the mean amplitude of the signals so that the impulses recorded may all be of the correct length, although the impulses may have been distorted in transmission. The envelopes of the carrier impulses are square at the transmitter but are rounded in transmission so that at the receiver the carrier takes time to rise to its maximum amplitude and to fall to zero. They will usually be recorded with the correct length by the relay 13 if the voltage at which they become operative upon the grid 11 is half the maximum voltage, and the grid bias is accordingly made to consist of a variable part, produced by a rectifier 10 and coupling 4 in dependence upon the average value of the signals received through the input valve 2, together with a fixed part determined by battery 14 and potentiometer 9 through resistance 7, the adjustments being such that the operative value of the grid voltage is reached when the amplitude of the carrier has risen or fallen to half its maximum. In a modification the function of the rectifier 10 is performed by a subsidiary anode in the valve 2, Fig. 2, (not shown). Specification 365,907 is referred to.
GB2461933A 1933-09-05 1933-09-05 Improvements in or relating to electric carrier signalling systems Expired GB424503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2461933A GB424503A (en) 1933-09-05 1933-09-05 Improvements in or relating to electric carrier signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2461933A GB424503A (en) 1933-09-05 1933-09-05 Improvements in or relating to electric carrier signalling systems

Publications (1)

Publication Number Publication Date
GB424503A true GB424503A (en) 1935-02-22

Family

ID=10214536

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2461933A Expired GB424503A (en) 1933-09-05 1933-09-05 Improvements in or relating to electric carrier signalling systems

Country Status (1)

Country Link
GB (1) GB424503A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552362A (en) * 1946-01-31 1951-05-08 Phillips Petroleum Co Telegraph receiving circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552362A (en) * 1946-01-31 1951-05-08 Phillips Petroleum Co Telegraph receiving circuit

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