GB822624A - Method and apparatus for telegraph transmission at high speed - Google Patents

Method and apparatus for telegraph transmission at high speed

Info

Publication number
GB822624A
GB822624A GB28479/56A GB2847956A GB822624A GB 822624 A GB822624 A GB 822624A GB 28479/56 A GB28479/56 A GB 28479/56A GB 2847956 A GB2847956 A GB 2847956A GB 822624 A GB822624 A GB 822624A
Authority
GB
United Kingdom
Prior art keywords
signals
band
speed
occupying
link
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
GB28479/56A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB822624A publication Critical patent/GB822624A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

822,624. Signal transmission systems. NATALI, D. Sept. 18, 1956 [Sept. 19, 1955], No. 28479/56. Drawings to Specification. Class 40 (4). Alternating current telegraph signals from a channel of limited band width are recorded at one speed x and reproduced at an increased speed kx, thereby increasing the band width to that of the transmission link to be used, the reproduced signals then being frequencyshifted to place them in the frequency range of said link. Since the link is now used for only 1/kth of the duration of the original signal, the remainder of the duration may be used for the transmission of signals from further channels. As described, frequency modulated telegraph signals each occupying a band FmŒd# are recorded on magnetic tapes at speed x. These signals are then reproduced in turn at speed kn to produce a signal occupying a band k(FmŒd#). The signal then modulates a carrier Fo=kFmŒFc (where Fc is the centre frequency of the transmission link) and the lower sideband occupying a band width FcŒkdf is transmitted over the link. At the receiving end the signals are applied to a demodulator fed with frequency F0 and the lower side-band taken to produce a signal occupying the band k(FmŒdf) which is recorded at speed kx1. The recordings are then divided amongst a plurality of reproducers running at speed x1 to reproduce the original signals occupying the band FmŒdf.
GB28479/56A 1955-09-19 1956-09-18 Method and apparatus for telegraph transmission at high speed Expired GB822624A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT822624X 1955-09-19

Publications (1)

Publication Number Publication Date
GB822624A true GB822624A (en) 1959-10-28

Family

ID=11317821

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28479/56A Expired GB822624A (en) 1955-09-19 1956-09-18 Method and apparatus for telegraph transmission at high speed

Country Status (1)

Country Link
GB (1) GB822624A (en)

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