GB591357A - Improvements in or relating to carrier wave transmitter systems - Google Patents

Improvements in or relating to carrier wave transmitter systems

Info

Publication number
GB591357A
GB591357A GB15160/44A GB1516044A GB591357A GB 591357 A GB591357 A GB 591357A GB 15160/44 A GB15160/44 A GB 15160/44A GB 1516044 A GB1516044 A GB 1516044A GB 591357 A GB591357 A GB 591357A
Authority
GB
United Kingdom
Prior art keywords
frequency
source
sources
modulated
tone
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
GB15160/44A
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.)
PRESS WIRELESS Inc
Original Assignee
PRESS WIRELESS Inc
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 PRESS WIRELESS Inc filed Critical PRESS WIRELESS Inc
Publication of GB591357A publication Critical patent/GB591357A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00095—Systems or arrangements for the transmission of the picture signal
    • H04N1/00103—Systems or arrangements for the transmission of the picture signal specially adapted for radio transmission, e.g. via satellites

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Facsimiles In General (AREA)

Abstract

591,357. Modulating systems. PRESS WIRELESS, Inc. Aug. 9; 1944, No. 15160. Convention date, Sept. 18, 1943. [Class 40 (v)] The aerial 5 is energized by radio-frequency amplifier 4 fed from a fixed carrier frequency source 1 and a frequency-modulated source 2 of carrier controlled by a signal source 3 in such a way that the frequency difference between sources 1 and 2 is equal to the tone frequency it is desired to produce at the output of a co-operating receiver. The second detector, .10 of a known amplitude modulation superheterodyne receiver feeds the output stage' 11 with the translated variable tone frequency. The system is particularly applicable to the transmission of facsimile signals in which light and shade values are represented as. different tone frequencies, as described in Specifications 537,689 and 537,699. In a modification, both sources 1, 2 are frequency modulated in opposite senses. The two carriers may be radiated from separate aerials.
GB15160/44A 1943-09-18 1944-08-09 Improvements in or relating to carrier wave transmitter systems Expired GB591357A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US502870A US2378013A (en) 1943-09-18 1943-09-18 Synthetic modulator system

Publications (1)

Publication Number Publication Date
GB591357A true GB591357A (en) 1947-08-15

Family

ID=23999752

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15160/44A Expired GB591357A (en) 1943-09-18 1944-08-09 Improvements in or relating to carrier wave transmitter systems

Country Status (2)

Country Link
US (1) US2378013A (en)
GB (1) GB591357A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831059A (en) * 1950-03-15 1958-04-15 British Telecomm Res Ltd Electric carrier telegraph systems
US2758202A (en) * 1950-07-12 1956-08-07 Padevco Inc Frequency modulation system
US3919640A (en) * 1974-11-08 1975-11-11 Northern Illinois Gas Co Simultaneous analog and digital data transfer

Also Published As

Publication number Publication date
US2378013A (en) 1945-06-12

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