GB624741A - Improvements in or relating to frequency shift and like signalling systems - Google Patents

Improvements in or relating to frequency shift and like signalling systems

Info

Publication number
GB624741A
GB624741A GB2675/47A GB267547A GB624741A GB 624741 A GB624741 A GB 624741A GB 2675/47 A GB2675/47 A GB 2675/47A GB 267547 A GB267547 A GB 267547A GB 624741 A GB624741 A GB 624741A
Authority
GB
United Kingdom
Prior art keywords
frequency
switch
keying
voltage
oscillator
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
GB2675/47A
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.)
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
Application filed by Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB624741A publication Critical patent/GB624741A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • H04N5/40—Modulation circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • 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
    • H04L27/12—Modulator circuits; Transmitter circuits
    • 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

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
GB2675/47A 1946-01-29 1947-01-28 Improvements in or relating to frequency shift and like signalling systems Expired GB624741A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US644147A US2492795A (en) 1946-01-29 1946-01-29 Frequency shift signaling system

Publications (1)

Publication Number Publication Date
GB624741A true GB624741A (en) 1949-06-15

Family

ID=24583644

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2675/47A Expired GB624741A (en) 1946-01-29 1947-01-28 Improvements in or relating to frequency shift and like signalling systems

Country Status (4)

Country Link
US (1) US2492795A (cs)
BE (1) BE471838A (cs)
FR (1) FR941327A (cs)
GB (1) GB624741A (cs)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2672509A (en) * 1949-04-01 1954-03-16 Mccoy John Harvey Teletypewriter frequency shift transmission
BE548373A (cs) * 1955-06-10
US2984701A (en) * 1960-02-18 1961-05-16 Collins Radio Co Phase lock synchronizer for controlled-shift data communication system
US3167712A (en) * 1961-03-17 1965-01-26 Itt Frequency shift keyer with automatic frequency control
US4402551A (en) * 1981-09-10 1983-09-06 Wood Edward T Method and apparatus to complete horizontal drain holes

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2054883A (en) * 1932-12-24 1936-09-22 Schlesinger Kurt Potential-steadying device making use of glow lamps
US2279659A (en) * 1937-04-13 1942-04-14 Rca Corp Frequency modulator
US2176168A (en) * 1937-08-21 1939-10-17 Henri Jean Joseph Marie De De Frequency modulated signal
US2285044A (en) * 1941-03-11 1942-06-02 Rca Corp Wave length modulation system
US2403358A (en) * 1941-04-16 1946-07-02 Press Wireless Inc Facsimile transmitting and reproducing system, method, and apparatus
US2379614A (en) * 1942-03-27 1945-07-03 Rca Corp Frequency modulation
US2351193A (en) * 1942-06-13 1944-06-13 Rca Corp Frequency modulation detector circuit
US2339608A (en) * 1942-08-17 1944-01-18 Gen Electric Frequency modulation system
US2401629A (en) * 1943-02-22 1946-06-04 Rca Corp Tone converter
US2398793A (en) * 1943-07-03 1946-04-23 Galvin Mfg Corp Radio receiving system
US2380959A (en) * 1943-10-21 1945-08-07 Standard Telephones Cables Ltd Frequency changing signal generating system

Also Published As

Publication number Publication date
FR941327A (fr) 1949-01-07
US2492795A (en) 1949-12-27
BE471838A (cs)

Similar Documents

Publication Publication Date Title
GB480289A (en) Improvements relating to wireless telegraph systems
GB624741A (en) Improvements in or relating to frequency shift and like signalling systems
US2326314A (en) Frequency modulation
US2426295A (en) Frequency modulation system with crystal oscillator
GB622140A (en) Improvements in or relating to piezo - electric crystal circuit arrangements
GB567585A (en) Improvements in or relating to electron discharge valve oscillators
GB607798A (en) Improvements in or relating to frequency-control circuits
GB621850A (en) Radio frequency telegraph and like communication systems
GB665074A (en) Improvements in and relating to balanced modulators
US1988960A (en) Radio transmitter
US2331821A (en) Frequency modulation
GB445543A (en) Improvements in or relating to electrical high frequency oscillating circuit arrangements
USRE22834E (en) Frequency modulation system
GB550554A (en) Improvements relating to frequency modulation
US1847190A (en) Electric wave signaling system
US2389879A (en) Frequency modulation
US2590282A (en) Variable impedance device
US3221268A (en) Crystal-controlled oscillation generator and associated circuitry
US2379201A (en) Timing modulation
GB610951A (en) Improvements in or relating to frequency modulated radio and like transmitters
GB606582A (en) Improvements in or relating to modulated carrier wave systems
US2399268A (en) Frequency modulation
GB628901A (en) Improvements in or relating to frequency determining circuits for high frequency oscillators
GB721105A (en) Improvements in or relating to circuits for use in frequency-shift telegraphy transmitters
US2785310A (en) Frequency-shift transmitter