GB561209A - Improvements relating to television - Google Patents

Improvements relating to television


Publication number
GB561209A GB1094642A GB1094642A GB561209A GB 561209 A GB561209 A GB 561209A GB 1094642 A GB1094642 A GB 1094642A GB 1094642 A GB1094642 A GB 1094642A GB 561209 A GB561209 A GB 561209A
United Kingdom
Prior art keywords
main carrier
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.)
Application number
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.)
British Thomson-Houston Co Ltd
Original Assignee
British Thomson-Houston 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 US395414A priority Critical patent/US2333969A/en
Application filed by British Thomson-Houston Co Ltd filed Critical British Thomson-Houston Co Ltd
Publication of GB561209A publication Critical patent/GB561209A/en
Expired legal-status Critical Current



    • H04N11/00Colour television systems
    • H04N11/06Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/18Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous and sequential signals, e.g. SECAM-system


561,209. Television ; multiplex wireless signalling. BRITISH THOMSONHOUSTON CO., Ltd. (General Electric Co.). Aug. 5, 1942, No. 10946. [Classes 40 (iii) and 40 (v)] A television system for the transmission of more than two colour images over a single channel comprises two separate synchronized means for generating image signals, one generating signals representative of one colour component and the other generating signals of the other colour components, and means for modulating the two signals on a common main carrier wave by different ones of two types of modulation, namely one by frequency or phase modulation and the other by amplitude modulation. The modulation of the main carrier is effected directly by both signals ; or one signal is modulated directly on the main carrier in accordance with one type of modulation and the other signal is first modulated on a subcarrier wave which is then modulated on the main carrier in accordance with the other type of modulation. In the arrangement shown, one signal is generated by scanning the picture 10, Fig. 1, in one colour, through a green filter 15 by a camera 12, and the other signal is generated by an interlaced scanning in two colours, through a rotating red and blue filter 14 by a camera 11. The signals from the camera 11 are mixed in a mixer 32 with blanking signals from a pulse generator 18 and are fed to a frequency modulator 43 for a high-frequency oscillation generator 44. The signals from the other camera 12 are mixed in a mixer 30 with synchronizing signals and blanking signals derived from the pulse generator 18 and are fed to an amplitude modulator 41 for the highfrequency oscillation generator 44. The doubly modulated carrier is amplified by an amplifier 45 and radiated by an antenna 13. At the receiver, Fig. 3, the two modulations are separated. The amplitude modulations control the deflection generators 93, 94 and a cathoderay image reproducer 77. The frequency modulations corresponding to the interlaced scanning control cathode-ray image reproducers 75, 76 keyed in mixers 80, 81 by keying pulses derived from the synchronizing pulses. The three cathode-ray tubes are observed by an eye 102 through semi-transparent mirrors 100, 101. In a modified receiver, the three cathoderay tubes are substantially side by side and lenses project and combine their images on one screen. Specification 424,743 is referred to.
GB1094642A 1941-05-27 1942-08-05 Improvements relating to television Expired GB561209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US395414A US2333969A (en) 1941-05-27 1941-05-27 Television system and method of operation

Publications (1)

Publication Number Publication Date
GB561209A true GB561209A (en) 1944-05-10



Family Applications (1)

Application Number Title Priority Date Filing Date
GB1094642A Expired GB561209A (en) 1941-05-27 1942-08-05 Improvements relating to television

Country Status (3)

Country Link
US (1) US2333969A (en)
FR (1) FR948147A (en)
GB (1) GB561209A (en)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734939A (en) * 1956-02-14 Color television
US2563406A (en) * 1951-08-07 Electronic commutator
BE472522A (en) * 1945-09-27
US2524987A (en) * 1946-10-09 1950-10-10 Joseph O Mesa Display arrangement for an aircraft-coordinating system
US2560168A (en) * 1946-12-31 1951-07-10 Rca Corp Color television system
US2552070A (en) * 1947-06-02 1951-05-08 Rca Corp Color television camera
US2567040A (en) * 1947-12-26 1951-09-04 Rca Corp Color television
US2612553A (en) * 1947-12-27 1952-09-30 John H Homrighous Television system
US2545420A (en) * 1947-12-31 1951-03-13 Rca Corp Color television receiving system
US2596918A (en) * 1948-01-30 1952-05-13 Rca Corp Television receiving system
US2598504A (en) * 1948-04-23 1952-05-27 Times Facsimile Corp Color picture transmission and reproduction
US2558489A (en) * 1949-06-06 1951-06-26 Meguer V Kalfaian Color television system
FR963483A (en) * 1949-07-10 1950-07-11
BE497647A (en) * 1949-08-20
US2664462A (en) * 1949-08-31 1953-12-29 Rca Corp Multiplexed signal transmission
NL156187B (en) * 1949-09-23 Lilly Co Eli Process for the preparation of an antibiotic, and a process for the preparation of compositions having efficacy against bacteria and parasite forms.
NL244186A (en) * 1949-09-24
NL156189B (en) * 1949-09-24 Upjohn Co Process for the preparation of the antibiotic lincomycin.
US2657255A (en) * 1950-05-20 1953-10-27 Bell Telephone Labor Inc Color television system
US2708268A (en) * 1951-03-16 1955-05-10 Products And Licensing Corp Sequential phase-shifted amplitude modulated carrier wave
US2831916A (en) * 1951-03-17 1958-04-22 Gen Electric Single-carrier color television systems
BE509966A (en) * 1951-03-17
US2649499A (en) * 1951-08-22 1953-08-18 Rca Corp Simplified color television receiver
US2822419A (en) * 1951-12-26 1958-02-04 Harry R Lubcke Color television system
US2886632A (en) * 1952-06-28 1959-05-12 Philco Corp Carrier-wave modulating system
US2911461A (en) * 1952-10-01 1959-11-03 Ostrow Eugene Edward Colored television system
BE525449A (en) * 1953-01-02
NL175913B (en) * 1953-02-09 Degussa Improvement of the method for the manufacture of d, l-penicillamine, and amine salts thereof.
BE530175A (en) * 1953-07-24
US2841640A (en) * 1953-08-13 1958-07-01 Gen Precision Lab Inc Color television system
NL227197A (en) * 1957-04-24
US3061669A (en) * 1959-11-23 1962-10-30 Nathaniel L Leek Multiplex television system
US3294898A (en) * 1963-08-21 1966-12-27 Polaroid Corp Compatible color television
US3506782A (en) * 1966-11-09 1970-04-14 Eastman Kodak Co Status display system and cathode ray tube therefor
US3518360A (en) * 1967-10-18 1970-06-30 Rca Corp Portable color television camera system
JPS5025775B1 (en) * 1969-05-31 1975-08-26
US3706842A (en) * 1971-02-01 1972-12-19 Magnavox Co Method to double transmission speed of telephone network facsimile

Also Published As

Publication number Publication date
FR948147A (en) 1949-07-22
US2333969A (en) 1943-11-09

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