GB1046275A - Improvements relating to colour television receivers - Google Patents

Improvements relating to colour television receivers

Info

Publication number
GB1046275A
GB1046275A GB1920763A GB1920763A GB1046275A GB 1046275 A GB1046275 A GB 1046275A GB 1920763 A GB1920763 A GB 1920763A GB 1920763 A GB1920763 A GB 1920763A GB 1046275 A GB1046275 A GB 1046275A
Authority
GB
United Kingdom
Prior art keywords
axis
axes
modulation
switched
demodulation
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
GB1920763A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1046275A publication Critical patent/GB1046275A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
    • H04N11/165—Decoding means therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Color Television Systems (AREA)

Abstract

1,046,275. Colour television. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. May 15, 1963 [May 15, 1962], No. 19207/63. Heading H4F. In a colour television receiver synchronous demodulator circuit for use with a quadrature modulated colour subcarrier of, for example, the N.T.S.C. type but in which one of the modulation axes is periodically (e.g. at line or frame rate) switched through 180 degrees for the purpose of reducing colour falsification due to phase errors, and wherein the demodulation axes are arranged not to be identical with the modulation axes, means are provided to switch the directions of the demodulation axes synchronously with the switching of the modulation axis so that the angular relationship between the respective demodulation axes and the modulation axis which is not switched is maintained but the sign of the relationship is reversed. Figs. 5 and 6 illustrate the operation where the modulation I axis is periodically reversed and demodulation is effected along the R-Y and B-Y axes. The R-Y demodulation axis is switched through 246 degrees and the B-Y axis through 66 degrees. Fig. 7 (not shown) illustrates the operation when the Q modulation axis is switched through 180 degrees. Figs. 8 and 9 illustrate the operation when the Q modulation axis is switched and demodulation is effected along the X and Z axes (see " Colour Television" by Carut and Townsend, pages 241-248). Similar operation (not illustrated) applies when the I axis is switched.
GB1920763A 1962-05-15 1963-05-15 Improvements relating to colour television receivers Expired GB1046275A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1962T0022120 DE1299312B (en) 1962-05-15 1962-05-15 Demodulation circuit for a color television receiver with line-frequency phase switching

Publications (1)

Publication Number Publication Date
GB1046275A true GB1046275A (en) 1966-10-19

Family

ID=7550410

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1920763A Expired GB1046275A (en) 1962-05-15 1963-05-15 Improvements relating to colour television receivers

Country Status (4)

Country Link
AT (1) AT234181B (en)
BE (1) BE632225A (en)
DE (1) DE1299312B (en)
GB (1) GB1046275A (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU31205A1 (en) * 1951-01-22

Also Published As

Publication number Publication date
BE632225A (en)
DE1299312B (en) 1969-07-17
AT234181B (en) 1964-06-25

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