By Jim Slater
ISBN-10: 0273031228
ISBN-13: 9780273031222
Technical presentation of present tv platforms. the writer deals feedback for the longer term, describes the present color tv criteria, discusses the effect of satellite tv for pc transmission and its implications for HDTV and considers electronic transmission structures.
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Extra resources for Modern Television Systems: To HDTV and Beyond
Sample text
4. 5. 34 International Electrotechnical Vocabulary, Chapter 723. 10. Townsend, PAL Colour Television, IEE Monograph Series 3, 1970. 14, 1964. Sims, Principles of PAL Colour Television, Iliffe, 1969. FCC Standard for NTSC Transmissions, Report and Order of Dec. 17 1953, FCC Document 53–1663. 4 The development of PAL and SECAM The SECAM and PAL systems were designed so that they would make use of the basic tenets of the NTSC system, but would avoid the two most objectionable shortcomings of this system, its susceptibility to phase errors, and the consequent need for receivers to be fitted with a hue control.
The system became known as SECAM, an acronym for Sequentiel Couleur à Mémoire and many different versions were developed before 1965, when the French settled on SECAM III, which is the version nowadays known simply as SECAM. The basics of the SECAM system SECAM is defined internationally as A simultaneous sequential colour television system using, in baseband, a composite colour signal comprising a luminance signal and two chrominance components, each of which is transmitted sequentially as frequency modulation of a separate subcarrier.
E. locked together. Since the SECAM signal uses frequency-modulated subcarriers, the amplitude of the chrominance signals is not related to the overall level of the picture signal, so it is not possible to directly mix or fade SECAM signals, which means that far more complex processing is necessary in a SECAM studio. The usual method used in earlier days was to carry out all the necessary operations on the Red, Green and Blue components of the signal, which means using three separate channels. , but where composite SECAM signals are to be mixed or faded they must each be decoded, their subcarriers being demodulated, and the mixing or fading operation must then be carried out on the R, G, B colour separation signals separately.
Modern Television Systems: To HDTV and Beyond by Jim Slater
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