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    "abstract": "The concept of a compatible hierarchy of studio standards has been formely introduced. This paper, after reminding parameters of the different members discusses extensions of this hierarchical family. It emphasizes the complementarity of the different levels when the hierarchy of standards is associated with a hierarchy of studio equipment. Members of the hierarchy are mainly described by the signal representation of their luminance component. Other levels can be derived from the different options for the colour difference signal representation. Practical considerations on performance and interface aspects allow selection of the most appropriate options. Further analysis of practical implementation of digital interfaces show that some interlace and progressive signal representations can make use of the same pieces of equipment. The hierarchy of equipment offers a great flexibility with respect to cost or technical constraints in that the most appropriate standard can be used for the application. These considerations emphasize the attractiveness of compatible evolution in the introduction of new television systems.",
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    "authors": [
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        "affiliation": "Thomson-CSF/LER Rennes, France",
        "bio": "Jean Chatel spent all his career in the field of digital television. He contributed to work carried out for the development of digital television standards which have lead to the definition of the Recommendation 601. His experience includes multidimensional sampling and processing for video applications. He is the author of patents related to digital frequency modulaton and demodulation, and to digital encoding and decoding of PAL and SECAM signals for picture enhancement. He is now with Thomson-CSF/LER in Rennes, France, (corporate research laboratory of Thomson) where he is head of the Digital Picture Processing Laboratory involved in development of HDTV equipment. He is also project leader of Group 02 in charge of studio standards and standards conversion studies within the Eureka EU95 program.",
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    "docTitle": "Compatible Hierarchy of Studio Standards",
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