Compatibility in sub-band HDTV coding

An investigation is made on the compatibility of the video formats TV, EDTV, HDTV/sub int/ and HDTV/sub pro/ in three-dimensional sub-band coding. A more reasonable joint solution is proposed for the issues of bit rate compression, digital transmission evolution and interlace-to-progressive scanning conversion. The diamond shaped spectrum of the conventional HDTV/sub int/ signal format is represented by a kind of switching HDTV/sub int/ signal which includes three components and motion detection bits (MDB). The first component and the MDB represent TV. The first plus the second component and the MDB represent EDTV. HDTV/sub pro/ is split into switching HDTV/sub int/ and an extra component. The switching threshold and the length of temporal filter banks are discussed. Based on the proposed method, the transmission system can evolve through four steps: TV, EDTV, HDTV/sub int/ and HDTV/sub pro/. Results of bit rate compression are also presented.<
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