Fully compatible EDTV for improving both Y and color signals by using a single new subcarrier

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Abstract
An enhanced-definition TV (EDTV) is discussed in which the resolution of a Y signal is extended both horizontally and vertically. Horizontal extension is a achieved by inserting the information into the so-called Fukinuki hole, and vertical extension by progressive interlace scan conversion. The resulting improvement in color signals is studied and a scheme for extending the bandwidth of a Q signal appropriate to the proposed EDTV system is proposed. The relationship between various methods of extension is clarified.