Single-Channel Backward-Compatible EDTV Systems

In this paper, we describe some methods for adding additional information to a compatible NTSC broadcast signal so that an advanced receiver can decode that information to provide improved picture quality (Extended Definition Television, EDTV), while a standard NTSC receiver will display an image with minimally visible impairments. In particular, we transmit chrominance information at one half the frame rate and use alternate frames to encode high definition luminance information in the chrominance signal. This is useful for any EDTV system. We also suggest a particular design where we usurp some active lines from the top and bottom of the picture and encode augmentation information into this region so that both the EDTV and the NTSC receiver receive similar looking wide screen pictures, the EDTV one containing greater resolution.

Published

1988-01

Content type

Original Research

DOI

10.5594/M00531

ISBN

978-1-61482-917-1