RECOMMENDATION ITU-R BT.1298 - Enhanced wide-screen NTSC TV transmission system
ANNEX 1 - EDTV-II system specification
1 Introduction
2 Features of EDTV-II transmission system
    2.1 Vertical conversion to 360-line letterbox picture
    2.2 Enhancement by vertical helpers (VH, VT)
    2.3 Enhancement by horizontal helper (HH)
    2.4 Wide-screen signalling system
    2.5 Chrominance signal, audio signal
3 Input signal formats for EDTV-II transmission system
4 Wide-screen technique of EDTV-II
5 EDTV-II techniques for enhancement of picture quality
    5.1 Enhancement technique for vertical resolution
    5.2 Enhancement technique for horizontal resolution
    5.3 Interference visibility reduction techniques in multiplexing the vertical helpers
6 Signalling
APPENDIX 1 TO ANNEX 1 - Recommended practices
1 Pre-filtering for input signal sources
2 Pre-combing in the horizontal helper (HH) multiplexing