The second generation EDTV (EDTV-II) is an enhanced wide-screen NTSC transmission system, which provides existing NTSC broadcasters with wide-screen (16:9 aspect ratio) and high picture quality, while maintaining the compatibility with NTSC transmission system and with existing NTSC receivers. The first generation EDTV (CLEARVISION) was recommended as Recommendation ITU-R BT.797.CLEARVISION’s enhancement modules are optional to EDTV-II, and the modules are equally applicable to both conventional NTSC and EDTV-II signals.