Extended-definition television (EDTV) is television with
- improvements to the U.S. standard National Television System Committee (NTSC) television system;
- improvements that are receiver-compatible with the standard NTSC television system;
- improvements that modify the standard NTSC television system emission standards.
EDTV improvements may include
When EDTV signals are transmitted in the 4:3 aspect ratio, it is referred to as
EDTV. When transmitted in a wider aspect ratio, it is referred to as EDTV-Wide.