Extended-definition television (EDTV) is television with

1. improvements to the U.S. standard National Television System Committee (NTSC) television system;
2. improvements that are receiver-compatible with the standard NTSC television system;
3. improvements that modify the standard NTSC television system emission standards.

EDTV improvements may include

• a wider aspect ratio,
• a higher picture definition than NTSC definition, and
• any of the improvements used in improved-definition television (IDTV).

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.

See also

• Federal Standard 1037C

References