Extended-definition television
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Extended-definition television (EDTV): Television in which
- (a) improvements are made to the US standard National Television System Committee (NTSC) television system;
- (b) the improvements are receiver-compatible with the standard NTSC television system;
- (c) the improvements modify the standard NTSC television system emission standards.
Note 1: EDTV improvements may include (a) a wider aspect ratio, (b) a higher picture definition than NTSC definition, and (c) any of the improvements used in improved-definition television (IDTV).
Note 2: 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."
Source: from Federal Standard 1037C