Methinks you confused narrower with wider in the 16:9 SD example. If 854 horizontal samples equals 'square pixels,' then 720 horizontal samples would have pixels that are wider than they are tall.
John----- Original Message -----
In the case of 16:9 the samples are also narrower than they are tall ( i.e. 720 x 480 versus 854 x 480 for square sample 16:9).
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