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Re: Why, a lot of good questions...

OK,

I looked at the article in question and it brings up a few questions:

1) There is nothing stating what the quantization level is - since the y axis is labelled -1 to 1, it suggests to me the levels are floating point (were they converted to this after the integer quantization is done or was integer quantization even done? I imagine it is but it not stated anywhere in the post that it was 16 bit)

2) 1 degree of phase is still a large phase shift - do we even know what is discernable by the ear? I imagine it is frequency dependent too.

3) The linear interpolation between points doesn't tell the whole story and massages the differences visually. I would love to see (a) all the 8 phases from 0 to 7 on the same axis, (b) the original analog signal sampled and the output after the reconstruction filter for each phase on the same axis, and (c) the 8 phases after reconstruction filter on the same axis. If you change the values of two points slightly the line between them looks almost the same, if you put it through a reconstruction filter the differences should become clearer.

I am not trying to discount any of this - I am just being overly skeptical until I get all the details of these results. If that is 16 bit sampling it does seem that there is pretty darn good phase accuracy even at 20Khz.

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