Hi Brent,
A quarter table cos is exactly the same as a quarter table sin.
Only backwards, and not telling which quarter it is makes it a
quarter of either sin or cos. For one single output becomes irrelevant
as you only need one.
So I think it is just a matter of taste the name to call it.
Luis Cupido.
ct1dmk.
On 6/21/2011 8:03 PM, KD0GLS wrote:
On Jun 21, 2011, at 13:39, Chris Albertson wrote:
I used only 90 degrees of the table.
Yes, as did I and most implementations, but why a cosine quarter-table instead
of the more common sine? A quick look at the data sheets (and the waveforms in
the theory-of-op sections) for the two devices suggests they are clearly
calling out one or the other, but without rationale regarding the choice.
.73,
Brent, KD0GLS, Minneapolis
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