[Stk] Blit error?

[Julius Smith]

Hi Sean,

0. Yes, it looks like that should be -1 not +1.

1. Maybe the thought was "complex harmonics"?  So, each sinusoid
contributes 2 except at dc and fs/2 where it's only 1

- Julius

On Tue, Sep 22, 2020 at 6:07 AM Sean Luke <sean at cs.gmu.edu> wrote:

> Hi all from Washington, DC.  I am comparing the code in Blit.cpp against
> the original paper here:
>
>         https://ccrma.stanford.edu/~stilti/papers/blit.pdf
>
> ... and have come across two oddities.
>
> 0. The paper says that M as: "M is the largest odd integer not exceeding
> the period P in samples", and describes M as
>
>         M = 2 * Floor[P/2] + 1
>
> (and this is what Blit.cpp does) But these two things are not the same.
> If P is an even number, then M = P + 1.  That is, it exceeds P.  I think I
> am misunderstanding something, and was hoping you might either be able to
> set me straight.
>
> 1. The paper describes M as "the number of harmonics" (page 5, top left
> paragraph).  This doesn't seem to be true: if M is close to P, then it must
> be describing approximately *twice* the "number of harmonics" before we
> exceed Nyquist.  Indeed Blit.cpp has a variable called maxHarmonics and M
> is about twice that.  Wanted to make sure the paper's description is
> incorrect.
>
> Sean Luke
>
>
>
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