Peter L. Peres wrote:

>   My idea is, that since the Bresenham circle algorythm exists, it is
> possible to compute the 'next' value for a phase continuous sine wave
> without storing any table and by obtaining results directly in integers
> (no floats no lookups no nothing).

Ok... Bresenham will get you the appropriate X coordinate for iterative steps in
Y (or vice versa), but then all you have is a pair of coordinates. How are you
going to convert those into sines? If I understand you correctly, you'll have
[r.cos(t),r.sin(t)], but since you don't have t, you don't know the angle for
which you have the sine value. What you've got, for a given Y is
sqrt((r*r)-(Y*Y)).

>   Any single DTMF tone starts at phase 0. So, one can use the Bresenham
> circle algorythm to approximate the 1st quarter wave of a sine. This
> should replace the quarter sine table.
>

Do you mean you're going to represent a sine wave as a sequence of quarter
circles?! Hmmmm... perhaps I'm missing something?

Cheers,

Ben