[sdiy] Digital interpolation filtering

[Eric Brombaugh]

Errrrrrr make that 1.0. :P
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Eric Brombaugh wrote:
> sin(x)/x @ x=0 is 0 . The rationale comes from a calculus concept called 
> L'Hopital's rule: since the rate of change of sin(x) near 0 = 1 and the 
> rate of change of x near 0 = 1 also, they're both going towards 0 at 
> exactly the same rate, so the ratio is 1.0.
> 
> http://en.wikipedia.org/wiki/L%27H%C3%B4pital%27s_rule