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fix comment for sinc interpolation table

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a Hanning window is applied, rather than a Hamming  window
This commit is contained in:
derselbst 2018-07-19 17:22:44 +02:00
parent bb413011f7
commit 8afb46515f
1 changed files with 4 additions and 3 deletions
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7
src/rvoice/fluid_rvoice_dsp.c
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@ -98,9 +98,10 @@ void fluid_rvoice_dsp_config(void)
/* sinc(0) cannot be calculated straightforward (limit needed for 0/0) */
if(fabs(i_shifted) > 0.000001)
{
v = (fluid_real_t)sin(i_shifted * M_PI) / (M_PI * i_shifted);
/* Hamming window */
v *= (fluid_real_t)0.5 * (1.0 + cos(2.0 * M_PI * i_shifted / (fluid_real_t)SINC_INTERP_ORDER));
double arg = M_PI * i_shifted;
v = (fluid_real_t)sin(arg) / (arg);
/* Hanning window */
v *= (fluid_real_t)0.5 * (1.0 + cos(2.0 * arg / (fluid_real_t)SINC_INTERP_ORDER));
}
else
{