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/* sIgpAck
* for
* pure-data
* www.weiss-archiv.de */
#include "m_pd.h"
#ifdef _MSC_VER
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
/* ------------------------ sp.vowel~ ----------------------------- */
/* simple formant filter */
/* code from musicdsp.org posted by alex@smartelectronix.com */
static t_class *vowel_tilde_class;
typedef struct _vowel_tilde
{
t_object x_obj;
t_sample x_vowelnum;
float x_f;
} t_vowel_tilde;
static void *vowel_tilde_new(t_floatarg vowelnum)
{
t_vowel_tilde *x = (t_vowel_tilde *)pd_new(vowel_tilde_class);
x->x_vowelnum = vowelnum;
outlet_new(&x->x_obj, gensym("signal"));
floatinlet_new(&x->x_obj, &x->x_vowelnum);
x->x_f = 0;
if(vowelnum) x->x_vowelnum = vowelnum;
else x->x_vowelnum = 0;
return (x);
}
const double coeff[5][11]= {
{ 8.11044e-06,
8.943665402, -36.83889529, 92.01697887, -154.337906, 181.6233289,
-151.8651235, 89.09614114, -35.10298511, 8.388101016, -0.923313471 ///A
},
{ 4.36215e-06,
8.90438318, -36.55179099, 91.05750846, -152.422234, 179.1170248, ///E
-149.6496211,87.78352223, -34.60687431, 8.282228154, -0.914150747
},
{ 3.33819e-06,
8.893102966, -36.49532826, 90.96543286, -152.4545478, 179.4835618,
-150.315433, 88.43409371, -34.98612086, 8.407803364, -0.932568035 ///I
},
{ 1.13572e-06,
8.994734087, -37.2084849, 93.22900521, -156.6929844, 184.596544, ///O
-154.3755513, 90.49663749, -35.58964535, 8.478996281, -0.929252233
},
{ 4.09431e-07,
8.997322763, -37.20218544, 93.11385476, -156.2530937, 183.7080141, ///U
-153.2631681, 89.59539726, -35.12454591, 8.338655623, -0.910251753
}
};
static double memory[10] = {0,0,0,0,0,0,0,0,0,0};
float formant_filter (float in, int vowelnum)
{
float res;
res= (float) (coeff[vowelnum][0]*in +
coeff[vowelnum][1]*memory[0] +
coeff[vowelnum][2]*memory[1] +
coeff[vowelnum][3]*memory[2] +
coeff[vowelnum][4]*memory[3] +
coeff[vowelnum][5]*memory[4] +
coeff[vowelnum][6]*memory[5] +
coeff[vowelnum][7]*memory[6] +
coeff[vowelnum][8]*memory[7] +
coeff[vowelnum][9]*memory[8] +
coeff[vowelnum][10]*memory[9]);
memory[9]=memory[8];
memory[8]=memory[7];
memory[7]=memory[6];
memory[6]=memory[5];
memory[5]=memory[4];
memory[4]=memory[3];
memory[3]=memory[2];
memory[2]=memory[1];
memory[1]=memory[0];
memory[0]=(double)res;
return res;
}
static t_int *vowel_tilde_perform(t_int *w)
{
t_vowel_tilde *x = (t_vowel_tilde *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
float f, value;
while (n--)
{
f = *in++;
value = formant_filter(f, (int)x->x_vowelnum);
*out++ = value;
}
return (w+5);
}
static void vowel_tilde_dsp(t_vowel_tilde *x, t_signal **sp)
{
dsp_add(vowel_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void vowel_tilde_setup(void)
{
vowel_tilde_class = class_new(gensym("sp.vowel~"), (t_newmethod)vowel_tilde_new, 0,
sizeof(t_vowel_tilde), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(vowel_tilde_class, t_vowel_tilde, x_f);
class_addmethod(vowel_tilde_class, (t_method)vowel_tilde_dsp, gensym("dsp"), 0);
class_addmethod(vowel_tilde_class, (t_method)formant_filter, gensym("formant_filter"), A_GIMME, A_NULL);
}
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