/*
* Get the frequency from x, where x is [0..1]
*/
REALTYPE FilterParams::getfreqx(REALTYPE x)
{
if(x > 1.0)
x = 1.0;
REALTYPE octf = POW(2.0, getoctavesfreq());
return getcenterfreq() / sqrt(octf) * pow(octf, x);
}
REALTYPE Resonance::getfreqresponse(REALTYPE freq){
REALTYPE l1=log(getfreqx(0.0)*ctlcenter),
l2=log(2.0)*getoctavesfreq()*ctlbw,sum=0.0;
for (int i=0;i<N_RES_POINTS;i++) if (sum<Prespoints[i]) sum=Prespoints[i];
if (sum<1.0) sum=1.0;
REALTYPE x=(log(freq)-l1)/l2;//compute where the n-th hamonics fits to the graph
if (x<0.0) x=0.0;
x*=N_RES_POINTS;
REALTYPE dx=x-floor(x);x=floor(x);
int kx1=(int)x; if (kx1>=N_RES_POINTS) kx1=N_RES_POINTS-1;
int kx2=kx1+1;if (kx2>=N_RES_POINTS) kx2=N_RES_POINTS-1;
REALTYPE result=(Prespoints[kx1]*(1.0-dx)+Prespoints[kx2]*dx)/127.0-sum/127.0;
result=pow(10.0,result*PmaxdB/20.0);
return(result);
};
/*
* Get the x coordinate from frequency (used by the UI)
*/
REALTYPE FilterParams::getfreqpos(REALTYPE freq)
{
return (log(freq) - log(getfreqx(0.0))) / log(2.0) / getoctavesfreq();
}
/*
* Get the x coordinate from frequency (used by the UI)
*/
REALTYPE Resonance::getfreqpos(REALTYPE freq){
return((log(freq)-log(getfreqx(0.0)))/log(2.0)/getoctavesfreq());
};
