Created
April 11, 2018 21:54
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--- a/src/DSP/SVFilter.cpp | |
+++ b/src/DSP/SVFilter.cpp | |
@@ -102,6 +102,7 @@ SVFilter::response SVFilter::computeResponse(int type, | |
void SVFilter::computefiltercoefs(void) | |
{ | |
+ //printf("compute coeff (%f, %f, %d)\n", freq, q, stages); | |
par.f = freq / samplerate_f * 4.0f; | |
if(par.f > 0.99999f) | |
par.f = 0.99999f; | |
@@ -125,7 +126,7 @@ void SVFilter::setfreq(float frequency) | |
bool nyquistthresh = (abovenq ^ oldabovenq); | |
//if the frequency is changed fast, it needs interpolation | |
- if((rap > 3.0f) || nyquistthresh) { //(now, filter and coefficients backup) | |
+ if(true || (rap > 3.0f) || nyquistthresh) { //(now, filter and coefficients backup) | |
if(!firsttime) | |
needsinterpolation = true; | |
ipar = par; | |
@@ -168,7 +169,7 @@ void SVFilter::setstages(int stages_) | |
computefiltercoefs(); | |
} | |
-void SVFilter::singlefilterout(float *smp, fstage &x, parameters &par) | |
+void SVFilter::singlefilterout(float *smp, fstage &x, parameters &par, parameters &par2) | |
{ | |
float *out = NULL; | |
switch(type) { | |
@@ -189,10 +190,16 @@ void SVFilter::singlefilterout(float *smp, fstage &x, parameters &par) | |
warnx("Impossible SVFilter type encountered [%d]", type); | |
} | |
+ //printf("delta q = %f\n", (par.q-par2.q)/buffersize_f); | |
+ //printf("delta f = %f\n", (par.f-par2.f)/buffersize_f); | |
for(int i = 0; i < buffersize; ++i) { | |
- x.low = x.low + par.f * x.band; | |
- x.high = par.q_sqrt * smp[i] - x.low - par.q * x.band; | |
- x.band = par.f * x.high + x.band; | |
+ const float t = i/buffersize_f; | |
+ const float par_f = (1-t)*par.f + t*par2.f; | |
+ const float par_q = (1-t)*par.q + t*par2.q; | |
+ const float par_q_sqrt = sqrtf(par_q); | |
+ x.low = x.low + par_f * x.band; | |
+ x.high = par_q_sqrt * smp[i] - x.low - par_q * x.band; | |
+ x.band = par_f * x.high + x.band; | |
x.notch = x.high + x.low; | |
smp[i] = *out; | |
} | |
@@ -211,6 +218,8 @@ void SVFilter::singlefilterout(float *smp, fstage &x, parameters &par) | |
void SVFilter::filterout(float *smp) | |
{ | |
+ //printf("SVFilter::filterout\n"); | |
+#if 0 | |
for(int i = 0; i < stages + 1; ++i) | |
singlefilterout(smp, st[i], par); | |
@@ -227,6 +236,15 @@ void SVFilter::filterout(float *smp) | |
} | |
needsinterpolation = false; | |
} | |
+#endif | |
+ if(needsinterpolation) { | |
+ //printf("interpolating...\n"); | |
+ for(int i = 0; i < stages + 1; ++i) | |
+ singlefilterout(smp, st[i], ipar, par); | |
+ needsinterpolation = false; | |
+ } else | |
+ for(int i = 0; i < stages + 1; ++i) | |
+ singlefilterout(smp, st[i], par, par); | |
for(int i = 0; i < buffersize; ++i) | |
smp[i] *= outgain; | |
diff --git a/src/DSP/SVFilter.h b/src/DSP/SVFilter.h | |
index 7cb7e989..57e82494 100644 | |
--- a/src/DSP/SVFilter.h | |
+++ b/src/DSP/SVFilter.h | |
@@ -56,7 +56,7 @@ class SVFilter:public Filter | |
float f, q, q_sqrt; | |
} par, ipar; | |
- void singlefilterout(float *smp, fstage &x, parameters &par); | |
+ void singlefilterout(float *smp, fstage &x, parameters &par, parameters &); | |
void computefiltercoefs(void); | |
int type; // The type of the filter (LPF1,HPF1,LPF2,HPF2...) | |
int stages; // how many times the filter is applied (0->1,1->2,etc.) |
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