Bon, la détection de volume commence à ressembler à qque chose mais les valeurs semblent pas forcément bonnes. Le filtre A n'est pas appliqué encore.

Dans le test6, quelques essais de maths...


git-svn-id: file:///var/svn/2012-violon-leds/trunk@14 6be1fa4d-33ac-4c33-becc-79fcb3794bb6

3 files changed, 53 insertions, 0 deletions

diff --git a/tests/test6/compil.sh b/tests/test6/compil.sh
new file mode 100755
index 0000000..4ac3ca3
--- /dev/null
+++ b/tests/test6/compil.sh
@@ -0,0 +1 @@
+gcc -Wall -g -o test6 test6.c -lm
diff --git a/tests/test6/octave1.txt b/tests/test6/octave1.txt
new file mode 100644
index 0000000..616628f
--- /dev/null
+++ b/tests/test6/octave1.txt
@@ -0,0 +1,16 @@
+function s=son_pur(f,v,d,sr)
+	n = 1:(d*sr);
+	s = v*sin(2.*pi.*f*n/sr);
+endfunction
+
+sr=8000;
+f=440;
+d=1;
+v=0.9;
+
+s=son_pur(f,v,d,sr);
+[y,c]=stft(s,128);
+c
+s2=synthesis(y,c);
+sound(s2);
+
diff --git a/tests/test6/test6.c b/tests/test6/test6.c
new file mode 100644
index 0000000..fc99598
--- /dev/null
+++ b/tests/test6/test6.c
@@ -0,0 +1,36 @@
+#include <math.h>
+#include <stdio.h>
+
+//#if 1 //(UGLY_IEEE754_FLOAT32_HACK :-)
+/*
+static inline float todB_a(const float *x){
+	return (float)((*(int *)x)&0x7fffffff) * 7.17711438e-7f -764.6161886f;
+}
+*/
+static inline float todB_a(const float *x){
+	union {
+		//int32_t i;
+		int i;
+		float f;
+	} ix;
+	ix.f = *x;
+	ix.i = ix.i&0x7fffffff;
+	return (float)(ix.i * 7.17711438e-7f -764.6161886f);
+}
+//#else
+
+static inline float todB_a2(const float *x){
+	return (*(x)==0?-400.f:logf(*(x)**(x))*4.34294480f);
+}
+
+//#endif
+
+int main() {
+	float f;
+
+	for(f=1.f;f<100000000.f;f*=1.2f)
+		printf("%f\t%f\n", todB_a(&f), todB_a2(&f));
+
+	return 0;
+}
+