sydney/EqualizerAPO
1
0 Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Improved: Shelving filters (LS(C), HS(C)) can now also use Q instead of slope.

Browse Source
This commit is contained in:
jthedering committed 2019-06-09 18:26:52 +00:00
1 parent 916eab4528
commit a7fc5de925
7 files changed
+91 -53
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

filters/BiQuad.cpp
+8 -10
View File
@@ -22,7 +22,7 @@
using namespace std;
BiQuad::BiQuad(Type type, double dbGain, double freq, double srate, double bandwidthOrQOrS, bool isBandwidth)
BiQuad::BiQuad(Type type, double dbGain, double freq, double srate, double bandwidthOrQOrS, bool isBandwidthOrS)
{
double A;
if (type == PEAKING || type == LOW_SHELF || type == HIGH_SHELF)
@@ -33,17 +33,15 @@ BiQuad::BiQuad(Type type, double dbGain, double freq, double srate, double bandw
double sn = sin(omega);
double cs = cos(omega);
double alpha;
double beta = -1;
if (type == LOW_SHELF || type == HIGH_SHELF) // S
{
alpha = sn / 2 * sqrt((A + 1 / A) * (1 / bandwidthOrQOrS - 1) + 2);
beta = 2 * sqrt(A) * alpha;
}
else if (isBandwidth) // BW
alpha = sn * sinh(M_LN2 / 2 * bandwidthOrQOrS * omega / sn);
else // Q
if (!isBandwidthOrS) // Q
alpha = sn / (2 * bandwidthOrQOrS);
else if (type == LOW_SHELF || type == HIGH_SHELF) // S
alpha = sn / 2 * sqrt((A + 1 / A) * (1 / bandwidthOrQOrS - 1) + 2);
else // BW
alpha = sn * sinh(M_LN2 / 2 * bandwidthOrQOrS * omega / sn);
double beta = 2 * sqrt(A) * alpha;
double b0, b1, b2, a0, a1, a2;