if (filt_mode == FF_FILTER_MODE_HIGHPASS) {
c->gain = ((1.0 + cos_w0) / 2.0) / a0;
- x0 = (-(1.0 + cos_w0)) / a0;
- x1 = ((1.0 + cos_w0) / 2.0) / a0;
+ x0 = ((1.0 + cos_w0) / 2.0) / a0;
+ x1 = (-(1.0 + cos_w0)) / a0;
} else { // FF_FILTER_MODE_LOWPASS
c->gain = ((1.0 - cos_w0) / 2.0) / a0;
- x0 = (1.0 - cos_w0) / a0;
- x1 = ((1.0 - cos_w0) / 2.0) / a0;
+ x0 = ((1.0 - cos_w0) / 2.0) / a0;
+ x1 = (1.0 - cos_w0) / a0;
}
- c->cy[0] = (2.0 * cos_w0) / a0;
- c->cy[1] = (-1.0 + (sin_w0 / 2.0)) / a0;
+ c->cy[0] = (-1.0 + (sin_w0 / 2.0)) / a0;
+ c->cy[1] = (2.0 * cos_w0) / a0;
// divide by gain to make the x coeffs integers.
// during filtering, the delay state will include the gain multiplication