diff options
Diffstat (limited to 'src/libfilter/iir_filter.c')
| -rw-r--r-- | src/libfilter/iir_filter.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/src/libfilter/iir_filter.c b/src/libfilter/iir_filter.c index 5872d61..2749f96 100644 --- a/src/libfilter/iir_filter.c +++ b/src/libfilter/iir_filter.c @@ -88,13 +88,12 @@ void iir_bandpass_init(iir_filter_t *filter, double frequency, int samplerate, i filter->b2 = (1 - K / Q + K * K) * norm; } -void iir_notch_init(iir_filter_t *filter, double frequency, int samplerate, int iterations) +void iir_notch_init(iir_filter_t *filter, double frequency, int samplerate, int iterations, double Q) { - double Fc, Q, K, norm; + double Fc, K, norm; memset(filter, 0, sizeof(*filter)); filter->iter = iterations; - Q = pow(sqrt(0.5), 1.0 / (double)iterations); /* 0.7071 @ 1 iteration */ Fc = frequency / (double)samplerate; K = tan(PI * Fc); norm = 1 / (1 + K / Q + K * K); |