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update for filter coefficient

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Seems that I made a small mistake when calculating cut-off frequencies. Updated values make more sense.
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Frank
2022-11-18 12:55:53 +01:00
parent 181f8c546b
commit dce3b04695
1 changed files with 5 additions and 4 deletions
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9
usermods/audioreactive/audio_reactive.h
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@@ -285,10 +285,11 @@ void FFTcode(void * parameter)
// band pass filter - can reduce noise floor by a factor of 50 // band pass filter - can reduce noise floor by a factor of 50
// downside: frequencies below 100Hz will be ignored // downside: frequencies below 100Hz will be ignored
if (useBandPassFilter) { if (useBandPassFilter) {
// low frequency cutoff parameter // low frequency cutoff parameter - see https://dsp.stackexchange.com/questions/40462/exponential-moving-average-cut-off-frequency
//constexpr float alpha = 0.04f; // 100hz //constexpr float alpha = 0.04f; // 150Hz
constexpr float alpha = 0.03f; // 80hz //constexpr float alpha = 0.03f; // 110Hz
//constexpr float alpha = 0.0225f; // 60hz constexpr float alpha = 0.0225f; // 80hz
//constexpr float alpha = 0.01693f;// 60hz
// high frequency cutoff parameter // high frequency cutoff parameter
//constexpr float beta1 = 0.75; // 11Khz //constexpr float beta1 = 0.75; // 11Khz
//constexpr float beta1 = 0.82; // 15Khz //constexpr float beta1 = 0.82; // 15Khz