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return beep.Streamer and rename some vars

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This commit is contained in:
Craig Swank
2021-06-22 08:45:03 -06:00
parent b913b006cd
commit 0a977a2d5e
1 changed files with 12 additions and 12 deletions
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24
effects/equalizer.go
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@@ -13,7 +13,7 @@ type (
xPast, yPast [][2]float64
}
Section struct {
EqualizerSection struct {
F0, Bf, GB, G0, G float64
}
@@ -72,27 +72,27 @@ func (s *section) apply(x [][2]float64) [][2]float64 {
return y
}
func NewEqualizer(s beep.Streamer, fs float64, filters []Section) *Equalizer {
func NewEqualizer(s beep.Streamer, fs float64, sections []EqualizerSection) beep.Streamer {
out := &Equalizer{
streamer: s,
}
for _, f := range filters {
beta := math.Tan(f.Bf/2.0*math.Pi/(fs/2.0)) *
math.Sqrt(math.Abs(math.Pow(math.Pow(10, f.GB/20.0), 2.0)-
math.Pow(math.Pow(10.0, f.G0/20.0), 2.0))) /
math.Sqrt(math.Abs(math.Pow(math.Pow(10.0, f.G/20.0), 2.0)-
math.Pow(math.Pow(10.0, f.GB/20.0), 2.0)))
for _, s := range sections {
beta := math.Tan(s.Bf/2.0*math.Pi/(fs/2.0)) *
math.Sqrt(math.Abs(math.Pow(math.Pow(10, s.GB/20.0), 2.0)-
math.Pow(math.Pow(10.0, s.G0/20.0), 2.0))) /
math.Sqrt(math.Abs(math.Pow(math.Pow(10.0, s.G/20.0), 2.0)-
math.Pow(math.Pow(10.0, s.GB/20.0), 2.0)))
b := []float64{
(math.Pow(10.0, f.G0/20.0) + math.Pow(10.0, f.G/20.0)*beta) / (1 + beta),
(-2 * math.Pow(10.0, f.G0/20.0) * math.Cos(f.F0*math.Pi/(fs/2.0))) / (1 + beta),
(math.Pow(10.0, f.G0/20) - math.Pow(10.0, f.G/20.0)*beta) / (1 + beta),
(math.Pow(10.0, s.G0/20.0) + math.Pow(10.0, s.G/20.0)*beta) / (1 + beta),
(-2 * math.Pow(10.0, s.G0/20.0) * math.Cos(s.F0*math.Pi/(fs/2.0))) / (1 + beta),
(math.Pow(10.0, s.G0/20) - math.Pow(10.0, s.G/20.0)*beta) / (1 + beta),
}
a := []float64{
1.0,
-2 * math.Cos(f.F0*math.Pi/(fs/2.0)) / (1 + beta),
-2 * math.Cos(s.F0*math.Pi/(fs/2.0)) / (1 + beta),
(1 - beta) / (1 + beta),
}
out.sections = append(out.sections, section{a: a, b: b})