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feat: implement bell filter unit for equalizing

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This commit is contained in:
5684185+vsariola@users.noreply.github.com
2025-12-28 18:08:12 +02:00
parent 33ee80a908
commit 4d09e04a49
13 changed files with 245 additions and 29 deletions
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23
patch.go
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@ -206,6 +206,11 @@ var UnitTypes = map[string]([]UnitParameter){
{Name: "stereo", MinValue: 0, MaxValue: 1, CanSet: true, CanModulate: false},
{Name: "channel", MinValue: 0, MaxValue: 6, CanSet: true, CanModulate: false, DisplayFunc: arrDispFunc(channelNames[:])}},
"sync": []UnitParameter{},
"belleq": []UnitParameter{
{Name: "stereo", MinValue: 0, MaxValue: 1, CanSet: true, CanModulate: false},
{Name: "frequency", MinValue: 0, MaxValue: 128, CanSet: true, CanModulate: true, DisplayFunc: func(v int) (string, string) { return belleqFrequencyDisplay(v) }},
{Name: "bandwidth", MinValue: 0, MaxValue: 128, CanSet: true, CanModulate: true, DisplayFunc: func(v int) (string, string) { return belleqBandwidthDisplay(v) }},
{Name: "gain", MinValue: 0, Neutral: 64, MaxValue: 128, CanSet: true, CanModulate: true, DisplayFunc: func(v int) (string, string) { return belleqGainDisplay(v) }}},
}
// compile errors if interface is not implemented.
@ -266,6 +271,23 @@ func filterFrequencyDispFunc(v int) (string, string) {
return strconv.FormatFloat(f, 'f', 0, 64), "Hz"
}
func belleqFrequencyDisplay(v int) (string, string) {
freq := float64(v) / 128
p := 2 * freq * freq
f := 44100 * p / math.Pi / 2
return strconv.FormatFloat(f, 'f', 0, 64), "Hz"
}
func belleqBandwidthDisplay(v int) (string, string) {
p := float64(v) / 128
Q := 1 / (4 * p)
return strconv.FormatFloat(Q, 'f', 2, 64), "Q"
}
func belleqGainDisplay(v int) (string, string) {
return strconv.FormatFloat(40*(float64(v)/64-1), 'f', 2, 64), "dB"
}
func compressorTimeDispFunc(v int) (string, string) {
alpha := math.Pow(2, -24*float64(v)/128) // alpha is the "smoothing factor" of first order low pass iir
sec := -1 / (44100 * math.Log(1-alpha)) // from smoothing factor to time constant, https://en.wikipedia.org/wiki/Exponential_smoothing
@ -435,6 +457,7 @@ var stackUseMonoStereo = map[string][2]StackUse{
{Inputs: [][]int{{0}}, Modifies: []bool{false}, NumOutputs: 1},
{},
},
"belleq": stackUseEffect,
}
var stackUseSendNoPop = [2]StackUse{
{Inputs: [][]int{{0}}, Modifies: []bool{true}, NumOutputs: 1},