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turns out wikipedia just flat out give you a code for LP/HP filter

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minjaesong
2023-11-19 20:34:40 +09:00
parent 04144fff08
commit 7b7f19e218
1 changed files with 3 additions and 3 deletions
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6
src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
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@@ -57,7 +57,7 @@ class Lowpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
out[0] = outbuf0[ch].last() out[0] = outbuf0[ch].last()
for (i in 1 until outbuf1[ch].size) { for (i in 1 until outbuf1[ch].size) {
out[i] = out[i-1] + (alpha * (inn[i] - out[i-1])) out[i] = out[i-1] + alpha * (inn[i] - out[i-1])
} }
} }
} }
@@ -86,7 +86,7 @@ class Highpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
// println("LP Cutoff: $cutoff") // println("LP Cutoff: $cutoff")
val RC: Double = 1.0 / (cutoff * Math.PI * 2.0) val RC: Double = 1.0 / (cutoff * Math.PI * 2.0)
val dt: Double = 1.0 / rate val dt: Double = 1.0 / rate
alpha = (dt / (RC + dt)).toFloat() alpha = (RC / (RC + dt)).toFloat()
this.cutoff = cutoff this.cutoff = cutoff
} }
@@ -98,7 +98,7 @@ class Highpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
out[0] = outbuf0[ch].last() out[0] = outbuf0[ch].last()
for (i in 1 until outbuf1[ch].size) { for (i in 1 until outbuf1[ch].size) {
out[i] = inn[i] - inn[i-1] + (alpha * out[i-1]) // this actually works but setCutoff need to be changed out[i] = alpha * (out[i-1] + inn[i] - inn[i-1])
} }
} }
} }