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partitioned fft wip

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minjaesong
2023-11-25 23:31:54 +09:00
parent 1ed6f252db
commit 4d85d91478
2 changed files with 33 additions and 7 deletions
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12
src/net/torvald/terrarum/audio/FFT.kt
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@@ -5,10 +5,10 @@ import org.apache.commons.math3.transform.DftNormalization
import org.apache.commons.math3.transform.TransformType
import org.apache.commons.math3.util.FastMath
data class FComplex(var real: Float = 0f, var imaginary: Float = 0f) {
data class FComplex(var re: Float = 0f, var im: Float = 0f) {
operator fun times(other: FComplex) = FComplex(
this.real * other.real - this.imaginary * other.imaginary,
this.real * other.imaginary + this.imaginary * other.real
this.re * other.re - this.im * other.im,
this.re * other.im + this.im * other.re
)
}
@@ -34,8 +34,8 @@ object FFT {
fun ifftAndGetReal(y: Array<FComplex>): FloatArray {
val dataRI = Array<FloatArray>(2) { FloatArray(y.size) }
for (i in y.indices) {
dataRI[0][i] = y[i].real
dataRI[1][i] = y[i].imaginary
dataRI[0][i] = y[i].re
dataRI[1][i] = y[i].im
}
transformInPlace(dataRI, DftNormalization.STANDARD, TransformType.INVERSE)
@@ -112,8 +112,6 @@ object FFT {
bitReversalShuffle2(dataR, dataI)
// Do 4-term DFT.
// Do 4-term DFT.
if (type == TransformType.INVERSE) {
var i0 = 0