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flat-top fft window for spectrogram

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minjaesong
2023-12-23 00:16:27 +09:00
parent 397b4f7717
commit b5312da2f0
1 changed files with 9 additions and 1 deletions
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10
src/net/torvald/terrarum/audio/dsp/Scope.kt
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@@ -26,7 +26,15 @@ class Scope : TerrarumAudioFilter() {
private val chsum = ComplexArray(FloatArray(2*FFTSIZE))
private val fftOut = ComplexArray(FloatArray(2*FFTSIZE))
private val fftWin = FloatArray(FFTSIZE) { sin2(PI * it / FFTSIZE).toFloat() }
// private val fftWin = FloatArray(FFTSIZE) { sin2(PI * it / FFTSIZE).toFloat() } // hann
private val a0 = 0.21557895
private val a1 = 0.41663158
private val a2 = 0.277263158
private val a3 = 0.083578947
private val a4 = 0.006947368
private val FT = PI / FFTSIZE
private val fftWin = FloatArray(FFTSIZE) { (a0 - a1*cos(2*it*FT) + a2*cos(4*it*FT) - a3*cos(6*it*FT) + a4*cos(8*it*FT)).toFloat() } // flat-top
private val sqrt2p = 0.7071067811865475