diff --git a/main.go b/main.go
index 309fe8f..bf348f0 100644
--- a/main.go
+++ b/main.go
@@ -101,7 +101,7 @@ func (g *Game) Draw(screen *ebiten.Image) {
 			binary.Read(audio.SampleRingBuffer, binary.NativeEndian, &AX)
 			binary.Read(audio.SampleRingBuffer, binary.NativeEndian, &AY)
 		}
-		FFTBuffer = window.Apply(FFTBuffer, signalprocessing.HannWindow)
+		FFTBuffer = window.Apply(FFTBuffer, signalprocessing.CachedWindowFunction)
 		X := fft.FFTReal(FFTBuffer)
 		r, θ := cmplx.Polar(X[1])
 		maxR := r
diff --git a/signalprocessing/signalprocessing.go b/signalprocessing/signalprocessing.go
index 1c98bb1..5f171ac 100644
--- a/signalprocessing/signalprocessing.go
+++ b/signalprocessing/signalprocessing.go
@@ -12,3 +12,7 @@ var HannWindow []float64
 func Init() {
 	HannWindow = window.Hann(int(config.Config.ReadBufferSize / audio.SampleSizeInBytes / 2))
 }
+
+func CachedWindowFunction(u int) []float64 {
+	return HannWindow
+}