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examples/piano: Refactoring

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This commit is contained in:
Hajime Hoshi 2018-01-08 22:44:15 +09:00
parent b30703eb00
commit 2dab8ccc6e
1 changed files with 2 additions and 5 deletions
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7
examples/piano/main.go
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@ -49,16 +49,13 @@ var pcm = make([]float64, 4*sampleRate)
const baseFreq = 220 const baseFreq = 220
func init() { func init() {
const twoPiF = 2.0 * math.Pi * baseFreq
s := float64(sampleRate)
amp := []float64{1.0, 0.8, 0.6, 0.4, 0.2} amp := []float64{1.0, 0.8, 0.6, 0.4, 0.2}
x := []float64{4.0, 2.0, 1.0, 0.5, 0.25} x := []float64{4.0, 2.0, 1.0, 0.5, 0.25}
for i := 0; i < len(pcm); i++ { for i := 0; i < len(pcm); i++ {
v := 0.0 v := 0.0
for j := 0; j < len(amp); j++ { for j := 0; j < len(amp); j++ {
a := amp[j] * math.Exp(-5*float64(i)/(x[j]*s)) a := amp[j] * math.Exp(-5*float64(i)/(x[j]*sampleRate))
v += a * math.Sin(float64(i)*twoPiF*float64(j+1)/s) v += a * math.Sin(2.0*math.Pi*float64(i)*baseFreq*float64(j+1)/sampleRate)
} }
pcm[i] = v / 5.0 pcm[i] = v / 5.0
} }