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julia-nmf-ss-toy

二乗誤差基準のNMFをシングルトラックの音源分離に適応する例です。昔の自分が 実装してみると書いていた ので、気分転換に書いてみました。

大したもんではないですが、必要なコード(NMF、短時間フーリエ変換/逆短時間フーリエ変換)と、IJuliaのノートブックを置いておきます。

ノート

NMF-based Music Source Separation Demo.ipynb | nbviewer

サンプル

ノートに書いたコードから可視化部分を抜くと、こうなります

include("stft.jl")
include("nmf.jl")

using WAV

x, fs = wavread("test10k.wav")
@assert fs == 10000

x = vec(x)

framelen = 512
hopsize = div(framelen, 2)
X = stft(x, framelen, hopsize)

Y, phase = abs(X), angle(X)

# perform NMF on spectrogram
K = 4
srand(98765)
@time H, U = nmf_euc(Y, K)

for k=1:K
    y = istft(H[:,k]*U[k,:] .* exp(im * phase), framelen, hopsize)
    wavwrite(float16(y), string(k, ".wav"), Fs=fs)
end

example.jl として置いてあります。

julia example.jl

として実行してみてください。音源分離の結果がwavファイルとして書きだされます。

ライセンス

MIT

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