add chapter04#64
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再構成誤差 物理量 |
i14kwmr
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Jul 23, 2023
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| X = stft(x, L, S, w) | ||
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| # プロット |
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i14kwmr
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Jul 23, 2023
| return w_synth | ||
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| # 確認 |
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コメント：
確認コードがあって良いと思います！
網羅的に確認するときは、ytakeuchiくんの確認コード(url)が参考になるかもです！
i14kwmr
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Jul 23, 2023
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| # 合成窓 | ||
| def window_synth(w, L, S): |
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細かいですが、演習問題としては、関数の入力は「シフト幅S」と「L点の窓関数」の2つを意図していました！その場合ですが、Lは関数内でlen(w)とかを用いて取得する感じになるかと！
i14kwmr
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Jul 25, 2023
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| x_pad = zero_pad(x, L, S) | ||
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| # 再構成誤差 |
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再構成誤差の計算についてですが、np.sum(x_pad - x_istft) ** 2ではなく、np.sum((x_pad - x_istft) ** 2)にする必要があるかと！x_pad - x_istftだと、誤差が大きかった場合でも正負の関係で打ち消しが起こってしまって誤差が小さく出てしまうことがあります
例えば、信号の誤差が[-10, 10, -10, 10]の場合、
np.sum(x_pad - x_istft) ** 2=0np.sum((x_pad - x_istft) ** 2)=400
となります
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