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| = CEFT =
| | #REDIRECT [[Constrained-Energy_Fourier_Transforms]] |
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| == Problems with current implementation and possible solutions ==
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| === Overlapped FFT not critically sampled ===
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| Ideas:
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| * Use an MDCT instead of the FFT
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| * Do extrapolation on the input and use a wider FFT. Then optimise the search only for the "real" samples
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| === Non-harmonic signals (i.e. music) ===
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| Ideas:
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| * Sinusoidal prediction
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| * Use two (or more) pitch periods and choose one for each bin/band/whatever
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| * Use two (or more) pitch periods at the same time and use energy conservation to keep everything stable.
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| === Sparse spectrum ===
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| Ideas:
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| * Use a "rotation matrix"
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| * Prediction from lower frequencies
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