fix(Spectrum): copy data in harmonic product estimation #375
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The code in `harmonic_product_spectrum` was unexpectedly changing the spectrum array data, because numpy operates on views rather than copies. In turn, this was breaking the low-frequency bins of the FFT spectrum. Here we fix it by taking a copy of the numpy slice.
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The code in
harmonic_product_spectrumwas unexpectedly changing the spectrum array data, because numpy operates on views rather than copies. In turn, this was breaking the low-frequency bins of the FFT spectrum.Here we fix it by directly multiplying the views.
The original error is mine, introduced in #266.
Fixes #319