A Comparison of Audio Signal Preprocessing Methods for Deep Neural Networks on Music Tagging. Choi, K., Fazekas, G., Sandler, M., & Cho, K. In 2018 26th European Signal Processing Conference (EUSIPCO), pages 1870-1874, Sep., 2018.
A Comparison of Audio Signal Preprocessing Methods for Deep Neural Networks on Music Tagging [pdf]Paper  doi  abstract   bibtex   
In this paper, we empirically investigate the effect of audio preprocessing on music tagging with deep neural networks. We perform comprehensive experiments involving audio preprocessing using different time-frequency representations, logarithmic magnitude compression, frequency weighting, and scaling. We show that many commonly used input preprocessing techniques are redundant except magnitude compression.

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