Improving DNN-based Music Source Separation using Phase Features
This work addresses music source separation for audio processing applications, but it is incremental as it builds on existing DNN methods by adding phase features.
The paper tackled music source separation by incorporating phase features alongside amplitude in DNNs, achieving improved signal-to-distortion ratios on the DSD100 dataset for all instruments, with notable gains for bass.
Music source separation with deep neural networks typically relies only on amplitude features. In this paper we show that additional phase features can improve the separation performance. Using the theoretical relationship between STFT phase and amplitude, we conjecture that derivatives of the phase are a good feature representation opposed to the raw phase. We verify this conjecture experimentally and propose a new DNN architecture which combines amplitude and phase. This joint approach achieves a better signal-to distortion ratio on the DSD100 dataset for all instruments compared to a network that uses only amplitude features. Especially, the bass instrument benefits from the phase information.