  Decomposition of an audio mixture into harmonic and percussive components,
namely harmonic/percussive source separation (HPSS), is a useful pre-processing
tool for many audio applications. Popular approaches to HPSS exploit the
distinctive source-specific structures of power spectrograms. However, such
approaches consider only power spectrograms, and the phase remains intact for
resynthesizing the separated signals. In this paper, we propose a phase-aware
HPSS method based on the structure of the phase of harmonic components. It is
formulated as a convex optimization problem in the time domain, which enables
the simultaneous treatment of both amplitude and phase. The numerical
experiment validates the effectiveness of the proposed method.
