Parametric Stereo (PS) coding describes stereo audio signal with a monaural signal and a set of spatial parameters.This paper describes a signal-dependant, subband-domain downmixing scheme for PS encoder to obtain themonaural signal. The downmixing is performed on the subband signal output from PS analysis filtering, hence noextra signal decomposition is required. The scheme is able to minimize phase cancellation by performing phasealignment of the stereo signals prior to the mixing. In addition, power equalization ensures preservation of theoverall power of the original stereo signal in the monaural downmixed signal. Additional computational requirementcan be kept low by making use of the available PS spatial parameter data for the phase alignment. Testing onsynthetic and real-life audio recording shows a good performance especially for audio recording with significantout-of-phase side signal component.
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