Timing optimization of filter replacement in compressive coding for stereo audio signals using independent component analysis

In this paper we propose a timing optimization of the filter replacement in compressive coding method of stereo audio signals using independent component analysis (ICA). We previously proposed a novel compressive coding method of stereo audio signals using ICA as a coding technique of high sound quality and low bit rate. However, the sound quality degrades if we do not replace separation filter in time for changing composition of the musical instruments. Therefore we newly propose the optimization algorithm of timing to replace the separation filter, and experimental results show our algorithm can provide the best timing to replace the filter with less computations.