Multichannel audio can immerse a group of listeners in a seamless aural environment. However, several issues must be addressed, such as the excessive transmission requirements of multichannel audio, as well as the fact that to-date only a handful of music recordings have been made with multiple channels. Previously, we proposed a system capable of synthesizing the multiple channels of a virtual multichannel recording from a smaller set of reference recordings. In this paper these methods are extended to provide a more general coverage of the problem. The emphasis here is on time-varying filtering techniques that can be used to enhance particular instruments in the recording, which is desired in order to simulate virtual microphones in several locations close and around the sound source.
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