In a multichannel spatial audio presentation, a decorrelator is a signal-processing algorithm that helps to create a diffuse sensation for the listener by defeating any localization cues. In this paper the relevant psychoacoustic and signal processing principles are reviewed, and a new decorrelator algorithm is proposed that operates blindly on a single-channel input signal and creates a 5-channel decorrelated presentation. This algorithm uses transient extraction to achieve better fidelity when decorrelating a wide range of input signals. A subjective listening test compares the performance of the proposed algorithm in relation to two existing algorithms drawn from the literature. Results of the test are discussed as well as suggested improvements to the test methodology.
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