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2007
Conference Paper
Titel
Blind one-to-n upmixing
Abstract
Recently, a novel method for the extraction of an ambience signal using Non-negative Matrix Factorization for ambience-based blind upmixing of one-channel audio signals has been proposed. This paper investigates how to improve the overall subjective quality of the surround presentation by applying suitable post-processing techniques. The basic requirements for the upmixed multi-channel signal are formulated and appropriate audio signal processing methods are proposed. This includes signal adaptive equalization, transient suppression and signal decorrelation. Listening tests confirm the listeners' preference of the post-processed upmix compared to unprocessed audio and previous upmix algorithms when played back on a 5.0 system.