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The Transient Steering Decorrelator Tool in the Upcoming MPEG Unified Speech and Audio Coding Standard

Applause signals are still challenging to code with good perceptual quality using parametric multichannel audio coding techniques. To improve the codec performance for these particular items, the Transient Steering Decorrelator (TSD) tool has been adopted into the upcoming Moving Picture Experts Group (MPEG) standard on Unified Speech and Audio Coding (USAC) as an amendement to the MPEG Surround 2-1-2 module (MPS). TSD improves the perceptual quality of signals which contain rather dense spatially distributed transient auditory events like in applause type of signals. Within TSD, transient events are separated from the core decoder output and a dedicated decorrelator algorithm distributes the transients in the spatial image according to parametric guiding information transmitted in the bitstream. Listening tests show a substantial improvement in subjective quality.

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