Decorrelation enables creating independent channels while preserving perceptual quality.

Evidence

Decorrelation is a method for processing a signal so that its ICC ≈0 with respect to the original signal as well as with respect to the processed signals from other decorrelators. Ideally, a decorrelator is designed such that the perceptual characteristics of the sound are least affected. Decorrelation is necessary for applications that increase the number of independent channels, such as upmixing or surround sound rendered from a few microphone signals. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 2150

Categorization

• DEFINE: Defines decorrelation and ties it to the concrete upmixing/surround use case.