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Spatial Decomposition of Time-frequency Regions: Subbands or Sinusoids

Techniques where a stereo or a multichannel signal is decomposed into spatial source-labeled time-frequency slots by level, time-dierence, and coherence metrics have become popular in recent years. Good examples are binaural cue coding and up/downmixing techniques. In the article, we will provide an overview and discuss parallel approaches in the field of array processing and blind source separation. Typically, timefrequency slots are formed from subband representations of signals. However, it is also possible to produce a similar spatial decomposition for a parametric representation (sinusoids, transients, and noise) of a stereo or multichannel audio signal. Advantages and disadvantages of the two approaches for audio coding applications are discussed in this article.