Existing schemes for stereo and spatial audio coding rely on psychoacoustically-relevant parametric models. These systems generally encode and transmit inter-channel intensity, coherence and phase parameters extracted from a time-frequency plane. Building on this framework, we discuss a number of potential refinements that can improve the quality or reduce the bit-rate of these existing schemes using information already transmitted to the decoder. We also evaluate and assert the performance of these enhancements with a distortion analysis of the relevant parameters.
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