Abstract / truncated to 115 words (read the full abstract)

Filterbanks are an integral part of most perceptual coder systems, tasked with shaping the noise produced by the quantizer in the en- coder. Because of this shaping, the quantizer noise can then be con- trolled to stay below the masking threshold of the human ear, and become inaudible. In most current perceptual coders, an unmodified MDCT is used as the filterbank, as the MDCT has many properties that make it a good choice for this scenario. One disadvantage, however, is the uniform time-frequency reso- lution of the MDCT. This stands in contrast to the human auditory system, which has a non-uniform time-frequency resolution. This mis- match results in an unexploited gap that, if closed, could ... toggle 4 keywords

audio coding – filterbanks – MDCT – non-uniform filterbanks

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