In this paper four combinations of perceptual models and transform coding systems are implemented and compared. The first of the two perceptual models is based on a DFT with a uniform frequency resolution. The second model uses IIR filters designed in accordance with the temporal/spectral resolution of the auditory system. Both of the two transform coding systems use a uniform spectral decomposition (MDCT). While in the first system the quantizers are directly controlled by the perceptual model, the second system uses a pre- and post-filter with frequency warping for shaping the quantization noise with a temporal/spectral resolution more adapted to the auditory system. Implementation details are given and results of subjective tests are presented.
Edler, Bernd; Knölke, Nicole; Ostermann, Jörn; Taghipour, Armin
Affiliation: University of Hannover, Hannover, Germany
AES Convention: 129 (November 2010) Paper Number: 8283
Publication Date: November 4, 2010
Subject: Low-Bit-Rate Audio Coding
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