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Open Access

A Perceptual Model for Sinusoidal Audio Coding Based on Spectral Integration

  • Steven van de Par1Email author,
  • Armin Kohlrausch1, 2,
  • Richard Heusdens3,
  • Jesper Jensen3 and
  • Søren Holdt Jensen4
EURASIP Journal on Advances in Signal Processing20052005:317529

https://doi.org/10.1155/ASP.2005.1292

Received: 31 October 2003

Published: 21 June 2005

Abstract

Psychoacoustical models have been used extensively within audio coding applications over the past decades. Recently, parametric coding techniques have been applied to general audio and this has created the need for a psychoacoustical model that is specifically suited for sinusoidal modelling of audio signals. In this paper, we present a new perceptual model that predicts masked thresholds for sinusoidal distortions. The model relies on signal detection theory and incorporates more recent insights about spectral and temporal integration in auditory masking. As a consequence, the model is able to predict the distortion detectability. In fact, the distortion detectability defines a (perceptually relevant) norm on the underlying signal space which is beneficial for optimisation algorithms such as rate-distortion optimisation or linear predictive coding. We evaluate the merits of the model by combining it with a sinusoidal extraction method and compare the results with those obtained with the ISO MPEG-1 Layer I-II recommended model. Listening tests show a clear preference for the new model. More specifically, the model presented here leads to a reduction of more than 20% in terms of number of sinusoids needed to represent signals at a given quality level.

Keywords and phrases

audio codingpsychoacoustical modellingauditory maskingspectral maskingsinusoidal modellingpsychoacoustical matching pursuit

Authors’ Affiliations

(1)
Digital Signal Processing Group, Philips Research Laboratories, Eindhoven, The Netherlands
(2)
Department of Technology Management, Eindhoven University of Technology, Eindhoven, The Netherlands
(3)
Department of Mediamatics, Delft University of Technology, Delft, The Netherlands
(4)
Department of Communication Technology, Institute of Electronic Systems, Aalborg University, Aalborg, Denmark

Copyright

© Steven van de Par et al. 2005

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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