Predictive Audio Coding Using Rate-Distortion-Optimal Pre-and-Post-Filtering
2011 (English)In: Applications of Signal Processing to Audio and Acoustics (WASPAA), 2011 IEEE Workshop on, IEEE conference proceedings, 2011, 213-216 p.Conference paper (Refereed)
A natural approach to audio coding is to use a rate-distortion optimal design combined with a perceptual model. While this approach is common in transform coding, existing predictive-coding based audio coders are generally not optimal and they benefit from heuristically motivated post-filtering. As delay requirements often force the use of predictive coding, we consider audio coding with a pre- and post-filtered predictive structure that was recently proven to be asymptotically optimal in the rate-distortion sense . We show that this audio coding is efficient in achieving the state-of-the-art performance. We also show that the pre-filter plays a relatively minor role. This leads to an analytic approach for optimizing the post-filter and the predictor at each rate, eliminating the need for manual re-tuning whenever a different rate is called for. In a subjective test, the theoretically optimized post-filter provided a better performance than a conventional post-filter.
Place, publisher, year, edition, pages
IEEE conference proceedings, 2011. 213-216 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-52712DOI: 10.1109/ASPAA.2011.6082345ISI: 000298302900054ScopusID: 2-s2.0-83455255659OAI: oai:DiVA.org:kth-52712DiVA: diva2:467508
2011 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, WASPAA 2011, New Paltz, NY, October, 16-19, 2011
QC 201201032011-12-192011-12-192012-04-03Bibliographically approved