Details
| Original language | English |
|---|---|
| Title of host publication | 2015 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics |
| Subtitle of host publication | WASPAA 2015 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| ISBN (electronic) | 9781479974504 |
| Publication status | Published - Nov 2015 |
| Event | IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, WASPAA 2015 - New Paltz, United States Duration: 18 Oct 2015 → 21 Oct 2015 |
Abstract
This paper addresses the combination of a low delay subband ADPCM-based audio codec with adaptive pre- and post-filtering for psychoacoustic noise shaping. We present how our basic scheme for error robust subband coding can be combined with two cascades of band shelving filters. The gain parameters of these filters are adapted by an algorithm that is based on power estimates which are obtained from the bandpass filtered subband signals of the codec. Since the subband coding as well as the adaptive pre- and post-filtering include several partially interacting parameters that are hard to adjust manually, a framework for their psychoacoustic controlled global optimization is presented. Experiments and their results show that the combination of our low delay subband ADPCM-based audio codec with adaptive pre-and post-filtering allows for a significant improvement of audio quality without any additional signaling overhead. Furthermore, the global optimization enables finding a psychoacoustical meaningful operating point.
Keywords
- Adaptive pre- and post-filtering, global parameter optimization, low delay audio coding, subband ADPCM
ASJC Scopus subject areas
- Computer Science(all)
- Computer Science Applications
- Computer Science(all)
- Signal Processing
- Engineering(all)
- Media Technology
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2015 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics: WASPAA 2015. Institute of Electrical and Electronics Engineers Inc., 2015. 7336937.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Adaptive pre- and post-filtering for a subband ADPCM-based low delay audio codec
AU - Preihs, Stephan
AU - Wacker, Christoph
AU - Ostermann, Jorn
PY - 2015/11
Y1 - 2015/11
N2 - This paper addresses the combination of a low delay subband ADPCM-based audio codec with adaptive pre- and post-filtering for psychoacoustic noise shaping. We present how our basic scheme for error robust subband coding can be combined with two cascades of band shelving filters. The gain parameters of these filters are adapted by an algorithm that is based on power estimates which are obtained from the bandpass filtered subband signals of the codec. Since the subband coding as well as the adaptive pre- and post-filtering include several partially interacting parameters that are hard to adjust manually, a framework for their psychoacoustic controlled global optimization is presented. Experiments and their results show that the combination of our low delay subband ADPCM-based audio codec with adaptive pre-and post-filtering allows for a significant improvement of audio quality without any additional signaling overhead. Furthermore, the global optimization enables finding a psychoacoustical meaningful operating point.
AB - This paper addresses the combination of a low delay subband ADPCM-based audio codec with adaptive pre- and post-filtering for psychoacoustic noise shaping. We present how our basic scheme for error robust subband coding can be combined with two cascades of band shelving filters. The gain parameters of these filters are adapted by an algorithm that is based on power estimates which are obtained from the bandpass filtered subband signals of the codec. Since the subband coding as well as the adaptive pre- and post-filtering include several partially interacting parameters that are hard to adjust manually, a framework for their psychoacoustic controlled global optimization is presented. Experiments and their results show that the combination of our low delay subband ADPCM-based audio codec with adaptive pre-and post-filtering allows for a significant improvement of audio quality without any additional signaling overhead. Furthermore, the global optimization enables finding a psychoacoustical meaningful operating point.
KW - Adaptive pre- and post-filtering
KW - global parameter optimization
KW - low delay audio coding
KW - subband ADPCM
UR - http://www.scopus.com/inward/record.url?scp=84960903522&partnerID=8YFLogxK
U2 - 10.1109/waspaa.2015.7336937
DO - 10.1109/waspaa.2015.7336937
M3 - Conference contribution
AN - SCOPUS:84960903522
BT - 2015 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, WASPAA 2015
Y2 - 18 October 2015 through 21 October 2015
ER -