Fast Algorithms for Low-Delay SBR Filterbanks in MPEG-4 AAC-ELD

The MPEG committee has recently completed development of a new audio coding standard "MPEG-4 Advanced Audio Coding-Enhanced Low Delay" (AAC-ELD). AAC-ELD is targeted towards high-quality, full-duplex communication applications such as audio and video conferencing. AAC-ELD uses low delay sp...

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Bibliographic Details
Published in:IEEE transactions on audio, speech, and language processing speech, and language processing, 2012-03, Vol.20 (3), p.1022-1031
Main Authors: Chivukula, R. K., Reznik, Y. A., Devarajan, V., Jayendra-Lakshman, M.
Format: Article
Language:English
Subjects:
Advanced audio coding (AAC)
Algorithm design and analysis
Algorithms
Applied sciences
Audio coding
Coding standards
Coding, codes
DCT-IV
Decoding
Delay
Detection, estimation, filtering, equalization, prediction
discrete cosine transform (DCT)
Exact sciences and technology
factorization
fast algorithms
filterbank
Information, signal and communications theory
low delay audio coding
Miscellaneous
Modulation
Modulation, demodulation
Moving Picture Experts Group (MPEG)
Signal and communications theory
Signal processing
Signal, noise
spectral band replication (SBR)
Speech
Studies
Telecommunications and information theory
Transform coding
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Summary:The MPEG committee has recently completed development of a new audio coding standard "MPEG-4 Advanced Audio Coding-Enhanced Low Delay" (AAC-ELD). AAC-ELD is targeted towards high-quality, full-duplex communication applications such as audio and video conferencing. AAC-ELD uses low delay spectral band replication (LD-SBR) technology together with a low delay AAC core encoder to achieve high coding efficiency and low algorithmic delays. In this paper, we present fast algorithms for computing LD-SBR filterbanks in AAC-ELD. The proposed algorithms map complex exponential modulation portion of the filterbanks to discrete cosine transforms of types IV and II. Our proposed mapping also allows to merge some multiplications with the windowing stage that precedes or succeeds the modulation step. This further reduces computational complexity. Our presentation includes detailed explanation and flow-graphs of the algorithms, complexity analysis, and comparisons with alternative implementations.
ISSN:1558-7916
2329-9290
1558-7924
2329-9304
DOI:10.1109/TASL.2011.2170971