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

Chivukula, Ravi K.; Reznik, Yuriy A.; Devarajan, Venkat; Jayendra-Lakshman, M.

doi:10.1109/tasl.2011.2170971

Cited by 9 publications

(1 citation statement)

References 13 publications

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“…Especially in mobile devices, there is a need to reduce computational complexity to reduce battery power consumption. In [12] we presented fast algorithms for the LD-SBR filterbanks in AAC-ELD. In this paper, we present two fast algorithms for AAC-ELD TDAC filterbanks.…”

Section: Introductionmentioning

confidence: 99%

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

Chivukula

Reznik

et al. 2014

IEEE/ACM Trans. Audio Speech Lang. Process.

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Abstract-The MPEG committee has completed development of a new audio coding standard called "MPEG-4 advanced audio coding-enhanced low delay" (AAC-ELD). AAC-ELD uses low delay spectral band replication (LD-SBR) technology together with a low delay time domain alias cancellation (LD TDAC) filterbank in the encoder to achieve both high coding efficiency and low algorithmic delay. In this paper, we present fast algorithms for implementing LD-TDAC filterbanks in AAC-ELD. Two types of fast algorithms are presented. In the first, we map LD-TDAC analysis and synthesis filterbanks to modified discrete cosine transform (MDCT) and inverse modified discrete cosine transform (IMDCT), respectively. Since MDCT/IMDCT are already extensively used in AAC and they have many fast algorithms, this mapping not only provides a fast implementation but also allows a common implementation of the filterbanks in AAC Low Complexity (AAC-LC), AAC Low Delay (AAC-LD) and AAC-ELD codecs. In the second algorithm, we provide a mapping to discrete Cosine transform of type II. The mapping to DCT-II allows the merger of the matrix operations with the windowing stage that precedes or follows them. This further reduces the number of multiplications and leads to an algorithm with the lowest known arithmetic complexity. For filterbanks of lengths 1024 and 960, we also present a new fast factorization of 15-point DCT-II that requires only 14 irrational multiplications, 3 dyadic rational multiplications and 67 additions.

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Section: Introductionmentioning

confidence: 99%

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

Chivukula

Reznik

et al. 2014

IEEE/ACM Trans. Audio Speech Lang. Process.

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An Optimization Scheme for SVAC Audio Encoder

Shu

Pan

2014

Progress in Pattern Recognition, Image Analysis, Computer Vision, and Applications

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Both audio signals and MEL-frequency cepstral coefficients are encoded in SVAC audio encoder. These two independent processing leads to structural redundancies for the encoder design. This paper proposes an optimization scheme using MEL-frequency cepstral coefficients to realize high-frequency reconstruction and removes Bandwidth Extension module of the original encoder. Simulation results prove that the new encoder has considerable improvement on structure, reconstructed high-frequency precision and coding quality.

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A Hardware/Software Co-design of High Efficiency AAC Audio Decoder

Tsai

Chen

2016

J Sign Process Syst

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

Cited by 9 publications

References 13 publications

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

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

An Optimization Scheme for SVAC Audio Encoder

A Hardware/Software Co-design of High Efficiency AAC Audio Decoder

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