Efficient algorithms for MPEG-4 AAC-ELD, AAC-LD and AAC-LC filterbanks

Chivukula, Ravi K.; Reznik, Yuriy A.; Devarajan, Venkat

doi:10.1109/icalip.2008.4590245

Cited by 9 publications

(1 citation statement)

References 17 publications

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“…In this paper, we present two fast algorithms for AAC-ELD TDAC filterbanks. In the first algorithm, we map the Low delay analysis and synthesis filterbanks to the well known MDCT and IMDCT respectively [16]. The mapping involves only permutations, sign changes and additions.…”

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.

Self Cite

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Fast Algorithms

Rao¹,

Kim²,

Hwang³

2010

Fast Fourier Transform - Algorithms and Applications

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An efficient algorithm for double compressed AAC audio detection

Jin

Wang

Yan

et al. 2015

Multimed Tools Appl

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As a new generation of compression encoding standard, MPEG-2/4 Advanced Audio Coding (AAC) would be a widely-used audio format in the near future. However, these AAC audios often be forged by audio forgers for their own benefits in some significant events, which will cause double AAC compression. In this paper, the probability values and Markov features based on the Huffman codebook indexes of AAC audio were constructed and an efficient algorithm is proposed to detect double compression. Experimental results demonstrate that our method has high detection accuracy and low computational complexity. To the best of our knowledge, it is the first time to apply double compression detection to AAC audio forensics.

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Efficient algorithms for MPEG-4 AAC-ELD, AAC-LD and AAC-LC filterbanks

Cited by 9 publications

References 17 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

Fast Algorithms

An efficient algorithm for double compressed AAC audio detection

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