MPEG-4 AAC-ELD v2 – The New State of the Art in High Quality Communication Audio Coding

Lutzky, Manfred; Schnell, Markus; Valero, María Luis; Hilpert, Johannes

doi:10.1007/978-3-642-23071-4_32

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The processing latency caused by the signal encoding and signal decoding contributes to the overall transmission latency. Low-latency audio codecs have a coding delay as low as 5 ms [298], [299]. Generally, parametric control data (e.g., MIDI, Open Sound Control) require relatively little bandwidth compared to audio data.…”

Section: J Quality Of Servicementioning

confidence: 99%

The Internet of Sounds: Convergent Trends, Insights, and Future Directions

Turchet

Lagrange

Rottondi

et al. 2023

IEEE Internet Things J.

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Current sound-based practices and systems developed in both academia and industry point to convergent research trends that bring together the field of Sound and Music Computing with that of the Internet of Things. This paper proposes a vision for the emerging field of the Internet of Sounds (IoS), which stems from such disciplines. The IoS relates to the network of Sound Things, i.e., devices capable of sensing, acquiring, processing, actuating, and exchanging data serving the purpose of communicating sound-related information. In the IoS paradigm, which merges under a unique umbrella the emerging fields of the Internet of Musical Things and the Internet of Audio Things, heterogeneous devices dedicated to musical and nonmusical tasks can interact and cooperate with one another and with other things connected to the Internet to facilitate soundbased services and applications that are globally available to the users. We survey the state of the art in this space, discuss the technological and non-technological challenges ahead of us and propose a comprehensive research agenda for the field.

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Section: J Quality Of Servicementioning

confidence: 99%

The Internet of Sounds: Convergent Trends, Insights, and Future Directions

Turchet

Lagrange

Rottondi

et al. 2023

IEEE Internet Things J.

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“…To overcome these issues, MPEG standardized AAC Enhanced Low Delay (AAC-ELD) codec [6], [8], [9], [10] and [11]. This codec addresses the drawbacks of AAC-LD by incorporating a low-delay spectral band replication (LD-SBR) tool and a new low-delay TDAC filterbank.…”

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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Perceptual Audio Coding

Herre

Disch

2014

Academic Press Library in Signal Processing: Volume 4 - Image, Video Processing and Analysis, Hardware, Audio, Acoustic and Spe

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MPEG-4 AAC-ELD v2 – The New State of the Art in High Quality Communication Audio Coding

Cited by 5 publications

References 3 publications

The Internet of Sounds: Convergent Trends, Insights, and Future Directions

The Internet of Sounds: Convergent Trends, Insights, and Future Directions

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

Perceptual Audio Coding

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