Overview of the EVS codec architecture

Dietz, Martin; Multrus, Markus; Eksler, Vaclav; Malenovsky, Vladimir; Norvell, Erik; Pobloth, Harald; Miao, Lei; Wang, Zhe; Laaksonen, Laura; Vasilache, Adriana; Kamamoto, Yutaka; Kikuiri, Kei; Ragot, S.; Faure, Julien; Ehara, Hiroyuki; Rajendran, Vivek; Atti, Venkatraman; Sung, Hosang; Oh, Eunmi; Yuan, Haitao; Zhu, Changbao

doi:10.1109/icassp.2015.7179063

Cited by 80 publications

(37 citation statements)

References 15 publications

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“…Note that we do not study the newest standardized voice codec, designated Enhanced Voice Services (EVS) [20], since it is not widely deployed at present. Further, AMR was standardized in December 2000 and has been the default codec in 3GPP cellular systems, including Long Term Evolution (LTE), through 2014, when the new EVS codec was standardized [19,21].…”

Section: Resultsmentioning

confidence: 99%

Log Likelihood Spectral Distance, Entropy Rate Power, and Mutual Information with Applications to Speech Coding

Gibson

Mahadevan

2017

Entropy

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Abstract:We provide a new derivation of the log likelihood spectral distance measure for signal processing using the logarithm of the ratio of entropy rate powers. Using this interpretation, we show that the log likelihood ratio is equivalent to the difference of two differential entropies, and further that it can be written as the difference of two mutual informations. These latter two expressions allow the analysis of signals via the log likelihood ratio to be extended beyond spectral matching to the study of their statistical quantities of differential entropy and mutual information. Examples from speech coding are presented to illustrate the utility of these new results. These new expressions allow the log likelihood ratio to be of interest in applications beyond those of just spectral matching for speech.

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Section: Resultsmentioning

confidence: 99%

Log Likelihood Spectral Distance, Entropy Rate Power, and Mutual Information with Applications to Speech Coding

Gibson

Mahadevan

2017

Entropy

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“…The newest speech codec to be standardized is the Enhanced Voice Services (EVS) codec designed specifically for 4th generation VoLTE but is expected to be deployed in many applications because of its performance and its wide-ranging set of operable modes [40]. The new EVS codec uses the ACELP codec structure and builds on components of the AMR-WB codec.…”

Section: Speech Coding Standardsmentioning

confidence: 99%

“…There are also improvements in coding of mixed content, voice activity detection, comfort noise generation, low delay coding, and switching between linear prediction and MDCT (modulated discrete cosine transform) coding modes. Further details on the EVS codec can be found in the extensive set of papers cited in [40].…”

Section: Speech Coding Standardsmentioning

confidence: 99%

“…While the pre-processing stages have gotten more sophisticated in classifying the types of inputs and identifying the presence of background impairments [40], this is still a challenging issue. Any background sound that is not correctly identified as background noise can significantly degrade the speech coding operation since the CELP codecs are designed primarily to code speech.…”

Section: Current Challengesmentioning

confidence: 99%

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Speech Compression

Gibson

2016

Information

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Speech compression is a key technology underlying digital cellular communications, VoIP, voicemail, and voice response systems. We trace the evolution of speech coding based on the linear prediction model, highlight the key milestones in speech coding, and outline the structures of the most important speech coding standards. Current challenges, future research directions, fundamental limits on performance, and the critical open problem of speech coding for emergency first responders are all discussed.

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“…This category includes transform domain weighted interleave vector quantization (TwinVQ) [15,16], the TwinVQ tool in MPEG-4 general audio [17], a low-delay coding in [18], low-bit rate modes in MPEG-D unified speech and audio coding (USAC) [19][20][21], and some of the modes in 3GPP enhanced voice services (EVS) [22][23][24][25][26][27].…”

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confidence: 99%