Wideband Speech Coding Advances in VMR-WB Standard

Jelinek, Milan; Salami, R.

doi:10.1109/tasl.2007.894514

Cited by 23 publications

(5 citation statements)

References 9 publications

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“…After the development of the AMR codecs, another speech codec, called the Variable Multirate (VMR) codec, was standardized [39]. This codec allowed rate switching at the frame boundaries not only as a result of network control but also due to the analysis of the input speech source.…”

Section: Speech Coding Standardsmentioning

confidence: 99%

Speech Compression

Gibson

2016

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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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Section: Speech Coding Standardsmentioning

confidence: 99%

Speech Compression

Gibson

2016

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“…The voicing strength permits to distinguish voiced and unvoiced phonemes of the speech and is expected to create at least two clusters in the feature space. The voicing strength uses the speech classification parameters from the VMR-WB speech codec [9]. Zero crossing rate (zc), spectral tilt (tilt), pitch stability (ps), and normalized correlation of the pitch (nc) are derived after a Linear Prediction (LP) and a Long-Term Prediction (LTP) analyses of the signal.…”

Section: Short-term Featuresmentioning

confidence: 99%

A robust speech/music discriminator for switched audio coding

Fuchs

2015

2015 23rd European Signal Processing Conference (EUSIPCO)

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Switching between speech coding and generic audio coding schemes was recently proven to be very efficient for coding a large range of audio materials at low bit-rates. However, it strongly relies on a robust classification of the input signal. The aim of the paper is to design a reliable speech and music discriminator (SMD) for such an application. Main attention was laid on getting a good tradeoff between accuracy, reactivity and stability of the decision while keeping the delay and complexity reasonably low. To this end, short-term and long-term features are dissociated before being conveyed to two different classifiers. The two classifier outputs are combined in a final decision using a hysteresis. Objective measures show that a more reliable switching decision is achievable. The SMD was successfully implemented in MPEG Unified Speech and Audio Coding (USAC). It allows the codec to show unprecedented audio quality

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“…Research results [7][8][9] show that proper features and in turn good performance can only be obtained based on numerous experiments. Open-loop coding mode selection is essentially one kind of pattern classification.…”

Section: A Semi-open-loop Coding Mode Selection Algorithm Based mentioning

confidence: 99%

A semi-open-loop coding mode selection algorithm based on EFM and selected AMR-WB+ features

Hong

Zhao

Kuang

2009

J. Electron.(China)

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To solve the problems of the AMR-WB+ (Extended Adaptive Multi-Rate-WideBand) semi-open-loop coding mode selection algorithm, features for ACELP (Algebraic Code Excited Linear Prediction) and TCX (Transform Coded eXcitation) classification are investigated. 11 classifying features in the AMR-WB+ codec are selected and 2 novel classifying features, i.e., EFM (Energy Flatness Measurement) and stdEFM (standard deviation of EFM), are proposed. Consequently, a novel semi-open-loop mode selection algorithm based on EFM and selected AMR-WB+ features is proposed. The results of classifying test and listening test show that the performance of the novel algorithm is much better than that of the AMR-WB+ semi-open-loop coding mode selection algorithm.

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Wideband Speech Coding Advances in VMR-WB Standard

Cited by 23 publications

References 9 publications

Speech Compression

Speech Compression

A robust speech/music discriminator for switched audio coding

A semi-open-loop coding mode selection algorithm based on EFM and selected AMR-WB+ features

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