ITU-T G.729.1: AN 8-32 Kbit/S Scalable Coder Interoperable with G.729 for Wideband Telephony and Voice Over IP

Ragot, S.; Kovesi, B.; Trilling, R.; Virette, David; Đức, Nguyễn Minh; Massaloux, D.; Proust, S.; Geiser, Bernd; Gartner, M.; Schandl, S.; Taddei, H.; Gao, Yang; Shlomot, E.; Ehara, Hiroyuki; Yoshida, Kōji; Vaillancourt, Tommy; Salami, R.; Lee, Mi Suk; Kim, Do Young

doi:10.1109/icassp.2007.366966

Cited by 53 publications

(30 citation statements)

References 3 publications

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“…In this section, we apply the proposed method and the MFCC-based BWE method to extend the bandwidth of the WB audio reproduced by the G.729.1 WB codec [26,31], in order to make a direct comparison with the SWB extension method with side information which is employed in G.729.1 Annex E [32] in terms of the objective and subjective quality tests. In addition, we make a subjective comparison between the original WB audio signals and the audio signals extended by the proposed method for further evaluating the improvement of the proposed method on the auditory quality.…”

Section: Performance Evaluation and Test Resultsmentioning

confidence: 99%

Audio bandwidth extension based on temporal smoothing cepstral coefficients

Liu

Bao

2014

J AUDIO SPEECH MUSIC PROC.

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In this paper, we propose a wideband (WB) to super-wideband audio bandwidth extension (BWE) method based on temporal smoothing cepstral coefficients (TSCC). A temporal relationship of audio signals is included into feature extraction in the bandwidth extension frontend to make the temporal evolution of the extended spectra smoother. In the bandwidth extension scheme, a Gammatone auditory filter bank is used to decompose the audio signal, and the energy of each frequency band is long-term smoothed using minima controlled recursive averaging (MCRA) in order to suppress transient components. The resulting 'steady-state' spectrum is processed by frequency weighting, and the temporal smoothing cepstral coefficients are obtained by means of the power-law loudness function and cepstral normalization. The extracted temporal smoothing cepstral coefficients are fed into a Gaussian mixture model (GMM)-based Bayesian estimator to estimate the high-frequency (HF) spectral envelope, while the fine structure is restored by spectral translation. Evaluation results show that the temporal smoothing cepstral coefficients exploit the temporal relationship of audio signals and provide higher mutual information between the low-and high-frequency parameters, without increasing the dimension of input vectors in the frontend of bandwidth extension systems. In addition, the proposed bandwidth extension method is applied into the G.729.1 wideband codec and outperforms the Mel frequency cepstral coefficient (MFCC)-based method in terms of log spectral distortion (LSD), cosh measure, and differential log spectral distortion. Further, the proposed method improves the smoothness of the reconstructed spectrum over time and also gains a good performance in the subjective listening tests.

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Section: Performance Evaluation and Test Resultsmentioning

confidence: 99%

Audio bandwidth extension based on temporal smoothing cepstral coefficients

Liu

Bao

2014

J AUDIO SPEECH MUSIC PROC.

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“…Thus, some approaches have been proposed for low delay audio codec such as in [118][119]. It is also interesting to look at approaches based on speech coding, such as in [110][111][112][113][114][115][116][117][118][119][120][121][122][123][124][125], to extend their capability to have full audio band and multichannel speech codec.…”

Section: Future Directionmentioning

confidence: 99%

Reviews on Technology and Standard of Spatial Audio Coding

Elfitri

Luthfi²

2017

JNTE

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Abstract-Market demands on a more impressive entertainment media have motivated for delivery of three dimensional (3D) audio content to home consumers through Ultra High Definition TV (UHDTV), the next generation of TV broadcasting, where spatial audio coding plays fundamental role. This paper reviews fundamental concept on spatial audio coding which includes technology, standard, and application. Basic principle of object-based audio reproduction system will also be elaborated, compared to the traditional channel-based system, to provide good understanding on this popular interactive audio reproduction system which gives end users flexibility to render their own preferred audio composition.

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“…In practice, the parameters of a lost frame should be estimated by extrapolating the parameters of a previous good frame. Figure 1 shows a block diagram of the PLC algorithm employed in the ITU-T Recommendation G.729.1 decoder [17]. The PLC algorithm is composed of low-band and highband PLC modules.…”

Section: Conventional Plc Algorithmmentioning

confidence: 99%

A Packet Loss Concealment Technique Improving Quality of Service for Wideband Speech Coding in Wireless Sensor Networks

Park

Kang

Lee

et al. 2014

International Journal of Distributed Sensor Networks

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A packet loss concealment (PLC) algorithm is proposed to improve the quality of decoded speech when packet losses occur in a wireless sensor network. The proposed algorithm is mainly based on artificial bandwidth extension (ABE) from narrowband to wideband. It consists of three main functions: packet loss concealment in the narrowband, ABE in the modified discrete cosine transform (MDCT) domain, and smoothing of wideband MDCT coefficients with those of the last good frame. The performance of the proposed PLC algorithm is implemented by replacing the PLC algorithm employed in the ITU-T Recommendation G.729.1. The experimental results show that the proposed PLC algorithm provides significantly better speech quality than the PLC in the ITU-T G.729.1.

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ITU-T G.729.1: AN 8-32 Kbit/S Scalable Coder Interoperable with G.729 for Wideband Telephony and Voice Over IP

Cited by 53 publications

References 3 publications

Audio bandwidth extension based on temporal smoothing cepstral coefficients

Audio bandwidth extension based on temporal smoothing cepstral coefficients

Reviews on Technology and Standard of Spatial Audio Coding

A Packet Loss Concealment Technique Improving Quality of Service for Wideband Speech Coding in Wireless Sensor Networks

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