AMR-WB+: a New Audio Coding Standard for 3rd Generation Mobile Audio Services

Makinen, J.; Bessette, B.; Bruhn, Stefan; Ojala, P.; Salami, R.; Taleb, A.

doi:10.1109/icassp.2005.1415603

Cited by 55 publications

(37 citation statements)

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“…In the standard selection phase, the AMR-WB+ showed a unique performance at low bitrates from below 10kbps up to 24kbps [1]. This qualified performance is largely due to the hybrid structure integrating both the speech and transform coding techniques.…”

Section: Introductionmentioning

confidence: 99%

Improved Frame Mode Selection for AMR-WB+ Based on Decision Tree

Kim

2008

IEICE Transactions on Information and Systems

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SUMMARY In this letter, we propose a coding mode selection method for the AMR-WB+ audio coder based on a decision tree. In order to reduce computation while maintaining good performance, decision tree classifier is adopted with the closed loop mode selection results as the target classification labels. The size of the decision tree is controlled by pruning, so the proposed method does not increase the memory requirement significantly. Through an evaluation test on a database covering both speech and music materials, the proposed method is found to achieve a much better mode selection accuracy compared with the open loop mode selection module in the AMR-WB+.

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Section: Introductionmentioning

confidence: 99%

Improved Frame Mode Selection for AMR-WB+ Based on Decision Tree

Kim

2008

IEICE Transactions on Information and Systems

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“…MPEG USAC은 12-64Kbps의 전송률에서 기존의 AMR-WB+ [4] 및 HE-AAC v2 [5] 에 포함된 기술들을 확장 및 수정 하여 향상된 성능을 얻도록 제정한 표준이다. MPEG USAC에서는 주파수 대역별로 부호화가 수행된다.…”

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A Performance Evaluation of the MPEG USAC with Variable Core-Band Down-Sampling Ratio

Lee¹,

Kim

2013

Journal of Broadcast Engineering

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This paper deals with the effect of the internal sampling frequency and core band down sampling ratio on the overall performance of the MPEG USAC. Here, the internal sampling frequency is the sampling frequency of a signal actually coded. The core band down sampling ratio is the ratio of the width of the core band over that of the coded band. The performance was measured on 6 different test sound sources by the MUSHRA test with 10 subjects. The experiments showed that 1/3 or 1/4 core band down sampling ratio could yield the better performance than the conventional 1/2 ratio, especially at low rates.Keyword : down-sampling ratio of core band, USAC, internal sampling frequency 및 HE-AAC v2 [5] 에 포함된 기술들을 확장 및 수정 정규논문 (Regular Paper)

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“…In an initial stage of designing the coding structure, it was not possible to acquire high-quality output to all input contents because only a single type of traditional audio or speech coding structure was adopted. The best result could be obtained by simultaneously running two types of codecs: Adaptive Multi-rate Wideband plus (AMR-WB+ [3]) for speech signals and high-efficiency advanced audio coding (HE-AAC [4]) for audio signals. In case of encoding signals with mixed characteristics, one of two coding modes is chosen depending on the characteristic of input contents.…”

Section: Introductionmentioning

confidence: 99%

New aliasing cancelation algorithm for the transition between non-aliased and TDAC-based coding modes

Song

Kang

2014

J AUDIO SPEECH MUSIC PROC.

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This paper proposes a new aliasing cancelation algorithm for the transition between non-aliased coding and transform coding with time domain aliasing cancelation (TDAC). It is effectively utilized for unified speech and audio coding (USAC) that was recently standardized by the Moving Picture Experts Group (MPEG). Since the USAC combines two coding methods with totally different structures, a special processing called forward aliasing cancelation (FAC) is needed at the transition region. Unlike the FAC algorithm embedded in the current standard, the proposed algorithm does not require additional bits to encode aliasing cancelation terms because it appropriately utilizes adjacent decoded samples. Consequently, around 5% of total bits are saved at 16-and 24-kbps operating modes in speech-like signals. The proposed algorithm is sophisticatedly integrated on the decoding module of the USAC common encoder (JAME) for performance verification, which follows the standard process exactly. Both objective and subjective experimental results confirm the feasibility of the proposed algorithm, especially for contents that require a high percentage of mode switching.

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AMR-WB+: a New Audio Coding Standard for 3rd Generation Mobile Audio Services

Cited by 55 publications

References 1 publication

Improved Frame Mode Selection for AMR-WB+ Based on Decision Tree

Improved Frame Mode Selection for AMR-WB+ Based on Decision Tree

A Performance Evaluation of the MPEG USAC with Variable Core-Band Down-Sampling Ratio

New aliasing cancelation algorithm for the transition between non-aliased and TDAC-based coding modes

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