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The adaptive multirate wideband speech codec (AMR-WB)

This paper describes the adaptive multirate wideband (AMR-WB) speech codec selected by the Third Generation Partnership Project (3GPP) for GSM and the third generation mobile communication WCDMA…
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Unified speech and audio coding scheme for high quality at low bitrates

This new codec forms the basis of the reference model in the ongoing MPEG standardization activity for Unified Speech and Audio Coding, which results in a codec that exhibits consistently high quality for speech, music and mixed audio content.
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AMR-WB+: a new audio coding standard for 3rd generation mobile audio services

The requirements imposed by mobile audio services are discussed and a technology overview of AMR-WB+ as a codec matching these requirements while providing outstanding audio quality is given.
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Low-complexity multi-rate lattice vector quantization with application to wideband TCX speech coding at 32 kbit/s

A practical multi-rate quantization system based on Voronoi extension and derived from the lattice RE/sub 8/.
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ITU-T G.729 Annex A: reduced complexity 8 kb/s CS-ACELP codec for digital simultaneous voice and data

The algorithm introduced to achieve the low complexity goal while meeting the terms of reference is described and it is shown that the performance of G.729A is equivalent to both G.726 at 32 kb/s in most operating conditions.
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The ISO/MPEG Unified Speech and Audio Coding Standard—Consistent High Quality for All Content Types and at All Bit Rates

All aspects of this standardization effort are outlined, starting with the history and motivation of the MPEG work item, describing all technical features of the final system, and further discussing listening test results and performance numbers which show the advantages of the new system over current state-of-the-art codecs.

A Novel Scheme for Low Bitrate Unified Speech and Audio Coding – MPEG RM0

This paper describes this codec in detail and shows that the new reference model reaches the goal of consistent high quality for all signal types.

Description of ITU-T Recommendation G.729 Annex A: reduced complexity 8 kbit/s CS-ACELP codec

Several algorithmic changes have been introduced into G.729 which resulted in 50% drop in its complexity, enabling a DSP implementation with a complexity of about 10-12 MIPS, while meeting the terms of reference.
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Universal speech/audio coding using hybrid ACELP/TCX techniques

This paper presents a hybrid audio coding algorithm integrating an LP-based coding technique and a more general transform coding technique, which has consistently high performance for both speech and music signals.
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A wideband speech and audio codec at 16/24/32 kbit/s using hybrid ACELP/TCX techniques

A hybrid ACELP/TCX algorithm for coding speech and music signals at 16, 24, and 32 kbit/s is presented. The algorithm switches between algebraic code excited linear prediction (ACELP) and transform…
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