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One of the most common yet detrimental compression artifacts in frequency-domain audio codecs is known as pre-echo, which is perceived as a brief noise preceding transient signals, and is discernable even without direct comparison to the original signal. Because of its substantial negative impact on audio quality, many techniques have been proposed to alleviate it, but not without effect on coding...
This paper describes a scalable coder - G.711.1 - which has been standardized by ITU-T for wideband telephony and voice over IP applications. The main feature of this extension is to give wideband scalability to ITU-T G.711, the most widely deployed speech codec. G.711.1 is designed to achieve a very short delay and low complexity. ITU-T evaluation results show that the codec fulfils all the requirements...
In the transition from narrowband to wideband speech communications, there is a need in some applications for a high quality wideband coding scheme interoperable with the ITU-T G.711 narrowband coding standard. This can be accomplished using a multi-layer coding scheme with a G.711 compatible core layer. For optimal wideband quality in the upper layers, this requires using full frequency range (50–4000...
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