This paper describes the speech and audio codec that has been sub-mitted to ITU-T by Huawei and ETRI as a candidate for the up-coming super-wideband and stereo extensions of Rec. G.729.1 and G.718. The core codec in the current implementation is G.729.1 and the encoded frequency range is increased

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

Abstract not found

Abstract not found

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The formalism of probabilistic graphical models provides a unifying framework for capturing complex dependencies among random variables, and building large-scale multivariate statistical models. Graphical models have become a focus of research in many statistical, computational and mathematical

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

This thesis examines further enhancement to ITU-T G.711.1 speech coder. The original G.711 coder is effectively a low band ��-law quantizer. The G.711.1 extension adds noise feed-back and lower band enhancement layer apart from the higher-band. To further improve the core lower-band coding

to hide encrypted copyright marks or serial numbers in digital audio or video. We then present a number of attacks, some new, on such information hiding schemes. This leads to a discussion of the formidable obstacles that lie in the way of a general theory of information hiding systems (in the sense

transmission in the general switched telephone network