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Embedded Speech Codec Based on Speex

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Embedded speech coding technique is of interest for many applications like VoIP, Multimedia Broadcasting, Video Conferencing. We propose a CELP based embedded speech codec that is operable for both narrowband and wideband speech signals. Our three-layered embedded codec offers three bit-rates. This embedded codec is based on Speex codec. In our embedded speech codec, innovation vectors of the higher layers are embedded in the innovation vector of the lowest layer. All speech coding parameters but innovation vector are shared between lowest layer and higher layers. In our algorithm, higher bit rates are rewarded with better quality penalizing the lowest bit rate.

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