High-quality audio transform coded excitation using trellis codes

A trellis source code and novel variable-length lossless code are used in transform coded excitation audio coding. Implemented within the extended adaptive multi-rate wideband (AMR-WB+) audio coding framework, the proposed quantization and lossless coding method provide between 0.4 and 0.7 dB increase in signal-to-noise ratio over the E8 lattice VQ and spherical lossless code used in the AMR-WB+ standard.

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