High-quality audio transform coded excitation using trellis codes
T.R. Fischer, Hosang Sung, Jie Zhan, Eunmi Oh · IEEE International Conference on Acoustics Speech and Signal Processing · 2008
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 E8lattice VQ and spherical lossless code used in the AMR-WB+ standard.