Trellis-searched adaptive predictive coding

Considers the use of TCO (trellis coded quantization) in an adaptive predictive coding (APC) structure at encoding rates slightly above one and two bits per sample. The authors examine the effect of long- and short-term predictor order on the encoding performance and study the variation in performance as a function of the TCQ codebook. The simulation results indicate that SNRs (signal/noise ratio) and SEGSNRs (segmental SNRs) as high as 25 and 24 dB, respectively, are possible at rates slightly above two bits per sample using a simple four-state trellis. At higher near one bit per sample, SNRs and SEGNRs as high as 16.5 and 15.5 dB, respectively, are possible