The combination of Vector Quantization (VQ) and predictive techniques -named AVPC systems- has been shown as interesting systems for speech waveform coding at medium-high rates (ref. 1 to 3). In this work we present a such system including a previous four subbbands splitting. This allows good quality of speech at low-medium rates (1-1.25 bits/sample). A comparative study show that the AVPC-SBC outperforms the simple AVPC coder.
CitacióMasgrau, E., Mariño, J.B., Fonollosa, José A. R., Salavedra, J. AVPC-Subband Coding System for Speech Encoding. A: European Conference on Speech Technology. "ECST 1987: European Conference on Speech Technology: Edinburgh, Scotland, UK, September, 1987". Edinburgh, Scotland: 1987, p. 345-348.