A robust 2400 bit/s MBE-LPC speech coder incorporating joint source and channel coding

A robust speech coder based on the multiband excitation (MBE) model is presented. Unlike many MBE coders, the spectral envelope information is represented using linear predictive coefficients (LPCs), which are quantized and encoded using a joint source and channel trellis coding scheme to obtain remarkable robustness to random channel errors without increase in bit rate (i.e., no redundant forward error correction (FEC) required). The coder produces communications quality speech at 2400 b/s and can maintain acceptable speech quality at bit error rates (BERs) up to 5%. The complexity is low enough for implementation on commercial DSP devices.<<ETX>>