Residually excited LPC processor for enhancing helium speech intelligibility
G. Duncan, M.A. Jack · Electronics Letters · 1983
A new approach to restoring the intelligibility of divers' speech uttered in a high-pressure atmosphere containing high percentages of helium gas is presented. The system processing architecture consists of a residually excited linear predictive coder (RELPC) with a novel implementation of time/frequency-domain relationships to simplify processing.