SPEECH COMMUNICATION UNIT AND METHOD FOR ERROR MITIGATION OF SPEECH FRAMES

摘要

A speech communication unit (100) comprising a speech encoder (134) capable of representing an input speech signal, the speech encoder (134) comprising a transmission path (281) for transmitting a number of speech frames to a speech decoder, the speech encoder (134) characterised by a virtual transmission path (282) for transmitting one or more references for a number of speech frames transmitted in the transmission path (281) wherein the one or more references relate to an alternative speech frame within the number of speech frames transmitted on the transmission path (281) to be used as a replacement frame when a frame is received in error. The speech communication unit provides at least the advantage that a more accurate replacement frame mechanism is provided, thereby reducing the risk of undesirable artefacts being audible in recovered speech frame.