5.1.1 Overview

26.4473GPPCodec for Enhanced Voice Services (EVS)Error concealment of lost packetsRelease 17TS

Many concealment methods are based on signal classification. The frame class is either transmitted and decoded from the bit stream, or estimated in the decoder. This estimation process is specified subsequently in subclause 5.1.2; it is performed in the following during normal decoding, if the decoded frame is ACELP or MDCT based TCX. In the case of mode or rate switching, the buffer storing the signal history is resampled appropriately.