6.1.3 Synthesis

26.4453GPPCodec for Enhanced Voice Services (EVS)Detailed algorithmic descriptionRelease 15TS

The LP synthesis is performed by filtering the post-processed excitation signal through the LP synthesis filter.. The decoded and interpolated LP coefficients,, are used to construct the synthesis filter, .

The reconstructed speech for the subframe of size 64 is given by

()

The synthesized signal is then de-emphasized by filtering through the filter (inverse of the pre-emphasis filter applied at the encoder input).

The de-emphasis synthesis speech is then passed through an adaptive post-processing which is described in the following section.