Half rate speech; Half rate speech processing functions
The present document is an introduction to GSM 06.20 [4], GSM 06.21 [5], GSM 06.22 [6], GSM 06.41 [7] and GSM 06.42 [8] TSs dealing with the speech processing functions in the half‑rate channel of the GSM system. A general overview of the speech processing functions is given, with reference to the TSs where each function is specified in detail.