Lossless Wideband Speech Coding
نویسندگان
چکیده
This paper investigates lossless coding of wideband speech by adding a lossless enhancement layer to the lossy baselayer produced by a standardised wideband speech coder. Both the ITU-T G.722 and G.722.2 speech coders are examined. Entropy results show that potential compression rates are dependent on the type and bit rate of the baselayer coder as well as the symbol size used by the lossless coder. Higher compression rates were obtained by adding a decorrelation stage prior to lossless encoding. The resulting lossless speech coder operates at a bit rate that is approximately 58% of the bit rate of original digitised wideband speech signal.
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