4. A speech recognition method according to claim 1 , wherein the model parameters comprise the static mean and static variance.
4. A speech recognition method according to claim 1 , wherein the model parameters comprise the static mean and static variance. 5. A speech recognition method according to claim 4 , wherein the model parameters also comprise delta and delta-delta parts of the mean and variance, and where the second order or higher order terms are not calculated for the delta-delta part.