1. A method of adaptation of log-spectral parameters comprises the steps of: providing quiet speech models with a clean speech mean vector &mgr; log having a static part and a dynamic part; providing noise models with a noise mean vector {tilde over (&mgr;)} log having a static part and a dynamic part; and comparing the speech vector having a static part and a dynamic part to the noisy vector having the static part and dynamic part to determine if log g&plus;&mgr; log is greater than {tilde over (&mgr;)} log where g accounts for the gain of speech produced in noise with respect to clean speech and if so the static part is equal to log g&plus;&mgr; log and for the dynamic parameter is ∩&mgr; log and if not greater than {tilde over (&mgr;)} log then the static part equals {tilde over (&mgr;)} log and the dynamic part is zero.