METHOD OF SPEECH RECOGNITION

A method of speech recognition includes the steps of predetermining a series of parameters a.sub.1, a.sub.2, . . . , a.sub.J representative of standard patterns of speeches of preset words, where the letter J denotes a predetermined natural number; deriving parameters x.sub.i representative of data of respective frames of an input signal, the adscript i denotes a frame number; calculating similarities d.sub.j.sup.(i) between the parameters a.sub.j and the parameters x.sub.i, where j=1, 2, . . . , J; calculating parameters R.sub.j.sup.(i) for the respective preset words by referring to the following recurrence formulas: EQU R.sub.1.sup.(i) =d.sub.1.sup.(i) EQU R.sub.j.sup.(i) =d.sub.j.sup.(i) +opt(R.sub.j-1.sup.(i-h),R.sub.j-1.sup.(i-h-1),R.sub.j-1.sup.(i-h-2), . . . ,R.sub.j-1.sup.(i-h-m)) where j=2, 3, . . . , J; the character h and m denote preset positive integers; and the character opt denotes an operator of selecting an optimal member of terms in related parentheses; and selecting one of the preset words as a recognition result, the selected word corresponding to an optimal value of the parameters R.sub.j.sup.(i).