2. A speech recognition device as claimed in claim 1, further comprising a determining unit, connected to said normalizing unit, for outputting as a recognition result when said normalized similarity measure is greater than a predetermined threshold, a signal indicative of a specific one of said prepared reference patterns that gives said provisional similarity measure.
2. A speech recognition device as claimed in claim 1, further comprising a determining unit, connected to said normalizing unit, for outputting as a recognition result when said normalized similarity measure is greater than a predetermined threshold, a signal indicative of a specific one of said prepared reference patterns that gives said provisional similarity measure. 3. A speech recognition device as claimed in claim 2, further comprising a rejection unit, connected to said normalizing unit, for outputting a reject signal indicating that said input speech signal cannot be recognized when said normalized similarity measure is not greater than said predetermined threshold value.