PURPOSE:To increase a processing speed by extracting a sampling point which corresponds to a vowel part in a monosyllable, by selecting a recognition-expectant monosyllable, through the collation with the previously-registered reference vowel feature quantity, and by collating the monosyllable with an unknown voice. CONSTITUTION:By making use of the steadiness of the extracted feature quantity, steady-vowel-part extraction circuit 6 extracts a sampling point which corresponds to a vowel part in a monosyllable and then collates 10 a vowel feature quantity, which corresponds to this sampling point, with the reference vowel feature quantity previously registered for each monosyllable. As a result, the recognition-expectant monosyllable is determined and then collated 13 again with an unknown voice. Consequently, the processing speed can be increased.
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