CRITICAL-BAND FILTER ANALYSIS OF SPEECH SENTENCES
Two-hundred English sentences, each spoken by 10 native speakers (5 females and 5 males) of British English, were analyzed with a bank of 20 critical-band filters. Principal component analysis was applied to the power fluctuation of filter outputs. The first three components accounted for 35.3% of the total variance. A varimax rotated solution of the components was obtained. The first component was interpreted as a "sonority filter" that is closely related to the first and the second formants of vowels. The second component seemed to be related with nasalization, and the third component with fricatives, affricates, and stops. The existence of common frequency channels in perceiving normal speech and noise-vocoded speech were suggested.