Method and apparatus for classifying whispered and normally phonated speech
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsStanley J. Wenndt, Edward J. Cupples
Life of this patent
Estimating the term…
Abstract
Method and apparatus for the classification of speech signals. Speech is classified into two broad classes of speech production—whispered speech and normally phonated speech. Speech classified in this manner will yield increased performance of automated speech processing systems because the erroneous results that occur when typical automated speech processing systems encounter non-typical speech such as whispered speech, will be avoided.
Claims12
Method for classifying whispered and normally phonated speech, comprising the steps of:
- framing input audio signal into data windows and advancing said windows;
- computing the magnitude of said data over a high frequency range;
- computing the magnitude of said data over a low frequency range;
- computing the ratio of the magnitude from said high frequency range to the magnitude from said low frequency range;
- and
- determining if said ratio greater than 1.2;
- 1 IF said ratio is greater than 1.2, THEN labeling said audio signal as whispered speech, OTHERWISE, labeling said audio signal as normally phonated speech.
Apparatus for classifying whispered and normally phonated speech, comprising:
- means for framing input audio signal into data windows and advancing said windows;
- means for computing the magnitude of said data over a high frequency range;
- means for computing the magnitude of said data over a low frequency range;
- means for computing the ratio of the magnitude from said high frequency range to the magnitude from said low frequency range;
- and
- means for determining if said ratio greater than 1.2;
- where
- 2 IF said ration is greater than 1.2, THEN means for labeling audio signal as whispered speech, OTHERWISE, means for labeling audio signal normally phonated speech.
Dependencies are inferred from the claim text.