Figure 7. Speech signal after FFT-Development an Automatic Speech to Facial Animation Conversion for Improve Deaf Lives

<p>Use of speech spectrum for changing the work domain on the signal from time to frequency<br> is used via Fourier conventions. The rapid and practical way of estimating Spectrum in such<br> applications is employment of rapid Fourier transform. The final stage is extracting particularities is<br> use of discrete cosine to return particularities to the time domain and converse FFT approximation.<br> Major advantage of this method is decrease of number of particularities of number of filter from f N<br> to c N in which c f N &le; N . In addition, doing so, includes making independent of the obtained<br> particularity and rendering them non dependant which leads matrix covariance features to become<br> axial. The following equation shows this point.</p>