1. 77 010002000300040005000 0 1 2 3 4 5 6 7 FREQUENCY (HZ) LOG10 MAGNITUDE Figure 2.30a. PSD of original voice. 0.10.20.30.40.5 0 0.02 0.04 0.06 0.08 0.1 0.12 TIME (SEC) 0.0050.010.0150.02 0 0.04 0.06 0.08 0.1 0.12 TIME (SEC) 0.0050.010.0150.02 0 0.04 0.06 0.08 0.1 0.12 TIME (SEC) 010002000300040005000 -2 0 1 2 3 4 5 6 7 FREQUENCY (HZ) LOG10 MAGNITUDE Figure 2.30e. Orig. PSD, aspiration PSD, and vocal tract. 010002000300040005000 1.5 2 2.5 3 3.5 4 4.5 FREQUENCY (HZ) LOG10 MAGNITUDE Figure 2.30f. Source aspiration PSD with vocal tract removed and fitted to 25-point piecewise-linear model. Peaks removed here Original. Spectrum Nonperiodic Spectrum Vocal tract Transfer Function Aspiration Spectrum Fitted model 0 0 Figure 2.30c. Cepstrum (expanded scale).Figure 2.30d. Comb-liftered cepstrum of 2.30c. 0 Figure 2.30b. Cepstrum of original voice.

2. 78 0100200300400500600700800 0 1 2 3 4 5 6 7 FREQUENCY (HZ) Figure 2.31. Power spectra of original voice (top), voice with FM tremor removed (middle), and voice with all FM removed (bottom). RELATIVE POWER (LOG10 MAGNITUDE)

3. 79 05101520253035 -30 -25 -20 -15 -10 -5 0 NSR (dB) CASE# - SORTED BY ASCENDING ORIGINAL NSR Figure 2.32. Cepstral NSR measurements for six combinations of AM and FM demodulation. The horizontal axis is case number when cases are sorted by original voice NSR. Curves fall into 3 groups: original voice and original voice AM demod. (top pair), tremor demod. and tremor plus AM demod. (middle pair), and all FM demod. and all FM demod. plus AM demod. (bottom pair). AM modulation appears to have a minimal effect. LEGEND ORIGINAL (TOP) ORIGINAL, AM RMVD TREMOR RMVD (MIDDLE) TERMOR RMVD, AM REMVD ALL FM RMVD (BOTTOM) ALL FM RMVD, AM REMVD