1

0 1000 2000 3000 4000 50000

1

2

3

4

5

6

7

FREQUENCY (HZ)

LOG

10 M

AG

NIT

UD

E

Figure 2.30a. PSD of original voice.

0.1 0.2 0.3 0.4 0.5

0

0.02

0.04

0.06

0.08

0.1

0.12

TIME (SEC)

0.005 0.01 0.015 0.02

0

0.02

0.04

0.06

0.08

0.1

0.12

TIME (SEC)0.005 0.01 0.015 0.02

0

0.02

0.04

0.06

0.08

0.1

0.12

TIME (SEC)

0 1000 2000 3000 4000 5000-2

-1

0

1

2

3

4

5

6

7

FREQUENCY (HZ)

LOG

10 M

AG

NIT

UD

E

Figure 2.30e. Orig. PSD, aspiration PSD, and vocal tract.

0 1000 2000 3000 4000 50001.5

2

2.5

3

3.5

4

4.5

FREQUENCY (HZ)

LOG

10 M

AG

NIT

UD

E

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

0 100 200 300 400 500 600 700 800

-1

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).

RE

LA

TIV

E P

OW

ER

(L

OG

10 M

AG

NIT

UD

E)

3

0 5 10 15 20 25 30 35

-30

-25

-20

-15

-10

-5

0

NS

R (

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