1. FUNDAMENTAL PERIOD TRACK FEATURES
0.010
0.020
0.030
0.040
0.050
0.5 1
1.5 2
2.5 3
3.5 4
4.5 5
x 10
TIME (SEC)
SMOOTHED ABS ORIG VOICE
FUNDAMENTAL PERIOD TRACK FEATURES
ENVELOPE MINIMA
Figure Plot of absolute value of original voice signal over 3 periods illustrating fundamental pulse segregation. Fundamental frequency tracking features (X) are used as a starting point for searching for minima (circles), which define the pulse boundaries.

2. POWER (NORMALIZED) TIME (SEC) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2
0.2
TIME (SEC)
Figure Power time history of same signal as Fig The results of the pulse identification (Fig 2.19) are used to calculate the energy (sum of samples squared) of each fundamental pulse.

3. ORIGINAL POWER ( LINE) AND LOW FREQ. AM (DASH)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9 1
1.2
1.4
1.6
1.8
POWER
TIME (SEC)
-20
-15
-10 -5 5 10 15
DELTA POWER PERCENT
ORIGINAL POWER ( LINE) AND LOW FREQ. AM (DASH)
SHIM% = 100*(POWER - LOWPASS POWER)/POWER
Figure Power time history resolved into low frequency volume (top) and high frequency shimmer (bottom) components. The same signal is used as in previous figures.

4. Figure 2.28. Histogram of shimmer values displays Gaussian form.
-20
-15
-10 -5 5 10 15 20 25 30 35 40
DELT PWR (%)
#OCCURRANCES
SHIM% HIST. STAND DEV = 4.823%
Figure Histogram of shimmer values displays Gaussian form.

5. ENERGY POWER (CONSTANT) SUM MAX AMP
1.05 1
ENERGY
0.95
POWER
(CONSTANT)
SUM
0.9
POWER, ENERGY, SIGNAL (NORMALIZED TO 1)
0.85
MAX AMP
0.8
0.75
0.25
0.5
0.75
1.0
TIME (SEC)
Figure Power measures in the AM demodulated voice. The constant value of the power level time series verifies successful processing. Other measures of signal strength such as envelope amplitude show residual variations.