Digital Signal Processing Reference
In-Depth Information
(
g/L
);
g
= 9.8m/s
2
θ
(
t
)=
θ
max
cos(
ω
o
t
);
ω
o
=
√
Oscillating Pendulum
θ
(
t
)
Equilibrium
t
Equilibrium
Time, sec
(a)
(b)
Fig. 1.1
a Oscillating pendulum, b the displacement signal for the oscillating pendulum
A bird sound
A whale sound
Time, sec
Time, sec
Fig. 1.2
Sounds of animals
2. Profit as a function of time and market variables.
3. Trend of a stock price as a function of time.
4. Brain (EEG), heart (ECG), or eye (EOG) signals.
5. Speech, music, or other naturally occurring sounds (see Fig.
1.2
).
6. Video signals.
7. Atmospheric pressure as a function of time.
8. Unemployment ratio as a function of social, political, and economic variables.
9. Electronic image signals sent from a satellite or space station.
1.1.4 Classification of Signals
A signal can belong to one or more of the following categories.
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