Diagrama de flujo

1. Signals Introduction Part 1

Savan L Electronic and Electrical Engineering First year Inglés

Contenido del diagrama

Signals Basics
Signal
Information
Created when a value changes with time
Created when a signal changes in an unpredictable way
Side Notes
An electrical/electronic circuit is some sort of signal processor
Any value that changes as a function of time
A switch can create a signal
The Unit Step can represent this simple signal
There's an infinite number of signals
Some aspects of signals - can be used to classify them
Amplitude
Mean value (might be zero)
Root mean square value (will not be zero)
Number of zero crossings per unit time
Related to frequency
Important
Electronic devices take an input signal and change it in some way
Examples:
Amplification
Rectification
Filtering
Fundamental Signal Classifications
Continuous Signal
Has a value at every point in time
Discrete Time Signal
Has a value at distinct points in time
T is the time between the signal values (not the time period) in this case
Signals can be created by summing other signals
Simple signals, such as sine waves, are added to create more complicated wave-forms - information signals (maybe)
Adding continuous signals
Adding discrete time signals
Periodic
Random
Non-periodic, Not Random
Values are repeated at regular intervals (periods)
Random value (can't be determined) at any point in time
Values are not repeated periodically and are not random
T = Period
Continuous Signals
Random Signal
Discrete Random Signals
Non-Periodic, Not Random Signal
Odd
Even
x(t) = x(-t)
x(t) = -x(-t)
Symmetric
Anti-symmetric
(Cosine Wave)
(Sine Wave)
Signal Symmetry
Product Rule
ODD . ODD = EVEN
EVEN . EVEN = EVEN
EVEN . ODD = ODD
ODD . EVEN = ODD