Signals
What are signals How do signals look like About
Signals

Definition

Signals are used to encode data so that they can be tramsmitted across a transmission medium. Sound is an example of a signal. When you speak a word, the vocal cords vibrate to produce the sound that corresponds to the word. Signals are represented as waves.

Types of Signal

  • Analog Signal Infinitely many levels of intensity of over a period of time
  • Digital Signal Have a limited number of defined values (1 or 0)
  • Periodic Signal Completes a pattern within a measurable time frame (period)
  • Periodic Composite Signal Signals with discrete frequencies
  • Non-periodic Signal Signals with continuous frequencies

Forms and Parts of Periodic Analog Signal

Sine Wave
Most fundamental form of a periodic analog
Peak amplitude
Absolute value of signal's highest intensity, proportional to the energy it carries
Period (T)
Amount of time in seconds to complete a cycle
Frequency (f)
Number of period/cycles in 1 sec (hertz/hZ). If signal does not change, f is 0. If signal changes instanteneously, f is infinite
Phase
Position of waveform relative to time 0
Wavelength (λ)
Binds T or f of a simple sine wave to the propagation speed of the medium. λ - cT = c/f
where c = propagation speed of light = 3 x 10^8 m/s
unit is in micrometers (microns)
Input is not a number! Input the strength of the signal(max is 3)
Input is not a number! Input the frequency
Input is not a number! Input the phase angle in degrees
Input is not a number! Input the number of frequency components to show
Input is not a number! Input the number of frequency components to show

Signals

Amplitude Frequency Phase Frequency Component
This module is part of KROWNET.
Contributors:
  • Joseph Anthony C. Hermocilla
  • Frederick S. Escobar
  • Ralph Lawrence R. Silaya
Resources:
  • http://www.technologyuk.net/telecommunications/telecom-principles/
  • https://learn.digilentinc.com/Documents/Topics/Periodic_Signals
  • https://datacommandnet.blogspot.com/p/periodic-analog-signals.html
  • https://mathematica.stackexchange.com/questions/65883/crosscorrelation-for-nonperiodic-signals