- Analog signal - signal intensity varies in a smooth fashion over time
No breaks or discontinuities in the signal
- Digital signal - signal intensity maintains a constant level for some period of time and then changes to another constant level
- Periodic signal - analog or digital signal pattern that repeats over time
s(t +T ) = s(t ) -¥<>
where T is the period of the signal
- Aperiodic signal - analog or digital signal pattern that doesn't repeat over time
- Peak amplitude (A) - maximum value or strength of the signal over time; typically measured in volts
- Frequency (f )
Rate, in cycles per second, or Hertz (Hz) at which
the signal repeats
- Period (T ) - amount of time it takes for one repetition of the signal
T = 1/f
- Phase (f) - measure of the relative position in time within a single period of a signal
- Wavelength (l) - distance occupied by a single cycle of the signal
Or, the distance between two points of corresponding phase of two consecutive cycles
