Unit-impulse signal
Delta function. Is 1 at 0 and 0 everywhere else
Unit Step
function with zero amplitude at neg. values and one amplitude at pos. values.
Shifted sequences
samples that are shifted relative to its position
Sinusod
Curve represented as cos or sin function
Exponential Signal
Signal that "ramps up" or gradually decreases
Linear System
System in which homogeneity and has superposition
Homogenity
Input/Output is multiplied by the same constant
Superposition
input/output is the same as if one had put each signal through the filter separately and then added the outputs
Time invariance
System will behave the same way regardless when the input is applied
Casuality
Reference past points in time for the ouput
Difference Equation
A formula to compute a output sample from past and present inputs
Impulse Response
A Linear-Time-Invariant system by its unit-impulse response
Digital Convolution
Combining two signals into one signal
Stability
A stable system is one for which every bounded input produces a bounded output (BIBO)