LTI FIR filters are used to process images, thus demonstrating
that low-pass filtering is blurring, while high-pass filtering
will sharpen edges.
DLTIDemo is a program that illustrates the relationship between the input
and output of a discrete-time linear time-invariant (LTI) filter
when the input is a sinusoidal function.
The user is allowed to control the parameters of both the input sinusoid and the digital filter.
A brief introduction to FIR filters and how they
can change the sound of speech signals.