Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
For signals to be processed digitally they must exist as discrete in both time and magnitude. This figure indicates a signal represented at six possible magnitudes on an arbitrary scale. Each signal point is positioned at a specific location in hypothetical time.
