# -*- mode: org; -*-

#+TITLE: Amplitude-shift keying
#+SUBTITLE: A simple method for representing digital data.
#+AUTHOR: Marius Peter
#+DATE: <2022-04-05 Tue>

#+DESCRIPTION: Amplitude-shift keying: a simple method for representing digital data.
#+MACRO: ASK amplitude-shift keying


#+begin_abstract
Amplitude-shift keying enables the representation of digital data as a
function of a carrier wave's amplitude. The earliest example of ASK
was the [[file:morse-code.org][Morse code]], implemented as an electrical switch the operator
could close to produce an audible tone for the listener at the other
end of the line.
#+end_abstract


\begin{equation}
e^{j\theta} = \cos(\theta) + j\sin(\theta)
\end{equation}