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+# -*- 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}