% Create own Glossary
\newglossary{symbols}{sym}{sbl}{List of Symbols}
%
\newglossaryentry{error_signal}{
  name = $e$ ,
  description = Error signal,
  sort = e,
  type = symbols,
}
\newglossaryentry{x_sample}{
  name = $x$ ,
  description = Desired signal,
  sort = x,
  type = symbols,
}
\newglossaryentry{filtered_x}{
  name = $x'$ ,
  description = Error signal measured at microphone,
  sort = xapostrophe,
  type = symbols,
}