From fe20e9b04de06f5e06380fa20d9226399ebd5580 Mon Sep 17 00:00:00 2001
From: David Runge <dave@sleepmap.de>
Date: Mon, 3 Jul 2017 20:26:15 +0200
Subject: thesis/thesis.tex: Elaborating further on wfs subsection. Adding
 phantom section for references in toc.

---
 thesis/thesis.tex | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/thesis/thesis.tex b/thesis/thesis.tex
index 1fe2ac5..62bbc07 100644
--- a/thesis/thesis.tex
+++ b/thesis/thesis.tex
@@ -327,15 +327,25 @@ parskip=never]{paper}
 
       \subsubsection{Wave Field Synthesis}
         \label{subsubsec:wavefieldsynthesis}
-        \gls{wfs} describes a spatial technique for rendering audio. As such it
-        aims at synthesizing a sound field of desired acoustic preference in a
-        given listening area, assuming a planar reproduction to be most
-        suitable for most applications.\\
-        \gls{wfs} is typically implemented using a circular, rectangular or
-        linear loudspeaker array surrounding or fronting the listening area.\\
-        Several free and open-source renderer applications exist for \gls{wfs}
-        environments, with varying stages of feature richness.\\
-
+        \gls{wfs} is a spatial audio rendering technique, which is based on the
+        Huygens-Fresnel principle. It states that any wave front can be
+        synthesized by the superposition of elementary spherical waves.\\
+        Setups mainly focus on horizontal, preferably spatially discrete,
+        speaker arrays of rectangular or circular shape, as the human hearing
+        is most capable to localize acoustic sources in this this plane.\\
+        According to \citep{HagenWierstorf1899}, localization is accurately and
+        evenly distributed in the listening area with loudspeaker spacings of
+        up to 40cm.\\
+        Although \gls{wfs} does not suffer from a pronounced sweet spot and
+        spatial aliasing is distributed over a relatively large listening area,
+        compared to e.g.\ \gls{nfc-hoa}, the spatial sampling artifacts may
+        still be perceived as coloration of the sound field, which can be
+        improved by prefiltering especially high-frequency content
+        \citep{HelmutWittek1900}.\\
+        Due to the relatively high amount of loudspeakers (and thereby
+        computing power to calculate as many audio channels) needed for a
+        medium to large-scale setup, \gls{wfs} is not yet very widely
+        distributed.
 
     \subsection{sWONDER}
       \label{subsec:swonder}
@@ -424,7 +434,9 @@ parskip=never]{paper}
       The \gls{ssr}, written in C++, is a multi-purpose spatial audio renderer,
       that runs on Linux and MacOSX\@. Based on its underlying \gls{apf}
       \citep{MatthiasGeierTorbenHohn1890}, it is able to use \gls{bs},
-      \gls{brs}, \gls{aap}, \gls{wfs}, \gls{hoa} and \gls{vbap}.\\
+      \gls{brs}, \gls{aap}, \gls{wfs}, \gls{nfc-hoa} and \gls{vbap}. However,
+      all rendering algorithms with potentially orthogonal sound fields, are
+      currently only available in 2D \citep{MatthiasGeier1888}.\\
       It can be used with a \gls{qt4} based \gls{gui} or headless (without
       one), depicting the virtual sources, their volumes and positions. If a
       loudspeaker based renderer is chosen, the \gls{gui} also illustrates
@@ -1816,6 +1828,8 @@ ssr-aap -N “server” -C “127.0.0.1:50002”
   \cleardoublepage
   \appendix
   \cleardoublepage
+  \phantomsection
+  \addcontentsline{toc}{section}{References}
   \bibliographystyle{plainnat}
   \bibliography{../bib/ssr-networking}
 \end{document}
-- 
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