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changeset 8:dead657aaa44

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Merge
author Michael T iMac <Michael.Terrell@eecs.qmul.ac.uk>
date Mon, 07 Oct 2013 09:14:16 +0100
parents 5a63aa0913ef (diff) dfd61fe556d5 (current diff)
children d29e51dee45a d780cb4fa37f
files
diffstat 11 files changed, 1125 insertions(+), 99 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lectures/Lec3 - Audio Chain/Figures/Nyquist.svg	Mon Oct 07 09:14:16 2013 +0100
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Binary file Lectures/Lec3 - Audio Chain/Figures/NyquistLarge.pdf has changed
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--- a/Lectures/Lec3 - Audio Chain/Lec3 - Audio Signal Chain.nav	Mon Sep 30 12:07:23 2013 +0100
+++ b/Lectures/Lec3 - Audio Chain/Lec3 - Audio Signal Chain.nav	Mon Oct 07 09:14:16 2013 +0100
@@ -95,8 +95,12 @@
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 \headcommand {\slideentry {1}{1}{46}{46/46}{ Audio Signal Chain}{0}}
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+\headcommand {\slideentry {1}{1}{47}{47/47}{ Audio Signal Chain}{0}}
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+\headcommand {\slideentry {1}{1}{48}{48/48}{ Audio Signal Chain}{0}}
+\headcommand {\beamer@framepages {48}{48}}
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Binary file Lectures/Lec3 - Audio Chain/Lec3 - Audio Signal Chain.pdf has changed
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--- a/Lectures/Lec3 - Audio Chain/Lec3 - Audio Signal Chain.tex	Mon Sep 30 12:07:23 2013 +0100
+++ b/Lectures/Lec3 - Audio Chain/Lec3 - Audio Signal Chain.tex	Mon Oct 07 09:14:16 2013 +0100
@@ -44,7 +44,7 @@
 	\frametitle{Signal Chains}
 	\begin{itemize}\itemsep10pt
 		\item The signal chain describes all links in the chain from the sound source to the receiver.
-		\item Each component will have it's own {\bf Impulse Response} and related {\bf Frequency Response}.
+		\item Each component will have it's own {\bf Frequency Response}.
 		\item It is very hard to recreate a sound source accurately.
 	\end{itemize}
 \end{frame}
@@ -186,8 +186,7 @@
 	\frametitle{Sound Reinforcement Signal Chain}
 	\begin{itemize}\itemsep10pt
 		\item In live music we have many sources and many receivers (listeners).
-		\item Things can get very complicated very quickly!
-		\item Take a look at my paper on live music production on the QM+ page.
+		\item Things can get very complicated very quickly...!
 	\end{itemize}
 \end{frame}
 
@@ -302,11 +301,32 @@
 	\item The frequency response of any sampled signal will be a mirror image about the middle frequency.
 	\end{itemize}
 	\begin{figure}
-	\includegraphics[width=1 \textwidth]{Figures/nyquist.pdf}
+	\includegraphics[width=.8\textwidth]{Figures/Nyquist.pdf}
 	\end{figure}
 \end{frame}
 
 \begin{frame}
+	\frametitle{A-D conversion: Aliasing}
+	\begin{itemize}
+	\item The mirror images continue as the frequency increases.
+	\end{itemize}
+	\begin{figure}
+	\includegraphics[width=\textwidth]{Figures/NyquistLarge.pdf}
+	\end{figure}
+\end{frame}
+
+\begin{frame}
+	\frametitle{A-D conversion: Aliasing}
+	\begin{itemize}
+	\item To avoid aliasing effects, only the first portion of the frequency spectrum can be used.
+	\end{itemize}
+	\begin{figure}
+	\includegraphics[width=\textwidth]{Figures/NyquistLarge2.pdf}
+	\end{figure}
+\end{frame}
+
+
+\begin{frame}
 
 	\begin{itemize}
 	\item The Nyquist frequency is equal to half the sample rate, for CD audio this is 22.05kHz.
@@ -315,7 +335,7 @@
 	\item The frequency response above the Nyquist frequency is a mirror image of the response below.
 	\end{itemize}
 	\begin{itemize}
-	\item The signal is filtered using an analogue low pass filter before ADC to remove all components of the signal which are above the Nyquist freqency.
+	\item The signal is filtered using an analogue low pass filter before ADC, and digital filter after, to remove all components of the signal which are above the Nyquist freqency.
 	\end{itemize}
 	\end{frame}
 
@@ -411,7 +431,7 @@
 \begin{frame}
 	\frametitle{Latency}
 	\begin{itemize}\itemsep12pt
-		\item Latency is a huge pain and a massive disadvantage of digital recording.
+		\item Latency is an unavoidable disadvantage of digital recording.
 		\item Reducing buffer size will reduce the latency but will increase the processing load on the computer.
 		\item Direct monitoring of the analogue input is the only way to completely remove latency when recording.
 	\end{itemize}