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<!-- This file create by Bob L. Sturm Sept 02 2003, using vi. Originally inspired by the MATLAB Auditory Demonstrations package created by Univ. of Sheffield, UK.--><HTML><HEAD> <TITLE>SSUM: Sampling Explorer</TITLE> <link href="style.css" rel="stylesheet" type="text/css"></HEAD><BODY><table cellpadding=0 cellspacing=0 align=center border=0 width="100%"><tr> <td> <IMG SRC="samplexpo_t.gif" WIDTH=137 HEIGHT=146> </td> <td align=center> <H1>Sampling Explorer</H1> </td></tr><tr> <td colspan=2 align=center bgcolor=black> <H6><A HREF="#introduction">Introduction</A> <A HREF="#demonstration">Demo</A> <A HREF="#investigate">Investigate</A> <A HREF="#reading">Reading</A> <A HREF="#credits">Credits</A> <A HREF="SSUM.htm">Home</A></H6> </td></tr></table><br><A NAME="introduction"></A><H2>Introduction</H2><P>This is a visual demonstration of sampling analog signals, including timesampling, quantization, and interpolation of the samples.</p><br><A NAME="demonstration"></A><H2>The tool</H2><P>The original analog signal is the blue line in the top plot. Its samples aredenoted by the stems, or lollypops. The dark blue line in the bottom plot isthe interpolation of the samples back to a continuous signal. You can choosedifferent analog signals from the waveform menu at the bottom.</p><br><CENTER><IMG SRC="samplexpo.gif"></CENTER><br><A NAME="investigate"></A><H2>Things to investigate</H2><OL> <LI>For a sampling rate of 1000 Hz, what is the highest frequency sinewave that can be sampled accurately? <LI>Set the number of periods to plot to 5. Set the sinewave frequency to500 Hz, and the sampling rate to 1000 Hz. What happened? Now click on the phaseslider arrow until it reaches 90 degrees. Interesting... <LI>Set the number of periods to plot to 2, the sinewave frequency to 200, the amplitude to 1, phase to 0, and the sampling rate to 1000. What is happening at the edges? Change the number of periods to 3, 4, 5. Explain by aid of the interpolation button.</OL><A NAME="reading"></A><H2>Further reading</H2><br><A NAME="credits"></a><H2>Credits</H2><hr noshade><br><P class="credits">Produced by Bob L. Sturm and Dr. Jerry Gibson.<br>Release date: January 20, 2004<br>Copyright 2003 University of California, Santa Barbara</p></BODY></HTML>⌨️ 快捷键说明
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