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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: Sonogram 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="sonoexpo_t.jpg" WIDTH=137 HEIGHT=146 > </td> <td align=center> <H1>Sonogram 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 application displays spectral information using a sonogram, or short-timeFourier Transform (STFT). You can explore the effects of different window shapes and sizes on the resolution of the STFT.</p><br><A NAME="demonstration"></A><H2>The tool</H2><P>Simply load a soundfile from the menu to see its STFT. Change the colormapand dB scale to see different features. Zooming in the waveform time-display will also zoom the sonogram. The play button will play only the portion showing.The "Interpolate" box will smooth the STFT, but this will take a longtime to complete for large sounds. The slider to the left of the sonogramwill scale the frequency axis.</p><br><p>The 'Explore Data' allows one to travel the partials in the sonogram to getdetailed information about its frequency and amplitude envelopes, and thetime information. These can be used with the additive synthesis programto attempt to synthesize the sound. This works especially well with birdsong(see <a href="birds.htm">Additive Synthesis Forest</a>). Click the "explore"button (perhaps twice if there is an error), and click on the sonogram toget information about the partial frequency, time, and amplitude. Once finishedhit enter to have this information displayed to the MATLAB command window.</p><br><CENTER><a href="sonoexpo.jpg"><IMG SRC="sonoexpo.jpg" width=850 height=473></a></CENTER><br><A NAME="investigate"></A><H2>Things to investigate</H2><OL> <LI>What happens to the frequency resolution and time resolution as the analysis window size increases? <LI>How can you tell the difference between speech and other types of sounds using the sonogram?</OL><A NAME="reading"></A><H2>Further reading</H2><br><A NAME="credits"></a><H2>Credits</H2><hr noshade><P class="credits">Produced by Bob L. Sturm and Dr. Jerry Gibson<br>Release date: August 1, 2004<br>Copyright 2004 University of California, Santa Barbara</p></BODY></HTML>⌨️ 快捷键说明
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