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9<title>AX Low Pass Filter Demo</title>
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14<h1 align="left">axfilter</h1>
15
16<h2>Description</h2>
17<p>This program demonstrates the use of the AX Low Pass Filter. This new per-voice, one-pole, low-pass filter is implemented on the DSP for minimal impact on the CPU. Low-pass filters are used to shape the frequency response of the audio signal by removing the high-frequency content. This is commonly used to muffle sound to simulate obstructed emitters.</p>
18<p>Each sound can be set to start with or without a loop. Also the AX compressor can be enabled and an AX effect can be added to the AuxA bus. The AX low pass filter cut off frequency (between 80 and 16,000 Hz) can be modified by moving the Y coordinates up and down with the C Stick.</p>
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20<h2>Coverage</h2>
21<ul TYPE="DISC">
22  <li>AX initialization</li>
23  <li>Getting and freeing voices.</li>
24  <li>Handling dropped voices.</li>
25  <li>Toggling the AX compressor</li>
26  <li>Selecting AX Aux effects</li>
27  <li>Managing sample data with the AX Sound Pipeline</li>
28  <li>Initializing a low pass filter for an acquired voice.</li>
29  <li>Modifying the low pass filter cutoff frequency for an acquired voice.</li>
30  <li>Toggling the AX low pass filter</li>
31</ul>
32
33<h2>Using the Demo</h2>
34In the <B>AX Low Pass Filter Demo</B> window:
35<ul TYPE="DISC">
36  <li>Use the +Control Pad or the Control Stick to move the menu selection up and down.</li>
37  <li>Use the A Button to select a menu item.</li>
38  <li>C Stick movement up and down changes the filter cut off frequency.</li>
39</ul>
40
41<h2>Required Data Files</h2>
42<ul TYPE="DISC">
43  <li><CODE>//axdemo/filter/lpfdemo.spd</CODE></li>
44  <li><CODE>//axdemo/filter/lpfdemo.spt</CODE></li>
45</ul>
46
47<H2>Revision History</H2>
48<P>
492008/08/28 Revised terminology.<br>2006/03/01 Initial version.<BR>
50</P>
51
52<hr><p>CONFIDENTIAL</p></body>
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