1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<html> 3 4<head> 5<LINK rel="stylesheet" type="text/css" href="../../CSS/revolution.css"> 6<title>axvpb.pb.src</title> 7<META http-equiv="Content-Type" content="text/html; charset=windows-1252"> 8<META name="GENERATOR" content="IBM WebSphere Studio Homepage Builder Version 6.5.0.0 for Windows"> 9<META http-equiv="Content-Style-Type" content="text/css"> 10</head> 11 12<body> 13 14<h1 align="left">axvpb.pb.src</h1> 15 16 17<h2>C Specification</h2> 18<BLOCKQUOTE> 19<pre><CODE>typedef struct _AXPBSRC 20{ 21 22 u16 ratioHi; // sampling ratio, integer 23 u16 ratioLo; // sampling ratio, fraction 24 u16 currentAddressFrac; // current fractional sample position 25 u16 last_samples[4]; // last 4 input samples 26 27} AXPBSRC;</CODE></pre> 28</BLOCKQUOTE> 29<h2>Description</h2> 30 31<p>The <CODE>SRC</CODE> values specify the operating parameters for the DSP's "front-end" sample rate converter.</p> 32 33<p>Two 16-bit values specify the input-to-output ratio of samples the DSP must generate. The valid range is 1/512 to 4.0000. The <code>ratioHi</code> variable must be programmed with the integer portion of the ratio. The <code>ratioLo</code> variable must be programmed with the fractional portion of the ratio (2^<sup>16</sup> * fraction).</p> 34 35<p>The <code>currentAddressFrac</code> and <code>last_samples[]</code> variables are reserved for use by the DSP and must not be modified by the user, except when setting a voice to run. In this case, the<code> last_samples[]</code> must be set to zero.</p> 36 37<p>Assert the <code>AX_SYNC_USER_SRCRATIO</code> bit in the <code>axvpb.sync</code> member when <code>ratio*</code> is changed.</p> 38 39<p>Assert the <code>AX_SYNC_USER_SRC</code> bit in the <code>axvpb.sync</code> member to synchronize the entire <code>AXPBSRC</code> structure.</p> 40 41<h2>See Also</h2> 42<p> 43<code><a href="../Voice_Parameter_Blocks/sync.html">axvpb.sync</a><br> <a href="../Voice_Parameters/AXSetVoiceSrcType.html">AXSetVoiceSrc</a><br> <a href="../Voice_Parameters/AXSetVoiceSrcRatio.html">AXSetVoiceSrcRatio</a></code> 44</p> 45 46<h2>Revision History</h2> 47 48<P>2006/03/01 Initial version.</P> 49<hr> 50<P>CONFIDENTIAL</p> 51</BODY> 52</HTML> 53