<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>hrtfmove2</title>
<link rel="stylesheet" type="text/css" href="csound.css" />
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1" />
<link rel="home" href="index.html" title="The Canonical Csound Reference Manual" />
<link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" />
<link rel="prev" href="hrtfmove.html" title="hrtfmove" />
<link rel="next" href="hrtfreverb.html" title="hrtfreverb" />
</head>
<body>
<div class="navheader">
<table width="100%" summary="Navigation header">
<tr>
<th colspan="3" align="center">hrtfmove2</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="hrtfmove.html">Prev</a> </td>
<th width="60%" align="center">Orchestra Opcodes and Operators</th>
<td width="20%" align="right"> <a accesskey="n" href="hrtfreverb.html">Next</a></td>
</tr>
</table>
<hr />
</div>
<div class="refentry" title="hrtfmove2">
<a id="hrtfmove2"></a>
<div class="titlepage"></div>
<a id="IndexHrtfmove2" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">hrtfmove2</span>
</h2>
<p>hrtfmove2 —
Generates dynamic 3d binaural audio for headphones using a Woodworth based spherical head model
with improved low frequency phase accuracy.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp26022712"></a>
<h2>Description</h2>
<p>
This opcode takes a source signal and spatialises it in the 3 dimensional space around a listener
using head related transfer function (HRTF) based filters.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp26077104"></a>
<h2>Syntax</h2>
<pre class="synopsis">aleft, aright <span class="command"><strong>hrtfmove2</strong></span> asrc, kAz, kElev, ifilel, ifiler [,ioverlap, iradius, isr]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp26078192"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ifilel</em></span> -- left HRTF spectral data file
</p>
<p>
<span class="emphasis"><em>ifiler</em></span> -- right HRTF spectral data file
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
Spectral datafiles (based on the MIT HRTF database) are available in 3 different sampling rates: 44.1, 48 and 96 khz and are labelled accordingly. Input and processing <span class="emphasis"><em>sr</em></span> should match datafile <span class="emphasis"><em>sr</em></span>. Files should be in the current directory or the SADIR (see <a class="link" href="CommandEnvironment.html" title="Csound Environment Variables"><em class="citetitle">Environment Variables</em></a>).
</p>
</td>
</tr>
</table>
</div>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
HRTF Data files for use with
<a class="link" href="hrtfmove.html" title="hrtfmove"><em class="citetitle">hrtfmove</em></a>,
<a class="link" href="hrtfmove2.html" title="hrtfmove2"><em class="citetitle">hrtfmove2</em></a>,
<a class="link" href="hrtfstat.html" title="hrtfstat"><em class="citetitle">hrtfstat</em></a>,
<a class="link" href="hrtfearly.html" title="hrtfearly"><em class="citetitle">hrtfearly</em></a>,
<a class="link" href="hrtfreverb.html" title="hrtfreverb"><em class="citetitle">hrtfreverb</em></a>
were updated for Csound 5.15 and later (the code was updated and is more efficient). Old datafiles are now deprecated.
</p>
</td>
</tr>
</table>
</div>
<p>
<span class="emphasis"><em>ioverlap</em></span> -- optional, number of overlaps for STFT processing (default 4). See STFT section of manual.
</p>
<p>
<span class="emphasis"><em>iradius</em></span> -- optional, head radius used for phase spectra calculation in centimeters (default 9.0)
</p>
<p>
<span class="emphasis"><em>isr</em></span> - optional, default 44.1kHz, legal values: 44100, 48000 and 96000.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp26085504"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asrc</em></span> -- Input/source signal.
</p>
<p>
<span class="emphasis"><em>kAz</em></span> -- azimuth value in degrees. Positive values represent position on the right, negative values are positions on the left.
</p>
<p>
<span class="emphasis"><em>kElev</em></span> -- elevation value in degrees. Positive values represent position above horizontal, negative values are positions below horizontal (min -40).
</p>
<p>
Artifact-free user-defined trajectories are made possible using an interpolation algorithm based on spectral
magnitude interpolation and a derived phase spectrum based on the Woodworth spherical head model.
Accuracy is increased for the data set provided by extracting and applying a frequency dependent scaling factor
to the phase spectra, leading to a more precise low frequency interaural time difference.
Users can control head radius for the phase derivation, allowing a crude level of individualisation.
The dynamic source version of the opcode uses a Short Time Fourier Transform algorithm to avoid artefacts
caused by derived phase spectra changes. STFT processing means this opcode is more computationally intensive
than <a class="link" href="hrtfmove.html" title="hrtfmove"><em class="citetitle">hrtfmove</em></a> using phase truncation, but phase is constantly updated by <span class="emphasis"><em>hrtfmove2</em></span>.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp26089152"></a>
<h2>Examples</h2>
<p>
Here is an example of the hrtfmove2 opcode. It uses the file <a class="ulink" href="examples/hrtfmove2.csd" target="_top"><em class="citetitle">hrtfmove2.csd</em></a>.
</p>
<div class="example">
<a id="idp26090208"></a>
<p class="title">
<strong>Example 342. Example of the htrfmove2 opcode.</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select flags here</span>
<span class="comment">; realtime audio out </span>
-o dac
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o hrtf.wav</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
gasrc <span class="opc">init</span> 0
<span class="oblock">instr</span> 1 <span class="comment">;a plucked string</span>
kamp <span class="op">=</span> p4
kcps <span class="op">=</span> <span class="opc">cpspch</span>(p5)
icps <span class="op">=</span> <span class="opc">cpspch</span>(p5)
a1 <span class="opc">pluck</span> kamp, kcps, icps, 0, 1
gasrc <span class="op">=</span> a1
<span class="oblock">endin</span>
<span class="oblock">instr</span> 10 <span class="comment">;uses output from instr1 as source</span>
kaz <span class="opc">linseg</span> 0, p3, 720 <span class="comment">;2 full rotations</span>
aleft,aright <span class="opc">hrtfmove2</span> gasrc, kaz,0, "hrtf<span class="op">-</span>44100<span class="op">-</span>left.dat","hrtf<span class="op">-</span>44100<span class="op">-</span>right.dat"
<span class="opc">outs</span> aleft, aright
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument 1: a simple arpeggio</span>
<span class="stamnt">i</span>1 0 .2 15000 8.00
<span class="stamnt">i</span>1 + .2 15000 8.04
<span class="stamnt">i</span>1 + .2 15000 8.07
<span class="stamnt">i</span>1 + .2 15000 8.11
<span class="stamnt">i</span>1 + .2 15000 9.02
<span class="stamnt">i</span>1 + 1.5 15000 8.11
<span class="stamnt">i</span>1 + 1.5 15000 8.07
<span class="stamnt">i</span>1 + 1.5 15000 8.04
<span class="stamnt">i</span>1 + 1.5 15000 8.00
<span class="stamnt">i</span>1 + 1.5 15000 7.09
<span class="stamnt">i</span>1 + 1.5 15000 8.00
<span class="comment">; Play Instrument 10 for 10 seconds.</span>
<span class="stamnt">i</span>10 0 10
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<br class="example-break" />
</div>
<div class="refsect1" title="See Also">
<a id="idp26091160"></a>
<h2>See Also</h2>
<p>
<a class="link" href="hrtfmove.html" title="hrtfmove"><em class="citetitle">hrtfmove</em></a>,
<a class="link" href="hrtfstat.html" title="hrtfstat"><em class="citetitle">hrtfstat</em></a>,
<a class="link" href="hrtfer.html" title="hrtfer"><em class="citetitle">hrtfer</em></a>.
</p>
<p> More information on this opcode: <a class="ulink" href="http://www.csounds.com/journal/issue9/newHRTFOpcodes.html" target="_top"><em class="citetitle">http://www.csounds.com/journal/issue9/newHRTFOpcodes.html</em></a> , written by Brian Carty </p>
</div>
<div class="refsect1" title="Credits">
<a id="idp26093920"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Brian Carty</td>
</tr>
<tr>
<td>Maynooth</td>
</tr>
<tr>
<td>2008</td>
</tr>
</table>
<p>
</p>
</div>
</div>
<div class="navfooter">
<hr />
<table width="100%" summary="Navigation footer">
<tr>
<td width="40%" align="left"><a accesskey="p" href="hrtfmove.html">Prev</a> </td>
<td width="20%" align="center">
<a accesskey="u" href="OpcodesTop.html">Up</a>
</td>
<td width="40%" align="right"> <a accesskey="n" href="hrtfreverb.html">Next</a></td>
</tr>
<tr>
<td width="40%" align="left" valign="top">hrtfmove </td>
<td width="20%" align="center">
<a accesskey="h" href="index.html">Home</a>
</td>
<td width="40%" align="right" valign="top"> hrtfreverb</td>
</tr>
</table>
</div>
</body>
</html>
distrib
>
Mageia
>
5
>
x86_64
>
media
>
core-release
>
by-pkgid
>
b707d9a4ee443103660a75ccb6e51334
>
files
>
1793
