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<h2>
<span class="refentrytitle">hrtfer</span>
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<p>hrtfer —
Creates 3D audio for two speakers.
</p>
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<div class="refsect1" title="Description">
<a id="idp25859040"></a>
<h2>Description</h2>
<p>
Output is binaural (headphone) 3D audio.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp25859696"></a>
<h2>Syntax</h2>
<pre class="synopsis">aleft, aright <span class="command"><strong>hrtfer</strong></span> asig, kaz, kelev, <span class="quote">“<span class="quote">HRTFcompact</span>”</span></pre>
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<div class="refsect1" title="Initialization">
<a id="idp25870496"></a>
<h2>Initialization</h2>
<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 under horizontal.
</p>
<p>
At present, the only file which can be used with <span class="emphasis"><em>hrtfer</em></span> is <a class="ulink" href="examples/HRTFcompact" target="_top"><em class="citetitle">HRTFcompact</em></a>. It must be passed to the opcode as the last argument within quotes as shown above.
</p>
<p>
HRTFcompact may also be obtained via anonymous ftp from: <a class="ulink" href="ftp://ftp.cs.bath.ac.uk/pub/dream/utilities/Analysis/HRTFcompact" target="_top"><em class="citetitle">ftp://ftp.cs.bath.ac.uk/pub/dream/utilities/Analysis/HRTFcompact</em></a>
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp25934408"></a>
<h2>Performance</h2>
<p>
These unit generators place a mono input signal in a virtual 3D space around the listener by convolving the input with the appropriate HRTF data specified by the opcode's azimuth and elevation values. <span class="emphasis"><em>hrtfer</em></span> allows these values to be k-values, allowing for dynamic spatialization. <span class="emphasis"><em>hrtfer</em></span> can only place the input at the requested position because the HRTF is loaded in at i-time (remember that currently, CSound has a limit of 20 files it can hold in memory, otherwise it causes a segmentation fault). The output will need to be scaled either by using <a class="link" href="balance.html" title="balance"><em class="citetitle">balance</em></a> or by multiplying the output by some scaling constant.
</p>
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<th align="left">Note</th>
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<td align="left" valign="top">
<p>
The sampling rate of the orchestra must be 44.1kHz. This is because 44.1kHz is the sampling rate at which the HRTFs were measured. In order to be used at a different rate, the HRTFs would need to be re-sampled at the desired rate.
</p>
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<div class="refsect1" title="Examples">
<a id="idp25937368"></a>
<h2>Examples</h2>
<p>
Here is an example of the hrtfer opcode. It uses the file <a class="ulink" href="examples/hrtfer.csd" target="_top"><em class="citetitle">hrtfer.csd</em></a>, <a class="ulink" href="examples/HRTFcompact" target="_top"><em class="citetitle">HRTFcompact</em></a>, and <a class="ulink" href="examples/beats.wav" target="_top"><em class="citetitle">beats.wav</em></a>.
</p>
<div class="example">
<a id="idp25939192"></a>
<p class="title">
<strong>Example 339. Example of the hrtfer opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o hrtfer.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</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
<span class="oblock">instr</span> 1
kaz <span class="opc">linseg</span> 0, p3, <span class="op">-</span>360 <span class="comment">; move the sound in circle</span>
kel <span class="opc">linseg</span> <span class="op">-</span>40, p3, 45 <span class="comment">; around the listener, changing</span>
<span class="comment">; elevation as its turning</span>
asrc <span class="opc">soundin</span> "beats.wav"
aleft,aright <span class="opc">hrtfer</span> asrc, kaz, kel, "HRTFcompact"
aleftscale <span class="op">=</span> aleft <span class="op">*</span> 200
arightscale <span class="op">=</span> aright <span class="op">*</span> 200
<span class="opc">outs</span> aleftscale, arightscale
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp25941464"></a>
<h2>See Also</h2>
<p>
<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>.
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp25943456"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Authors: Eli Breder and David MacIntyre</td>
</tr>
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<td>Montreal</td>
</tr>
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<td>1996</td>
</tr>
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<p>
</p>
<p>Fixed the example thanks to a message from Istvan Varga.</p>
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