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<h2>
<span class="refentrytitle">hrtfearly</span>
</h2>
<p>hrtfearly —
Generates 3D binaural audio with high-fidelity early reflections in a parametric room using a Phase Truncation algorithm.
</p>
</div>
<div class="refsect1">
<a id="idm281472925773464"></a>
<h2>Description</h2>
<p>
This opcode essentially nests the <a class="link" href="hrtfmove.html" title="hrtfmove"><em class="citetitle">hrtfmove</em></a> opcode in an image model for a user-definable shoebox-shaped room. A default room can be selected, or advanced room parameters can be used. Room surfaces can be controlled with high and low-frequency absorption coefficients and gain factors of a three-band equaliser.
</p>
<p>
Although valid as a stand alone opcode, <span class="emphasis"><em>hrtfearly</em></span> is designed to work with <a class="link" href="hrtfreverb.html" title="hrtfreverb"><em class="citetitle">hrtfreverb</em></a> to provide spatially accurate, dynamic binaural reverberation. A number of sources can be processed dynamically using a number of <span class="emphasis"><em>hrtfearly</em></span> instances. All can then be processed with one instance of <a class="link" href="hrtfreverb.html" title="hrtfreverb"><em class="citetitle">hrtfreverb</em></a>.
</p>
</div>
<div class="refsect1">
<a id="idm281472925697960"></a>
<h2>Syntax</h2>
<pre class="synopsis">aleft, aright, irt60low, irt60high, imfp <span class="command"><strong>hrtfearly</strong></span> asrc, ksrcx, ksrcy, ksrcz, klstnrx, klstnry, klstnrz, \
ifilel, ifiler, idefroom [,ifade, isr, iorder, ithreed, kheadrot, iroomx, iroomy, iroomz, iwallhigh, \
iwalllow, iwallgain1, iwallgain2, iwallgain3, ifloorhigh, ifloorlow, ifloorgain1, ifloorgain2, \
ifloorgain3, iceilinghigh, iceilinglow, iceilinggain1, iceilinggain2, iceilinggain3]</pre>
</div>
<div class="refsect1">
<a id="idm281472925695384"></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" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note">
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<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" 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>idefroom</em></span> - default room, medium (1: 10*10*3), small (2: 3*4*3) or large (3: 20*25*7). Wall details (high coef, low coef, gain1, gain2, gain3): .3, .1, .75, .95, .9. Floor: .6, .1, .95, .6, .35. Ceiling: .2, .1, 1, 1, 1. If 0 is entered, optional room parameters will be read.
</p>
<p>
<span class="emphasis"><em>ifade</em></span> - optional, number of processing buffers for phase change crossfade (default 8). Legal range is 1-24. See <a class="link" href="hrtfmove.html" title="hrtfmove"><em class="citetitle">hrtfmove</em></a>.
</p>
<p>
<span class="emphasis"><em>isr</em></span> - optional, default 44.1kHz, legal values: 44100, 48000 and 96000.
</p>
<p>
<span class="emphasis"><em>iorder</em></span> - optional, order of images processed: higher order: more reflections. Defaults to 1, legal range: 0-4.
</p>
<p>
<span class="emphasis"><em>ithreed</em></span> - optional, process image sources in three dimensions (1) or two (0: default).
</p>
<p>
<span class="emphasis"><em>iroomx</em></span> - optional, x room size in metres, will be read if no valid default room is entered (all below parameters behave similarly). Minimum room size is 2*2*2.
</p>
<p>
<span class="emphasis"><em>iroomy</em></span> - optional, y room size.
</p>
<p>
<span class="emphasis"><em>iroomz</em></span> - optional, z room size.
</p>
<p>
<span class="emphasis"><em>iwallhigh</em></span> - optional, high frequency wall absorption coefficient (all 4 walls are assumed identical). Absorption coefficients will affect reverb time output.
</p>
<p>
<span class="emphasis"><em>iwalllow</em></span> - optional, low frequency wall absorption coefficient.
</p>
<p>
<span class="emphasis"><em>iwallgain1</em></span> - optional, gain on filter centred at 250 Hz (all filters have a Q implying 4 octaves).
</p>
<p>
<span class="emphasis"><em>iwallgain2</em></span> - optional, as above, centred on 1000 Hz.
</p>
<p>
<span class="emphasis"><em>iwallgain3</em></span> - optional, as above, centred on 4000 Hz.
</p>
<p>
<span class="emphasis"><em>ifloorhigh, ifloorlow, ifloorgain1, ifloorgain2, ifloorgain3
</em></span> - as above for floor.
</p>
<p>
<span class="emphasis"><em>
iceilinghigh, iceilinglow, iceilinggain1, iceilinggain2, iceilinggain3
</em></span> - as above for ceiling.
</p>
<p>
<span class="emphasis"><em>ksrcx</em></span> source x location, must be 10 cm inside room. Also, near-field HRTFs are not processed, so source will not change spatially within a 45 cm radius of the listener. These restrictions also apply to location parameters below.
</p>
<p>
<span class="emphasis"><em>ksrcy</em></span> source y location.
</p>
<p>
<span class="emphasis"><em>ksrcz</em></span> source z location.
</p>
<p>
<span class="emphasis"><em>klstnrx, klstnry, klstnrz</em></span> listener location, as above.
</p>
<p>
<span class="emphasis"><em>kheadrot</em></span> - optional, angular value for head rotation.
</p>
<p>
<span class="emphasis"><em>asrc</em></span> - Input/source signal.
</p>
<p>
<span class="emphasis"><em>irt60low</em></span> - suggested low frequency reverb time for later binaural reverb.
</p>
<p>
<span class="emphasis"><em>irt60high</em></span> - as above, for high frequency.
</p>
<p>
<span class="emphasis"><em>imfp</em></span> - mean free path of room, to be used with later reverb.
</p>
</div>
<div class="refsect1">
<a id="idm281472925660984"></a>
<h2>Examples</h2>
<p>
Here is an example of the hrtfearly and hrtfreverb opcodes. It uses the file <a class="ulink" href="examples/hrtfearly.csd" target="_top"><em class="citetitle">hrtfearly.csd</em></a>.
</p>
<div class="example">
<a id="idm281472925658984"></a>
<p class="title">
<strong>Example 402. Example of the htrfearly opcode.</strong>
</p>
<div class="example-contents">
<div class="refsect1">
<a id="idm281472754933048"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select flags here</span>
<span class="c1">; realtime audio out</span>
-o dac
<span class="c1">; file ouput </span>
<span class="c1">; -o hrtf.wav</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
ga<span class="n">src</span> <span class="nb">init</span> <span class="mi">0</span> <span class="c1">;global</span>
<span class="kd">instr</span> <span class="nf">1</span> <span class="c1">;a plucked string, distorted and filtered</span>
i<span class="n">amp</span> <span class="o">=</span> <span class="mi">15000</span>
i<span class="n">cps</span> <span class="o">=</span> <span class="nb">cpspch</span><span class="p">(</span><span class="nb">p4</span><span class="p">)</span>
a<span class="n">1</span> <span class="nb">pluck</span> i<span class="n">amp</span><span class="p">,</span> i<span class="n">cps</span><span class="p">,</span> i<span class="n">cps</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
a<span class="n">dist</span> <span class="nb">distort1</span> a<span class="n">1</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mf">.5</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span>
a<span class="n">filt</span> <span class="nb">moogvcf2</span> a<span class="n">dist</span><span class="p">,</span> <span class="mi">8000</span><span class="p">,</span> <span class="mf">.5</span>
a<span class="n">out</span> <span class="nb">linen</span> a<span class="n">filt</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mf">.01</span>
ga<span class="n">src</span> <span class="o">=</span> ga<span class="n">src</span> <span class="o">+</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">10</span> <span class="c1">;uses output from instr1 as source</span>
<span class="c1">;simple path for source</span>
k<span class="n">x</span> <span class="nb">line</span> <span class="mi">2</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">9</span>
<span class="c1">;early reflections, room default 1</span>
a<span class="n">earlyl</span><span class="p">,</span>a<span class="n">earlyr</span><span class="p">,</span> i<span class="n">rt60low</span><span class="p">,</span> i<span class="n">rt60high</span><span class="p">,</span> i<span class="n">mfp</span> <span class="nb">hrtfearly</span> ga<span class="n">src</span><span class="p">,</span> k<span class="n">x</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s">"hrtf-44100-left.dat"</span><span class="p">,</span> <span class="s">"hrtf-44100-right.dat"</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">;later reverb, uses outputs from above</span>
a<span class="n">revl</span><span class="p">,</span> a<span class="n">revr</span><span class="p">,</span> i<span class="n">del</span> <span class="nb">hrtfreverb</span> ga<span class="n">src</span><span class="p">,</span> i<span class="n">rt60low</span><span class="p">,</span> i<span class="n">rt60high</span><span class="p">,</span> <span class="s">"hrtf-44100-left.dat"</span><span class="p">,</span> <span class="s">"hrtf-44100-right.dat"</span><span class="p">,</span> <span class="mi">44100</span><span class="p">,</span> i<span class="n">mfp</span>
<span class="c1">;delayed and scaled</span>
a<span class="n">latel</span> <span class="nb">delay</span> a<span class="n">revl</span> <span class="o">*</span> <span class="mf">.1</span><span class="p">,</span> i<span class="n">del</span>
a<span class="n">later</span> <span class="nb">delay</span> a<span class="n">revr</span> <span class="o">*</span> <span class="mf">.1</span><span class="p">,</span> i<span class="n">del</span>
<span class="nb">outs</span> a<span class="n">earlyl</span> <span class="o">+</span> a<span class="n">latel</span><span class="p">,</span> a<span class="n">earlyr</span> <span class="o">+</span> a<span class="n">later</span>
ga<span class="n">src</span> <span class="o">=</span> <span class="mi">0</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Play Instrument 1: a simple arpeggio</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mf">.2</span> <span class="mf">8.00</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">.2</span> <span class="mf">8.04</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">.2</span> <span class="mf">8.07</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">.2</span> <span class="mf">8.11</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">.2</span> <span class="mf">9.02</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">1.5</span> <span class="mf">8.11</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">1.5</span> <span class="mf">8.07</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">1.5</span> <span class="mf">8.04</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">1.5</span> <span class="mf">8.00</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mf">1.5</span> <span class="mf">7.09</span>
<span class="nb">i</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">4</span> <span class="mf">8.00</span>
<span class="c1">; Play Instrument 10 for 13 seconds.</span>
<span class="nb">i</span><span class="mi">10</span> <span class="mi">0</span> <span class="mi">13</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<br class="example-break" />
</div>
<div class="refsect1">
<a id="idm281472925657192"></a>
<h2>See Also</h2>
<p>
<a class="link" href="hrtfreverb.html" title="hrtfreverb"><em class="citetitle">hrtfreverb</em></a>
<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="hrtfer.html" title="hrtfer"><em class="citetitle">hrtfer</em></a>.
</p>
</div>
<div class="refsect1">
<a id="idm281472925651256"></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>2011</td>
</tr>
</table>
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</p>
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