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<a href="#libinstpatch-IpatchUnit-SF2.description" class="shortcut">Description</a>
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<div class="refentry" title="IpatchUnit_SF2">
<a name="libinstpatch-IpatchUnit-SF2"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libinstpatch-IpatchUnit-SF2.top_of_page"></a>IpatchUnit_SF2</span></h2>
<p>IpatchUnit_SF2 — Unit types and conversions for SoundFont</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1" title="Stability Level">
<a name="libinstpatch-IpatchUnit-SF2.stability-level"></a><h2>Stability Level</h2>
Stable, unless otherwise indicated
</div>
<div class="refsynopsisdiv" title="Synopsis">
<a name="libinstpatch-IpatchUnit-SF2.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-abs-pitch-to-dls-abs-pitch"
>ipatch_unit_sf2_abs_pitch_to_dls_abs_pitch</a>
(int sf2_abs_pitch);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-dls-abs-pitch-to-sf2-abs-pitch"
>ipatch_unit_dls_abs_pitch_to_sf2_abs_pitch</a>
(int dls_abs_pitch);
double <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-abs-pitch-to-hertz"
>ipatch_unit_sf2_abs_pitch_to_hertz</a> (int sf2_abs_pitch);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-hertz-to-sf2-abs-pitch"
>ipatch_unit_hertz_to_sf2_abs_pitch</a> (double hz);
double <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-ofs-pitch-to-multiplier"
>ipatch_unit_sf2_ofs_pitch_to_multiplier</a>
(int sf2_ofs_pitch);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-multiplier-to-sf2-ofs-pitch"
>ipatch_unit_multiplier_to_sf2_ofs_pitch</a>
(double multiplier);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-abs-time-to-dls-abs-time"
>ipatch_unit_sf2_abs_time_to_dls_abs_time</a>
(int sf2_abs_time);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-dls-abs-time-to-sf2-abs-time"
>ipatch_unit_dls_abs_time_to_sf2_abs_time</a>
(int dls_abs_time);
double <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-abs-time-to-seconds"
>ipatch_unit_sf2_abs_time_to_seconds</a> (int sf2_abs_time);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-seconds-to-sf2-abs-time"
>ipatch_unit_seconds_to_sf2_abs_time</a> (double sec);
double <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-ofs-time-to-multiplier"
>ipatch_unit_sf2_ofs_time_to_multiplier</a>
(int sf2_ofs_time);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-multiplier-to-sf2-ofs-time"
>ipatch_unit_multiplier_to_sf2_ofs_time</a>
(double multiplier);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-centibels-to-dls-gain"
>ipatch_unit_centibels_to_dls_gain</a> (int centibel);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-dls-gain-to-centibels"
>ipatch_unit_dls_gain_to_centibels</a> (int dls_gain);
double <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-centibels-to-decibels"
>ipatch_unit_centibels_to_decibels</a> (int cb);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-decibels-to-centibels"
>ipatch_unit_decibels_to_centibels</a> (double db);
double <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-tenth-percent-to-percent"
>ipatch_unit_tenth_percent_to_percent</a>
(int tenth_percent);
int <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-percent-to-tenth-percent"
>ipatch_unit_percent_to_tenth_percent</a>
(double percent);
</pre>
</div>
<div class="refsect1" title="Description">
<a name="libinstpatch-IpatchUnit-SF2.description"></a><h2>Description</h2>
<p>
</p>
</div>
<div class="refsect1" title="Details">
<a name="libinstpatch-IpatchUnit-SF2.details"></a><h2>Details</h2>
<div class="refsect2" title="ipatch_unit_sf2_abs_pitch_to_dls_abs_pitch ()">
<a name="ipatch-unit-sf2-abs-pitch-to-dls-abs-pitch"></a><h3>ipatch_unit_sf2_abs_pitch_to_dls_abs_pitch ()</h3>
<pre class="programlisting">int ipatch_unit_sf2_abs_pitch_to_dls_abs_pitch
(int sf2_abs_pitch);</pre>
<p>
Converts a value from SF2 absolute pitch to DLS absolute pitch.
</p>
<p>
sf2_abs_pitch = 1200 * log2(f/8.176)
f = 8.176 * 2^(sf2_abs_pitch/1200)
</p>
<p>
dls_abs_pitch = (1200 * log2(f/440) + 6900) * 65536
f = 440 * 2^((dls_abs_pitch / 65536 - 6900) / 1200)</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sf2_abs_pitch</code></em> :</span></p></td>
<td> Value in SF2 absolute pitch
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS absolute pitch
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_abs_pitch_to_sf2_abs_pitch ()">
<a name="ipatch-unit-dls-abs-pitch-to-sf2-abs-pitch"></a><h3>ipatch_unit_dls_abs_pitch_to_sf2_abs_pitch ()</h3>
<pre class="programlisting">int ipatch_unit_dls_abs_pitch_to_sf2_abs_pitch
(int dls_abs_pitch);</pre>
<p>
Converts a value from DLS absolute pitch to SF2 absolute pitch.
See <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-abs-pitch-to-dls-abs-pitch"
><code class="function">ipatch_unit_sf2_abs_pitch_to_dls_abs_pitch()</code></a></p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_abs_pitch</code></em> :</span></p></td>
<td> Value in DLS absolute pitch
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to SF2 absolute pitch
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_sf2_abs_pitch_to_hertz ()">
<a name="ipatch-unit-sf2-abs-pitch-to-hertz"></a><h3>ipatch_unit_sf2_abs_pitch_to_hertz ()</h3>
<pre class="programlisting">double ipatch_unit_sf2_abs_pitch_to_hertz (int sf2_abs_pitch);</pre>
<p>
Convert SoundFont absolute pitch to frequency in Hertz.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sf2_abs_pitch</code></em> :</span></p></td>
<td> Value in SoundFont absolute pitch
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value in Hertz (cycles per second)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_hertz_to_sf2_abs_pitch ()">
<a name="ipatch-unit-hertz-to-sf2-abs-pitch"></a><h3>ipatch_unit_hertz_to_sf2_abs_pitch ()</h3>
<pre class="programlisting">int ipatch_unit_hertz_to_sf2_abs_pitch (double hz);</pre>
<p>
Convert frequency in Hertz to SoundFont absolute pitch.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hz</code></em> :</span></p></td>
<td> Hertz (cycles per second) value
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Converted value in SoundFont absolute pitch.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_sf2_ofs_pitch_to_multiplier ()">
<a name="ipatch-unit-sf2-ofs-pitch-to-multiplier"></a><h3>ipatch_unit_sf2_ofs_pitch_to_multiplier ()</h3>
<pre class="programlisting">double ipatch_unit_sf2_ofs_pitch_to_multiplier
(int sf2_ofs_pitch);</pre>
<p>
Convert SoundFont offset pitch (cents) to multiplier factor.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sf2_ofs_pitch</code></em> :</span></p></td>
<td> Value in SoundFont offset pitch
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Multiplier factor
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_multiplier_to_sf2_ofs_pitch ()">
<a name="ipatch-unit-multiplier-to-sf2-ofs-pitch"></a><h3>ipatch_unit_multiplier_to_sf2_ofs_pitch ()</h3>
<pre class="programlisting">int ipatch_unit_multiplier_to_sf2_ofs_pitch
(double multiplier);</pre>
<p>
Convert multiplier factor to SoundFont offset pitch (cents).</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>multiplier</code></em> :</span></p></td>
<td> Multiplier factor
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Converted value in SoundFont offset pitch (cents).
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_sf2_abs_time_to_dls_abs_time ()">
<a name="ipatch-unit-sf2-abs-time-to-dls-abs-time"></a><h3>ipatch_unit_sf2_abs_time_to_dls_abs_time ()</h3>
<pre class="programlisting">int ipatch_unit_sf2_abs_time_to_dls_abs_time
(int sf2_abs_time);</pre>
<p>
Convert a value from SF2 absolute time to DLS absolute time.
</p>
<p>
sf2_abs_time = 1200 * log2 (seconds)
seconds = 2^(sf2_abs_time / 1200)
</p>
<p>
dls_abs_time = 1200 * log2 (seconds) * 65536
seconds = 2^(dls_abs_time / (1200 * 65536))</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sf2_abs_time</code></em> :</span></p></td>
<td> Value in SF2 absolute time (timecents)
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS absolute time.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_abs_time_to_sf2_abs_time ()">
<a name="ipatch-unit-dls-abs-time-to-sf2-abs-time"></a><h3>ipatch_unit_dls_abs_time_to_sf2_abs_time ()</h3>
<pre class="programlisting">int ipatch_unit_dls_abs_time_to_sf2_abs_time
(int dls_abs_time);</pre>
<p>
Convert a value from DLS absolute time to SF2 absolute time.
See <a
href="../libinstpatch/libinstpatch-IpatchUnit-SF2.html#ipatch-unit-sf2-abs-time-to-dls-abs-time"
><code class="function">ipatch_unit_sf2_abs_time_to_dls_abs_time()</code></a></p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_abs_time</code></em> :</span></p></td>
<td> Value in DLS absolute time
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to SF2 absolute time
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_sf2_abs_time_to_seconds ()">
<a name="ipatch-unit-sf2-abs-time-to-seconds"></a><h3>ipatch_unit_sf2_abs_time_to_seconds ()</h3>
<pre class="programlisting">double ipatch_unit_sf2_abs_time_to_seconds (int sf2_abs_time);</pre>
<p>
Convert a value from SoundFont absolute time (timecents) to seconds.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sf2_abs_time</code></em> :</span></p></td>
<td> Value in SoundFont absolute time
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value in seconds
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_seconds_to_sf2_abs_time ()">
<a name="ipatch-unit-seconds-to-sf2-abs-time"></a><h3>ipatch_unit_seconds_to_sf2_abs_time ()</h3>
<pre class="programlisting">int ipatch_unit_seconds_to_sf2_abs_time (double sec);</pre>
<p>
Convert value from seconds to SoundFont absolute time (timecents).</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sec</code></em> :</span></p></td>
<td> Value in seconds
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value in SoundFont absolute time
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_sf2_ofs_time_to_multiplier ()">
<a name="ipatch-unit-sf2-ofs-time-to-multiplier"></a><h3>ipatch_unit_sf2_ofs_time_to_multiplier ()</h3>
<pre class="programlisting">double ipatch_unit_sf2_ofs_time_to_multiplier
(int sf2_ofs_time);</pre>
<p>
Convert a value from SoundFont offset time (timecents) to a multiplier.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>sf2_ofs_time</code></em> :</span></p></td>
<td> Value in SoundFont offset time (timecents)
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Multiplier factor
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_multiplier_to_sf2_ofs_time ()">
<a name="ipatch-unit-multiplier-to-sf2-ofs-time"></a><h3>ipatch_unit_multiplier_to_sf2_ofs_time ()</h3>
<pre class="programlisting">int ipatch_unit_multiplier_to_sf2_ofs_time
(double multiplier);</pre>
<p>
Convert value from a multiplier to SoundFont offset time (timecents).</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>multiplier</code></em> :</span></p></td>
<td> Multiplier factor
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value in SoundFont offset time (timecents)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_centibels_to_dls_gain ()">
<a name="ipatch-unit-centibels-to-dls-gain"></a><h3>ipatch_unit_centibels_to_dls_gain ()</h3>
<pre class="programlisting">int ipatch_unit_centibels_to_dls_gain (int centibel);</pre>
<p>
Convert a value from centibels to DLS gain (1/655360th of a dB).
</p>
<p>
V = target amplitude, v = original amplitude
centibel = 200 * log10 (v / V)
dls_gain = 200 * 65536 * log10 (V / v)</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>centibel</code></em> :</span></p></td>
<td> Value in centibels (10th of a Decibel)
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to DLS gain
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_dls_gain_to_centibels ()">
<a name="ipatch-unit-dls-gain-to-centibels"></a><h3>ipatch_unit_dls_gain_to_centibels ()</h3>
<pre class="programlisting">int ipatch_unit_dls_gain_to_centibels (int dls_gain);</pre>
<p>
Convert a value from DLS gain to centibels.</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dls_gain</code></em> :</span></p></td>
<td> Value in DLS gain (1/655360th of a dB)
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value converted to centibels.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_centibels_to_decibels ()">
<a name="ipatch-unit-centibels-to-decibels"></a><h3>ipatch_unit_centibels_to_decibels ()</h3>
<pre class="programlisting">double ipatch_unit_centibels_to_decibels (int cb);</pre>
<p>
Convert a value from Centibels to Decibels.</p>
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<td><p><span class="term"><em class="parameter"><code>cb</code></em> :</span></p></td>
<td> Value in Centibels (10th of a Decibel)
</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value in Decibels
</td>
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<div class="refsect2" title="ipatch_unit_decibels_to_centibels ()">
<a name="ipatch-unit-decibels-to-centibels"></a><h3>ipatch_unit_decibels_to_centibels ()</h3>
<pre class="programlisting">int ipatch_unit_decibels_to_centibels (double db);</pre>
<p>
Convert Decibels to Centibels (10ths of a dB)</p>
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<td><p><span class="term"><em class="parameter"><code>db</code></em> :</span></p></td>
<td> Value in Decibels
</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Converted value in Centibels (10ths of a Decibel)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_tenth_percent_to_percent ()">
<a name="ipatch-unit-tenth-percent-to-percent"></a><h3>ipatch_unit_tenth_percent_to_percent ()</h3>
<pre class="programlisting">double ipatch_unit_tenth_percent_to_percent
(int tenth_percent);</pre>
<p>
Convert a value from 10ths of a Percent to Percent.</p>
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<td><p><span class="term"><em class="parameter"><code>tenth_percent</code></em> :</span></p></td>
<td> Value in 10ths of a Percent (Percent * 10)
</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Value in Percent
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" title="ipatch_unit_percent_to_tenth_percent ()">
<a name="ipatch-unit-percent-to-tenth-percent"></a><h3>ipatch_unit_percent_to_tenth_percent ()</h3>
<pre class="programlisting">int ipatch_unit_percent_to_tenth_percent
(double percent);</pre>
<p>
Convert Percent to 10ths of a Percent (Percent * 10)</p>
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<td><p><span class="term"><em class="parameter"><code>percent</code></em> :</span></p></td>
<td> Value in Percent
</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> Converted value in 10ths of a Percent
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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