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<div class="refentry" title="hsboscil">
<a id="hsboscil"></a>
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<a id="Indexhsboscil" class="indexterm"></a>
<div class="refnamediv">
<h2>
<span class="refentrytitle">hsboscil</span>
</h2>
<p>hsboscil —
An oscillator which takes tonality and brightness as arguments.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp26172520"></a>
<h2>Description</h2>
<p>
An oscillator which takes tonality and brightness as arguments, relative to a base frequency.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp26173344"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>hsboscil</strong></span> kamp, ktone, kbrite, ibasfreq, iwfn, ioctfn \
[, ioctcnt] [, iphs]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp26167080"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ibasfreq</em></span> -- base frequency to which tonality and brighness are relative
</p>
<p>
<span class="emphasis"><em>iwfn</em></span> -- function table of the waveform, usually a sine
</p>
<p>
<span class="emphasis"><em>ioctfn</em></span> -- function table used for weighting the octaves, usually something like:
</p>
<div class="literallayout">
<p><span class="stamnt">f</span>1 0 1024 -19 1 0.5 270 0.5</p>
</div>
<p>
</p>
<p>
<span class="emphasis"><em>ioctcnt</em></span> (optional) -- number of octaves used for brightness blending. Must be in the range 2 to 10. Default is 3.
</p>
<p>
<span class="emphasis"><em>iphs</em></span> (optional, default=0) -- initial phase of the oscillator. If <span class="emphasis"><em>iphs</em></span> = -1, initialization is skipped.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp26225928"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude of note
</p>
<p>
<span class="emphasis"><em>ktone</em></span> -- cyclic tonality parameter relative to <span class="emphasis"><em>ibasfreq</em></span> in logarithmic octave, range 0 to 1, values > 1 can be used, and are internally reduced to <span class="emphasis"><em>frac</em></span>(<span class="emphasis"><em>ktone</em></span>).
</p>
<p>
<span class="emphasis"><em>kbrite</em></span> -- brightness parameter relative to <span class="emphasis"><em>ibasfreq</em></span>, achieved by weighting <span class="emphasis"><em>ioctcnt</em></span> octaves. It is scaled in such a way, that a value of 0 corresponds to the orignal value of <span class="emphasis"><em>ibasfreq</em></span>, 1 corresponds to one octave above <span class="emphasis"><em>ibasfreq</em></span>, -2 corresponds to two octaves below <span class="emphasis"><em>ibasfreq</em></span>, etc. <span class="emphasis"><em>kbrite</em></span> may be fractional.
</p>
<p>
<span class="emphasis"><em>hsboscil</em></span> takes tonality and brightness as arguments, relative to a base frequency (<span class="emphasis"><em>ibasfreq</em></span>). Tonality is a cyclic parameter in the logarithmic octave, brightness is realized by mixing multiple weighted octaves. It is useful when tone space is understood in a concept of polar coordinates.
</p>
<p>
Making <span class="emphasis"><em>ktone</em></span> a line, and <span class="emphasis"><em>kbrite</em></span> a constant, produces Risset's glissando.
</p>
<p>
Oscillator table <span class="emphasis"><em>iwfn</em></span> is always read interpolated. Performance time requires about <span class="emphasis"><em>ioctcnt</em></span> * <span class="emphasis"><em>oscili</em></span>.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp26232896"></a>
<h2>Examples</h2>
<p>
Here is an example of the hsboscil opcode. It uses the file <a class="ulink" href="examples/hsboscil.csd" target="_top"><em class="citetitle">hsboscil.csd</em></a>.
</p>
<div class="example">
<a id="idp26233888"></a>
<p class="title">
<strong>Example 345. Example of the hsboscil 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o hsboscil.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="comment">; synth waveform</span>
giwave <span class="ohdr">ftgen</span> 1, 0, 1024, 10, 1, 1, 1, 1
<span class="comment">; blending window</span>
giblend <span class="ohdr">ftgen</span> 2, 0, 1024, <span class="op">-</span>19, 1, 0.5, 270, 0.5
<span class="oblock">instr</span> 1 <span class="comment">; produces Risset's glissando.</span>
kamp <span class="op">=</span> .4
kbrite <span class="op">=</span> 0.3
ibasfreq <span class="op">=</span> 200
ioctcnt <span class="op">=</span> 5
<span class="comment">; Change ktone linearly from 0 to 1, </span>
<span class="comment">; over the period defined by p3.</span>
ktone <span class="opc">line</span> 0, p3, 1
asig <span class="opc">hsboscil</span> kamp, ktone, kbrite, ibasfreq, giwave, giblend, ioctcnt
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
<p>
Here is an example of the hsboscil opcode in a MIDI instrument. It uses the file <a class="ulink" href="examples/hsboscil_midi.csd" target="_top"><em class="citetitle">hsboscil_midi.csd</em></a>.
</p>
<div class="example">
<a id="idp26236776"></a>
<p class="title">
<strong>Example 346. Example of the hsboscil opcode in a MIDI instrument.</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 </span>
-odac -M0 <span class="comment">;;;realtime audio out and realtime MIDI in</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; -o hsboscil_midi.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="comment">; synth waveform</span>
giwave <span class="ohdr">ftgen</span> 1, 0, 1024, 10, 1, 1, 1, 1
<span class="comment">; blending window</span>
giblend <span class="ohdr">ftgen</span> 2, 0, 1024, <span class="op">-</span>19, 1, 0.5, 270, 0.5
<span class="oblock">instr</span> 1
ibase <span class="op">=</span> <span class="opc">cpsoct</span>(6)
ioctcnt <span class="op">=</span> 5
<span class="comment">; all octaves sound alike.</span>
itona <span class="opc">octmidi</span>
<span class="comment">; velocity is mapped to brightness</span>
ibrite <span class="opc">ampmidi</span> 4
<span class="comment">; Map an exponential envelope for the amplitude.</span>
kenv <span class="opc">expon</span> .8, 1, .01
asig <span class="opc">hsboscil</span> kenv, itona, ibrite, ibase, giwave, giblend, ioctcnt
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 30 <span class="comment">; play for 30 seconds</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp26239096"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Peter Neubäcker</td>
</tr>
<tr>
<td>Munich, Germany</td>
</tr>
<tr>
<td>August, 1999</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.58</p>
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