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<div class="refentry" title="adsynt2">
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<h2>
<span class="refentrytitle">adsynt2</span>
</h2>
<p>adsynt2 —
Performs additive synthesis with an arbitrary number of partials -not necessarily harmonic- with interpolation.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp13362632"></a>
<h2>Description</h2>
<p>
Performs additive synthesis with an arbitrary number of partials, not necessarily harmonic. (see <a class="link" href="adsynt.html" title="adsynt"><em class="citetitle">adsynt</em></a> for detailed manual)
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp13373136"></a>
<h2>Syntax</h2>
<pre class="synopsis">ar <span class="command"><strong>adsynt2</strong></span> kamp, kcps, iwfn, ifreqfn, iampfn, icnt [, iphs]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp13374272"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iwfn</em></span> -- table containing a waveform, usually a sine. Table values are not interpolated for performance reasons, so larger tables provide better quality.
</p>
<p>
<span class="emphasis"><em>ifreqfn</em></span> -- table containing frequency values for each partial. <span class="emphasis"><em>ifreqfn</em></span> may contain beginning frequency values for each partial, but is usually used for generating parameters at runtime with <span class="emphasis"><em>tablew</em></span>. Frequencies must be relative to <span class="emphasis"><em>kcps</em></span>. Size must be at least <span class="emphasis"><em>icnt</em></span>.
</p>
<p>
<span class="emphasis"><em>iampfn</em></span> -- table containing amplitude values for each partial. <span class="emphasis"><em>iampfn</em></span> may contain beginning amplitude values for each partial, but is usually used for generating parameters at runtime with <span class="emphasis"><em>tablew</em></span>. Amplitudes must be relative to <span class="emphasis"><em>kamp</em></span>. Size must be at least <span class="emphasis"><em>icnt</em></span>.
</p>
<p>
<span class="emphasis"><em>icnt</em></span> -- number of partials to be generated
</p>
<p>
<span class="emphasis"><em>iphs</em></span> -- initial phase of each oscillator, if <span class="emphasis"><em>iphs</em></span> = -1, initialization is skipped. If <span class="emphasis"><em>iphs</em></span> > 1, all phases will be initialized with a random value.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp13417696"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamp</em></span> -- amplitude of note
</p>
<p>
<span class="emphasis"><em>kcps</em></span> -- base frequency of note. Partial frequencies will be relative to <span class="emphasis"><em>kcps</em></span>.
</p>
<p>
Frequency and amplitude of each partial is given in the two tables provided. The purpose of this opcode is to have an instrument generate synthesis parameters at k-rate and write them to global parameter tables with the <span class="emphasis"><em>tablew</em></span> opcode.
</p>
<p>
<span class="emphasis"><em>adsynt2</em></span> is identical to <span class="emphasis"><em>adsynt</em></span> (by Peter Neubäcker), except it provides linear interpolation for amplitude envelopes of each partial. It is a bit slower than <span class="emphasis"><em>adsynt</em></span>, but interpolation higly improves sound quality in fast amplitude envelope transients when <span class="emphasis"><em>kr</em></span> < <span class="emphasis"><em>sr</em></span> (i.e. when <span class="emphasis"><em>ksmps</em></span> > 1). No interpolation is provided for pitch envelopes, since in this case sound quality degradation is not so evident even with high values of <span class="emphasis"><em>ksmps</em></span>. It is not recommended when <span class="emphasis"><em>kr</em></span> = <span class="emphasis"><em>sr</em></span>, in this case <span class="emphasis"><em>adsynt</em></span> is better (since it is faster).
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp13423000"></a>
<h2>Examples</h2>
<p>
Here is an example of the adsynt2 opcode. It uses the file <a class="ulink" href="examples/adsynt2.csd" target="_top"><em class="citetitle">adsynt2.csd</em></a>. These two instruments perform additive synthesis. The output of each sounds like a Tibetan bowl. The first one is static, as parameters are only generated at init-time. In the second one, parameters are continuously changed.
</p>
<div class="example">
<a id="idp13424200"></a>
<p class="title">
<strong>Example 42. Example of the adsynt2 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">;;;RT audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o adsynt2.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">; Generate a sinewave table.</span>
giwave <span class="ohdr">ftgen</span> 1, 0, 1024, 10, 1
<span class="comment">; Generate two empty tables for adsynt2.</span>
gifrqs <span class="ohdr">ftgen</span> 2, 0, 32, 7, 0, 32, 0
<span class="comment">; A table for freqency and amp parameters.</span>
giamps <span class="ohdr">ftgen</span> 3, 0, 32, 7, 0, 32, 0
<span class="comment">; Generates parameters at init time</span>
<span class="oblock">instr</span> 1
<span class="comment">; Generate 10 voices.</span>
icnt <span class="op">=</span> 10
<span class="comment">; Init loop index.</span>
index <span class="op">=</span> 0
<span class="comment">; Loop only executed at init time.</span>
<span class="olabel">loop</span><span class="op">:</span>
<span class="comment">; Define non-harmonic partials.</span>
ifreq <span class="opc">pow</span> index <span class="op">+</span> 1, 1.5
<span class="comment">; Define amplitudes.</span>
iamp <span class="op">=</span> 1 <span class="op">/</span> (index<span class="op">+</span>1)
<span class="comment">; Write to tables.</span>
<span class="opc">tableiw</span> ifreq, index, gifrqs
<span class="comment">; Used by adsynt2.</span>
<span class="opc">tableiw</span> iamp, index, giamps
index <span class="op">=</span> index <span class="op">+</span> 1
<span class="comment">; Do loop/</span>
<span class="octrl">if</span> (index <span class="op"><</span> icnt) <span class="octrl">igoto</span> <span class="olabel">loop</span>
asig <span class="opc">adsynt2</span> 0.4, 150, giwave, gifrqs, giamps, icnt
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="comment">; Generates parameters every k-cycle.</span>
<span class="oblock">instr</span> 2
<span class="comment">; Generate 10 voices.</span>
icnt <span class="op">=</span> 10
<span class="comment">; Reset loop index.</span>
kindex <span class="op">=</span> 0
<span class="comment">; Loop executed every k-cycle.</span>
<span class="olabel">loop</span><span class="op">:</span>
<span class="comment">; Generate lfo for frequencies.</span>
kspeed <span class="opc">pow</span> kindex <span class="op">+</span> 1, 1.6
<span class="comment">; Individual phase for each voice.</span>
kphas <span class="opc">phasorbnk</span> kspeed <span class="op">*</span> 0.7, kindex, icnt
klfo <span class="opc">table</span> kphas, giwave, 1
<span class="comment">; Arbitrary parameter twiddling...</span>
kdepth <span class="opc">pow</span> 1.4, kindex
kfreq <span class="opc">pow</span> kindex <span class="op">+</span> 1, 1.5
kfreq <span class="op">=</span> kfreq <span class="op">+</span> klfo<span class="op">*</span>0.006<span class="op">*</span>kdepth
<span class="comment">; Write freqs to table for adsynt2.</span>
<span class="opc">tablew</span> kfreq, kindex, gifrqs
<span class="comment">; Generate lfo for amplitudes.</span>
kspeed <span class="opc">pow</span> kindex <span class="op">+</span> 1, 0.8
<span class="comment">; Individual phase for each voice.</span>
kphas <span class="opc">phasorbnk</span> kspeed<span class="op">*</span>0.13, kindex, icnt, 2
klfo <span class="opc">table</span> kphas, giwave, 1
<span class="comment">; Arbitrary parameter twiddling...</span>
kamp <span class="opc">pow</span> 1 <span class="op">/</span> (kindex <span class="op">+</span> 1), 0.4
kamp <span class="op">=</span> kamp <span class="op">*</span> (0.3<span class="op">+</span>0.35<span class="op">*</span>(klfo<span class="op">+</span>1))
<span class="comment">; Write amps to table for adsynt2.</span>
<span class="opc">tablew</span> kamp, kindex, giamps
kindex <span class="op">=</span> kindex <span class="op">+</span> 1
<span class="comment">; Do loop.</span>
<span class="octrl">if</span> (kindex <span class="op"><</span> icnt) <span class="octrl">kgoto</span> <span class="olabel">loop</span>
asig <span class="opc">adsynt2</span> 0.25, 150, giwave, gifrqs, giamps, icnt
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for 2.5 seconds.</span>
<span class="stamnt">i</span> 1 0 2.5
<span class="comment">; Play Instrument #2 for 2.5 seconds.</span>
<span class="stamnt">i</span> 2 3 2.5
<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="idp13426480"></a>
<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
<p>New in Csound 5 (Previously available only on CsoundAV)</p>
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