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<div class="refentry" title="pitch">
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<a id="IndexPitch" class="indexterm"></a>
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<h2>
<span class="refentrytitle">pitch</span>
</h2>
<p>pitch —
Tracks the pitch of a signal.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp36330320"></a>
<h2>Description</h2>
<p>
Using the same techniques as <a class="link" href="spectrum.html" title="spectrum"><em class="citetitle">spectrum</em></a> and <a class="link" href="specptrk.html" title="specptrk"><em class="citetitle">specptrk</em></a>, pitch tracks the pitch of the signal in octave point decimal form, and amplitude in dB.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp36380672"></a>
<h2>Syntax</h2>
<pre class="synopsis">koct, kamp <span class="command"><strong>pitch</strong></span> asig, iupdte, ilo, ihi, idbthresh [, ifrqs] [, iconf] \
[, istrt] [, iocts] [, iq] [, inptls] [, irolloff] [, iskip]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp36382056"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iupdte</em></span> -- length of period, in seconds, that outputs are updated
</p>
<p>
<span class="emphasis"><em>ilo</em></span>, <span class="emphasis"><em>ihi</em></span> -- range in which pitch is detected, expressed in octave point decimal
</p>
<p>
<span class="emphasis"><em>idbthresh</em></span> -- amplitude, expressed in decibels, necessary for the pitch to be detected. Once started it continues until it is 6 dB down.
</p>
<p>
<span class="emphasis"><em>ifrqs</em></span> (optional) -- number of divisons of an octave. Default is 12 and is limited to 120.
</p>
<p>
<span class="emphasis"><em>iconf</em></span> (optional) -- the number of conformations needed for an octave jump. Default is 10.
</p>
<p>
<span class="emphasis"><em>istrt</em></span> (optional) -- starting pitch for tracker. Default value is (<span class="emphasis"><em>ilo</em></span> + <span class="emphasis"><em>ihi</em></span>)/2.
</p>
<p>
<span class="emphasis"><em>iocts</em></span> (optional) -- number of octave decimations in spectrum. Default is 6.
</p>
<p>
<span class="emphasis"><em>iq</em></span> (optional) -- Q of analysis filters. Default is 10.
</p>
<p>
<span class="emphasis"><em>inptls</em></span> (optional) -- number of harmonics, used in matching. Computation time increases with the number of harmonics. Default is 4.
</p>
<p>
<span class="emphasis"><em>irolloff</em></span> (optional) -- amplitude rolloff for the set of filters expressed as fraction per octave. Values must be positive. Default is 0.6.
</p>
<p>
<span class="emphasis"><em>iskip</em></span> (optional) -- if non-zero, skips initialization. Default is 0.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp36389664"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>koct</em></span> -- The pitch output, given in the octave point decimal format.
</p>
<p>
<span class="emphasis"><em>kamp</em></span> -- The amplitude output.
</p>
<p>
<span class="emphasis"><em>pitch</em></span> analyzes the input signal, <span class="emphasis"><em>asig</em></span>, to give a pitch/amplitude pair of outputs, for the strongest frequency in the signal. The value is updated every <span class="emphasis"><em>iupdte</em></span> seconds.
</p>
<p>
The number of partials and rolloff fraction can effect the pitch tracking, so some experimentation may be necessary. Suggested values are 4 or 5 harmonics, with rolloff 0.6, up to 10 or 12 harmonics with rolloff 0.75 for complex timbres, with a weak fundamental.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp36392912"></a>
<h2>Examples</h2>
<p>
Here is an example of the pitch opcode. It uses the file <a class="ulink" href="examples/pitch.csd" target="_top"><em class="citetitle">pitch.csd</em></a>.
</p>
<div class="example">
<a id="idp36393888"></a>
<p class="title">
<strong>Example 593. Example of the pitch 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 real audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o pitch.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="oblock">instr</span> 1 <span class="comment">;clean audio</span>
asig <span class="opc">soundin</span> p4
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">;use pitch</span>
iupdte <span class="op">=</span> 0.001 <span class="comment">;high definition</span>
ilo <span class="op">=</span> 6
ihi <span class="op">=</span> 10
idbthresh <span class="op">=</span> 10
ifrqs <span class="op">=</span> 12
iconf <span class="op">=</span> 10
istrt <span class="op">=</span> 8
asig <span class="opc">soundin</span> p4
koct, kamp <span class="opc">pitch</span> asig, iupdte, ilo, ihi, idbthresh, ifrqs, iconf, istrt
kamp <span class="op">=</span> kamp<span class="op">*</span>.00005 <span class="comment">;lower volume</span>
kcps <span class="op">=</span> <span class="opc">cpsoct</span>(koct)
asig <span class="opc">poscil</span> kamp, kcps, 1 <span class="comment">;re-synthesize with sawtooth</span>
<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">f</span>1 0 16384 10 1 0.5 0.3 0.25 0.2 0.167 0.14 0.125 .111 <span class="comment">;sawtooth</span>
<span class="stamnt">i</span> 1 0 3 "fox.wav"
<span class="stamnt">i</span> 2 3 3 "fox.wav"
<span class="stamnt">i</span> 1 6 3 "mary.wav"
<span class="stamnt">i</span> 2 9 3 "mary.wav"
<span class="stamnt">i</span> 1 12 3 "beats.wav"
<span class="stamnt">i</span> 2 15 3 "beats.wav"
<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="idp36396192"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath, Codemist Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>April 1999</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 3.54</p>
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