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Echo_8h_source.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Arduino STK: Echo.h Source File</title>
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<div id="projectname">Arduino STK
 <span id="projectnumber">4.6.2</span>
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<div class="title">Echo.h</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef STK_ECHO_H</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define STK_ECHO_H</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>  </div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="preprocessor">#include "Effect.h"</span> </div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "Delay.h"</span> </div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="keyword">namespace </span><a class="code" href="namespacestk.html">stk</a> {</div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  </div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">/***************************************************/</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">/***************************************************/</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  </div>
<div class="line"><a name="l00019"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html"> 19</a></span> <span class="keyword">class </span><a class="code" href="classstk_1_1Echo.html">Echo</a> : <span class="keyword">public</span> <a class="code" href="classstk_1_1Effect.html">Effect</a></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> {</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  </div>
<div class="line"><a name="l00026"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#a5f3320986d5c9b02ad10663ff11b6505"> 26</a></span>  <a class="code" href="classstk_1_1Echo.html#a5f3320986d5c9b02ad10663ff11b6505">Echo</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> maximumDelay = (<span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>) <a class="code" href="classstk_1_1Stk.html#a5fbe37000a611ce56075ee7d8936472d">Stk::sampleRate</a>() );</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#a253e0f8e4c628b431fdfcb6d880548c2"> 29</a></span>  <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Echo.html#a253e0f8e4c628b431fdfcb6d880548c2">clear</a>();</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#a421a6f5f06f8e7df09edd179d397da7d"> 32</a></span>  <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Echo.html#a421a6f5f06f8e7df09edd179d397da7d">setMaximumDelay</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> delay );</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#ae58ea12a2864481cb7049c10810867ce"> 35</a></span>  <span class="keywordtype">void</span> <a class="code" href="classstk_1_1Echo.html#ae58ea12a2864481cb7049c10810867ce">setDelay</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> delay );</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#a39ee6a7b286a1f23d3171fc426b46cce"> 38</a></span>  StkFloat <a class="code" href="classstk_1_1Echo.html#a39ee6a7b286a1f23d3171fc426b46cce">lastOut</a>( <span class="keywordtype">void</span> )<span class="keyword"> const </span>{ <span class="keywordflow">return</span> lastFrame_[0]; };</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  StkFloat <a class="code" href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91">tick</a>( StkFloat input );</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& <a class="code" href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91">tick</a>( <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel = 0 );</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& <a class="code" href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91">tick</a>( <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& iFrames, <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a> &oFrames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iChannel = 0, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> oChannel = 0 );</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <a class="code" href="classstk_1_1Delay.html">Delay</a> delayLine_;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> length_;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> };</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  </div>
<div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91"> 72</a></span> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91">Echo :: tick</a>( StkFloat input )</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  lastFrame_[0] = effectMix_ * ( delayLine_.<a class="code" href="classstk_1_1Delay.html#aa1a929e0e324417b8a55cbf8770532e9">tick</a>( input ) - input ) + input;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">return</span> lastFrame_[0];</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#aefe863b7aa43d6a94c2a56bd31a30e7d"> 78</a></span> <span class="keyword">inline</span> <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& <a class="code" href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91">Echo :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& frames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> channel )</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> {</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor">#if defined(_STK_DEBUG_)</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span> ( channel >= frames.<a class="code" href="classstk_1_1StkFrames.html#a0340d9e76707282658e49509a568f60e">channels</a>() ) {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  oStream_ << <span class="stringliteral">"Echo::tick(): channel and StkFrames arguments are incompatible!"</span>;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff">handleError</a>( StkError::FUNCTION_ARGUMENT );</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  StkFloat *samples = &frames[channel];</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.<a class="code" href="classstk_1_1StkFrames.html#a0340d9e76707282658e49509a568f60e">channels</a>();</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<frames.<a class="code" href="classstk_1_1StkFrames.html#a0fc22e21feecdee966f0203722b9c168">frames</a>(); i++, samples += hop ) {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  *samples = effectMix_ * ( delayLine_.<a class="code" href="classstk_1_1Delay.html#aa1a929e0e324417b8a55cbf8770532e9">tick</a>( *samples ) - *samples ) + *samples;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  lastFrame_[0] = *(samples-hop);</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">return</span> frames;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> }</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div>
<div class="line"><a name="l00097"></a><span class="lineno"><a class="line" href="classstk_1_1Echo.html#a1778a7da06b222afbe9281c886f678d8"> 97</a></span> <span class="keyword">inline</span> <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& <a class="code" href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91">Echo :: tick</a>( <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& iFrames, <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& oFrames, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iChannel, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> oChannel )</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="preprocessor">#if defined(_STK_DEBUG_)</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span> ( iChannel >= iFrames.<a class="code" href="classstk_1_1StkFrames.html#a0340d9e76707282658e49509a568f60e">channels</a>() || oChannel >= oFrames.<a class="code" href="classstk_1_1StkFrames.html#a0340d9e76707282658e49509a568f60e">channels</a>() ) {</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  oStream_ << <span class="stringliteral">"Echo::tick(): channel and StkFrames arguments are incompatible!"</span>;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff">handleError</a>( StkError::FUNCTION_ARGUMENT );</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  }</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  StkFloat *iSamples = &iFrames[iChannel];</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  StkFloat *oSamples = &oFrames[oChannel];</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.<a class="code" href="classstk_1_1StkFrames.html#a0340d9e76707282658e49509a568f60e">channels</a>(), oHop = oFrames.<a class="code" href="classstk_1_1StkFrames.html#a0340d9e76707282658e49509a568f60e">channels</a>();</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<iFrames.<a class="code" href="classstk_1_1StkFrames.html#a0fc22e21feecdee966f0203722b9c168">frames</a>(); i++, iSamples += iHop, oSamples += oHop ) {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  *oSamples = effectMix_ * ( delayLine_.<a class="code" href="classstk_1_1Delay.html#aa1a929e0e324417b8a55cbf8770532e9">tick</a>( *iSamples ) - *iSamples ) + *iSamples;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  }</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  lastFrame_[0] = *(oSamples-oHop);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">return</span> iFrames;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> }</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> } <span class="comment">// stk namespace</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  </div>
<div class="ttc" id="aclassstk_1_1Delay_html"><div class="ttname"><a href="classstk_1_1Delay.html">stk::Delay</a></div><div class="ttdoc">STK non-interpolating delay line class.</div><div class="ttdef"><b>Definition:</b> Delay.h:25</div></div>
<div class="ttc" id="aclassstk_1_1Delay_html_aa1a929e0e324417b8a55cbf8770532e9"><div class="ttname"><a href="classstk_1_1Delay.html#aa1a929e0e324417b8a55cbf8770532e9">stk::Delay::tick</a></div><div class="ttdeci">StkFloat tick(StkFloat input)</div><div class="ttdoc">Input one sample to the filter and return one output.</div><div class="ttdef"><b>Definition:</b> Delay.h:124</div></div>
<div class="ttc" id="aclassstk_1_1Echo_html"><div class="ttname"><a href="classstk_1_1Echo.html">stk::Echo</a></div><div class="ttdoc">STK echo effect class.</div><div class="ttdef"><b>Definition:</b> Echo.h:20</div></div>
<div class="ttc" id="aclassstk_1_1Echo_html_a253e0f8e4c628b431fdfcb6d880548c2"><div class="ttname"><a href="classstk_1_1Echo.html#a253e0f8e4c628b431fdfcb6d880548c2">stk::Echo::clear</a></div><div class="ttdeci">void clear()</div><div class="ttdoc">Reset and clear all internal state.</div></div>
<div class="ttc" id="aclassstk_1_1Echo_html_a39ee6a7b286a1f23d3171fc426b46cce"><div class="ttname"><a href="classstk_1_1Echo.html#a39ee6a7b286a1f23d3171fc426b46cce">stk::Echo::lastOut</a></div><div class="ttdeci">StkFloat lastOut(void) const</div><div class="ttdoc">Return the last computed output value.</div><div class="ttdef"><b>Definition:</b> Echo.h:38</div></div>
<div class="ttc" id="aclassstk_1_1Echo_html_a421a6f5f06f8e7df09edd179d397da7d"><div class="ttname"><a href="classstk_1_1Echo.html#a421a6f5f06f8e7df09edd179d397da7d">stk::Echo::setMaximumDelay</a></div><div class="ttdeci">void setMaximumDelay(unsigned long delay)</div><div class="ttdoc">Set the maximum delay line length in samples.</div></div>
<div class="ttc" id="aclassstk_1_1Echo_html_a4cfb2c2dd350717cd8151749d3a32f91"><div class="ttname"><a href="classstk_1_1Echo.html#a4cfb2c2dd350717cd8151749d3a32f91">stk::Echo::tick</a></div><div class="ttdeci">StkFloat tick(StkFloat input)</div><div class="ttdoc">Input one sample to the effect and return one output.</div><div class="ttdef"><b>Definition:</b> Echo.h:72</div></div>
<div class="ttc" id="aclassstk_1_1Echo_html_a5f3320986d5c9b02ad10663ff11b6505"><div class="ttname"><a href="classstk_1_1Echo.html#a5f3320986d5c9b02ad10663ff11b6505">stk::Echo::Echo</a></div><div class="ttdeci">Echo(unsigned long maximumDelay=(unsigned long) Stk::sampleRate())</div><div class="ttdoc">Class constructor, taking the longest desired delay length (one second default value).</div></div>
<div class="ttc" id="aclassstk_1_1Echo_html_ae58ea12a2864481cb7049c10810867ce"><div class="ttname"><a href="classstk_1_1Echo.html#ae58ea12a2864481cb7049c10810867ce">stk::Echo::setDelay</a></div><div class="ttdeci">void setDelay(unsigned long delay)</div><div class="ttdoc">Set the delay line length in samples.</div></div>
<div class="ttc" id="aclassstk_1_1Effect_html"><div class="ttname"><a href="classstk_1_1Effect.html">stk::Effect</a></div><div class="ttdoc">STK abstract effects parent class.</div><div class="ttdef"><b>Definition:</b> Effect.h:22</div></div>
<div class="ttc" id="aclassstk_1_1StkFrames_html"><div class="ttname"><a href="classstk_1_1StkFrames.html">stk::StkFrames</a></div><div class="ttdoc">An STK class to handle vectorized audio data.</div><div class="ttdef"><b>Definition:</b> Stk.h:287</div></div>
<div class="ttc" id="aclassstk_1_1StkFrames_html_a0340d9e76707282658e49509a568f60e"><div class="ttname"><a href="classstk_1_1StkFrames.html#a0340d9e76707282658e49509a568f60e">stk::StkFrames::channels</a></div><div class="ttdeci">unsigned int channels(void) const</div><div class="ttdoc">Return the number of channels represented by the data.</div><div class="ttdef"><b>Definition:</b> Stk.h:415</div></div>
<div class="ttc" id="aclassstk_1_1StkFrames_html_a0fc22e21feecdee966f0203722b9c168"><div class="ttname"><a href="classstk_1_1StkFrames.html#a0fc22e21feecdee966f0203722b9c168">stk::StkFrames::frames</a></div><div class="ttdeci">unsigned int frames(void) const</div><div class="ttdoc">Return the number of sample frames represented by the data.</div><div class="ttdef"><b>Definition:</b> Stk.h:418</div></div>
<div class="ttc" id="aclassstk_1_1Stk_html_a48ac73a0d8ca28445ba1a054e1f061ff"><div class="ttname"><a href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff">stk::Stk::handleError</a></div><div class="ttdeci">static void handleError(const char *message, StkError::Type type)</div><div class="ttdoc">Static function for error reporting and handling using c-strings.</div></div>
<div class="ttc" id="aclassstk_1_1Stk_html_a5fbe37000a611ce56075ee7d8936472d"><div class="ttname"><a href="classstk_1_1Stk.html#a5fbe37000a611ce56075ee7d8936472d">stk::Stk::sampleRate</a></div><div class="ttdeci">static StkFloat sampleRate(void)</div><div class="ttdoc">Static method that returns the current STK sample rate.</div><div class="ttdef"><b>Definition:</b> Stk.h:156</div></div>
<div class="ttc" id="anamespacestk_html"><div class="ttname"><a href="namespacestk.html">stk</a></div><div class="ttdoc">The STK namespace.</div><div class="ttdef"><b>Definition:</b> ADSR.h:8</div></div>
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