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<div id="projectname">Arduino STK
 <span id="projectnumber">4.6.2</span>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef STK_BLITSAW_H</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define STK_BLITSAW_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 "Generator.h"</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include <cmath></span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include <limits></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="keyword">namespace </span><a class="code" href="namespacestk.html">stk</a> {</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  </div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/***************************************************/</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/***************************************************/</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html"> 31</a></span> <span class="keyword">class </span><a class="code" href="classstk_1_1BlitSaw.html">BlitSaw</a>: <span class="keyword">public</span> <a class="code" href="classstk_1_1Generator.html">Generator</a></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> {</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keyword">public</span>:</div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html#a8a245ef05cc58c521edaded5c6cdd5ee"> 35</a></span>  <a class="code" href="classstk_1_1BlitSaw.html#a8a245ef05cc58c521edaded5c6cdd5ee">BlitSaw</a>( StkFloat frequency = 220.0 );</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_1BlitSaw.html#a24cd2cc9852ce73252a99f7eff63879b"> 38</a></span>  <a class="code" href="classstk_1_1BlitSaw.html#a24cd2cc9852ce73252a99f7eff63879b">~BlitSaw</a>();</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html#a3010cf9a0905368b857df2d332968036"> 41</a></span>  <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlitSaw.html#a3010cf9a0905368b857df2d332968036">reset</a>();</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html#afa6f1103a61221eebf5f49f3a7df4145"> 44</a></span>  <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlitSaw.html#afa6f1103a61221eebf5f49f3a7df4145">setFrequency</a>( StkFloat frequency );</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
<div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html#a8abd2b9a5b8d26926a383c1e56605545"> 59</a></span>  <span class="keywordtype">void</span> <a class="code" href="classstk_1_1BlitSaw.html#a8abd2b9a5b8d26926a383c1e56605545">setHarmonics</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> nHarmonics = 0 );</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
<div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html#ad400ae700f2bb01dfcb7d536368e298a"> 62</a></span>  StkFloat <a class="code" href="classstk_1_1BlitSaw.html#ad400ae700f2bb01dfcb7d536368e298a">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="l00063"></a><span class="lineno"> 63</span>  </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  StkFloat <a class="code" href="classstk_1_1BlitSaw.html#a03536a1f1823ea41649b4a62ba98007c">tick</a>( <span class="keywordtype">void</span> );</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& <a class="code" href="classstk_1_1BlitSaw.html#a03536a1f1823ea41649b4a62ba98007c">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="l00076"></a><span class="lineno"> 76</span>  </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="keywordtype">void</span> updateHarmonics( <span class="keywordtype">void</span> );</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  </div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> nHarmonics_;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  StkFloat rate_;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  StkFloat phase_;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  StkFloat p_;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  StkFloat C2_;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  StkFloat a_;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  StkFloat state_;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> };</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  </div>
<div class="line"><a name="l00092"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html#a03536a1f1823ea41649b4a62ba98007c"> 92</a></span> <span class="keyword">inline</span> StkFloat <a class="code" href="classstk_1_1BlitSaw.html#a03536a1f1823ea41649b4a62ba98007c">BlitSaw :: tick</a>( <span class="keywordtype">void</span> )</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// The code below implements the BLIT algorithm of Stilson and</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// Smith, followed by a summation and filtering operation to produce</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// a sawtooth waveform. After experimenting with various approaches</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="comment">// to calculate the average value of the BLIT over one period, I</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// found that an estimate of C2_ = 1.0 / period (in samples) worked</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// most consistently. A "leaky integrator" is then applied to the</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// difference of the BLIT output and C2_. (GPS - 1 October 2005)</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  </div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">// A fully optimized version of this code would replace the two sin </span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// calls with a pair of fast sin oscillators, for which stable fast </span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// two-multiply algorithms are well known. In the spirit of STK,</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// which favors clarity over performance, the optimization has </span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// not been made here.</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="comment">// Avoid a divide by zero, or use of a denormalized divisor </span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// at the sinc peak, which has a limiting value of m_ / p_.</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  StkFloat tmp, denominator = sin( phase_ );</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">if</span> ( fabs(denominator) <= std::numeric_limits<StkFloat>::epsilon() )</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  tmp = a_;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  tmp = sin( m_ * phase_ );</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  tmp /= p_ * denominator;</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>  </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  tmp += state_ - C2_;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  state_ = tmp * 0.995;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  phase_ += rate_;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> ( phase_ >= STK_PI ) phase_ -= STK_PI;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  </div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  lastFrame_[0] = tmp;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">return</span> lastFrame_[0];</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="classstk_1_1BlitSaw.html#ab53f6ba99ef5c4f8982f6c0f07bf2e1d"> 128</a></span> <span class="keyword">inline</span> <a class="code" href="classstk_1_1StkFrames.html">StkFrames</a>& <a class="code" href="classstk_1_1BlitSaw.html#a03536a1f1823ea41649b4a62ba98007c">BlitSaw :: 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="l00129"></a><span class="lineno"> 129</span> {</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="preprocessor">#if defined(_STK_DEBUG_)</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</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="l00132"></a><span class="lineno"> 132</span>  oStream_ << <span class="stringliteral">"BlitSaw::tick(): channel and StkFrames arguments are incompatible!"</span>;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff">handleError</a>( StkError::FUNCTION_ARGUMENT );</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  StkFloat *samples = &frames[channel];</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</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="l00140"></a><span class="lineno"> 140</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="l00141"></a><span class="lineno"> 141</span>  *samples = <a class="code" href="classstk_1_1BlitSaw.html#a03536a1f1823ea41649b4a62ba98007c">BlitSaw::tick</a>();</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">return</span> frames;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> }</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  </div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> } <span class="comment">// stk namespace</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  </div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="preprocessor">#endif</span></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html"><div class="ttname"><a href="classstk_1_1BlitSaw.html">stk::BlitSaw</a></div><div class="ttdoc">STK band-limited sawtooth wave class.</div><div class="ttdef"><b>Definition:</b> BlitSaw.h:32</div></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html_a03536a1f1823ea41649b4a62ba98007c"><div class="ttname"><a href="classstk_1_1BlitSaw.html#a03536a1f1823ea41649b4a62ba98007c">stk::BlitSaw::tick</a></div><div class="ttdeci">StkFloat tick(void)</div><div class="ttdoc">Compute and return one output sample.</div><div class="ttdef"><b>Definition:</b> BlitSaw.h:92</div></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html_a24cd2cc9852ce73252a99f7eff63879b"><div class="ttname"><a href="classstk_1_1BlitSaw.html#a24cd2cc9852ce73252a99f7eff63879b">stk::BlitSaw::~BlitSaw</a></div><div class="ttdeci">~BlitSaw()</div><div class="ttdoc">Class destructor.</div></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html_a3010cf9a0905368b857df2d332968036"><div class="ttname"><a href="classstk_1_1BlitSaw.html#a3010cf9a0905368b857df2d332968036">stk::BlitSaw::reset</a></div><div class="ttdeci">void reset()</div><div class="ttdoc">Resets the oscillator state and phase to 0.</div></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html_a8a245ef05cc58c521edaded5c6cdd5ee"><div class="ttname"><a href="classstk_1_1BlitSaw.html#a8a245ef05cc58c521edaded5c6cdd5ee">stk::BlitSaw::BlitSaw</a></div><div class="ttdeci">BlitSaw(StkFloat frequency=220.0)</div><div class="ttdoc">Class constructor.</div></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html_a8abd2b9a5b8d26926a383c1e56605545"><div class="ttname"><a href="classstk_1_1BlitSaw.html#a8abd2b9a5b8d26926a383c1e56605545">stk::BlitSaw::setHarmonics</a></div><div class="ttdeci">void setHarmonics(unsigned int nHarmonics=0)</div><div class="ttdoc">Set the number of harmonics generated in the signal.</div></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html_ad400ae700f2bb01dfcb7d536368e298a"><div class="ttname"><a href="classstk_1_1BlitSaw.html#ad400ae700f2bb01dfcb7d536368e298a">stk::BlitSaw::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> BlitSaw.h:62</div></div>
<div class="ttc" id="aclassstk_1_1BlitSaw_html_afa6f1103a61221eebf5f49f3a7df4145"><div class="ttname"><a href="classstk_1_1BlitSaw.html#afa6f1103a61221eebf5f49f3a7df4145">stk::BlitSaw::setFrequency</a></div><div class="ttdeci">void setFrequency(StkFloat frequency)</div><div class="ttdoc">Set the sawtooth oscillator rate in terms of a frequency in Hz.</div></div>
<div class="ttc" id="aclassstk_1_1Generator_html"><div class="ttname"><a href="classstk_1_1Generator.html">stk::Generator</a></div><div class="ttdoc">STK abstract unit generator parent class.</div><div class="ttdef"><b>Definition:</b> Generator.h:21</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="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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