1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
|
<HTML>
<HEAD>
<TITLE>The Synthesis ToolKit in C++ (STK)</TITLE>
<LINK HREF="doxygen.css" REL="stylesheet" TYPE="text/css">
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<CENTER>
<img src="princeton.gif"> <img src="ccrma.gif"> <img src="mcgill.gif"><P>
<a class="qindex" href="index.html">Home</a> <a class="qindex" href="information.html">Information</a> <a class="qindex" href="classes.html">Classes</a> <a class="qindex" href="download.html">Download</a> <a class="qindex" href="usage.html">Usage</a> <a class="qindex" href="maillist.html">Mail List</a> <a class="qindex" href="system.html">Requirements</a> <a class="qindex" href="links.html">Links</a> <a class="qindex" href="faq.html">FAQ</a> <a class="qindex" href="tutorial.html">Tutorial</a></CENTER>
<HR>
<!-- Generated by Doxygen 1.6.2 -->
<div class="navpath"><a class="el" href="namespacestk.html">stk</a>::<a class="el" href="classstk_1_1BiQuad.html">BiQuad</a>
</div>
<div class="contents">
<h1>stk::BiQuad Class Reference</h1><!-- doxytag: class="stk::BiQuad" --><!-- doxytag: inherits="stk::Filter" -->
<p>STK biquad (two-pole, two-zero) filter class.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="BiQuad_8h_source.html">BiQuad.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for stk::BiQuad:</div>
<div class="dynsection">
<div class="center">
<img src="classstk_1_1BiQuad.png" usemap="#stk::BiQuad_map" alt=""/>
<map id="stk::BiQuad_map" name="stk::BiQuad_map">
<area href="classstk_1_1Filter.html" alt="stk::Filter" shape="rect" coords="0,56,75,80"/>
<area href="classstk_1_1Stk.html" alt="stk::Stk" shape="rect" coords="0,0,75,24"/>
</map>
</div>
</div>
<p><a href="classstk_1_1BiQuad-members.html">List of all members.</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a91aab9d1b4833e156edcf59cbe276e3f"></a><!-- doxytag: member="stk::BiQuad::BiQuad" ref="a91aab9d1b4833e156edcf59cbe276e3f" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a91aab9d1b4833e156edcf59cbe276e3f">BiQuad</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Default constructor creates a second-order pass-through filter. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad7e81be1c4e5c5ab69474f6df2610984"></a><!-- doxytag: member="stk::BiQuad::~BiQuad" ref="ad7e81be1c4e5c5ab69474f6df2610984" args="()" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#ad7e81be1c4e5c5ab69474f6df2610984">~BiQuad</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Class destructor. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aab468cd1aa79b95442b15bb04d8bb211"></a><!-- doxytag: member="stk::BiQuad::ignoreSampleRateChange" ref="aab468cd1aa79b95442b15bb04d8bb211" args="(bool ignore=true)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#aab468cd1aa79b95442b15bb04d8bb211">ignoreSampleRateChange</a> (bool ignore=true)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">A function to enable/disable the automatic updating of class data when the STK sample rate changes. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aeed58196cf798f664cddbb9a8564c7b5"></a><!-- doxytag: member="stk::BiQuad::setCoefficients" ref="aeed58196cf798f664cddbb9a8564c7b5" args="(StkFloat b0, StkFloat b1, StkFloat b2, StkFloat a1, StkFloat a2, bool clearState=false)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#aeed58196cf798f664cddbb9a8564c7b5">setCoefficients</a> (StkFloat b0, StkFloat b1, StkFloat b2, StkFloat a1, StkFloat a2, bool clearState=false)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set all filter coefficients. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a26ee25d08116b20f326001166f087853"></a><!-- doxytag: member="stk::BiQuad::setB0" ref="a26ee25d08116b20f326001166f087853" args="(StkFloat b0)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a26ee25d08116b20f326001166f087853">setB0</a> (StkFloat b0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[0] coefficient value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="add364ed410b3ed2a2b29b8a5fea127c8"></a><!-- doxytag: member="stk::BiQuad::setB1" ref="add364ed410b3ed2a2b29b8a5fea127c8" args="(StkFloat b1)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#add364ed410b3ed2a2b29b8a5fea127c8">setB1</a> (StkFloat b1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[1] coefficient value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a208a654dd3393ed0b2b86ad56d9cf3e1"></a><!-- doxytag: member="stk::BiQuad::setB2" ref="a208a654dd3393ed0b2b86ad56d9cf3e1" args="(StkFloat b2)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a208a654dd3393ed0b2b86ad56d9cf3e1">setB2</a> (StkFloat b2)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the b[2] coefficient value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1c9799e47163fe8a59fd85196c089cb3"></a><!-- doxytag: member="stk::BiQuad::setA1" ref="a1c9799e47163fe8a59fd85196c089cb3" args="(StkFloat a1)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a1c9799e47163fe8a59fd85196c089cb3">setA1</a> (StkFloat a1)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the a[1] coefficient value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae28afd560df11435ea54f128d23b9383"></a><!-- doxytag: member="stk::BiQuad::setA2" ref="ae28afd560df11435ea54f128d23b9383" args="(StkFloat a2)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#ae28afd560df11435ea54f128d23b9383">setA2</a> (StkFloat a2)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the a[2] coefficient value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a55aaa01fd4156f1fac1168f526e3d969">setResonance</a> (StkFloat frequency, StkFloat radius, bool normalize=false)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the filter coefficients for a resonance at <em>frequency</em> (in Hz). <a href="#a55aaa01fd4156f1fac1168f526e3d969"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#ae10a26fc319ba357bc92df4e528c2d8f">setNotch</a> (StkFloat frequency, StkFloat radius)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the filter coefficients for a notch at <em>frequency</em> (in Hz). <a href="#ae10a26fc319ba357bc92df4e528c2d8f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a28881f5876ce5bdcc846367cca9363f7">setEqualGainZeroes</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Sets the filter zeroes for equal resonance gain. <a href="#a28881f5876ce5bdcc846367cca9363f7"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a412f224363b1a222423ecf0cd7be9063"></a><!-- doxytag: member="stk::BiQuad::lastOut" ref="a412f224363b1a222423ecf0cd7be9063" args="(void) const " -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a412f224363b1a222423ecf0cd7be9063">lastOut</a> (void) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the last computed output value. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a648086962c3cddcaa09c46a002c3e635"></a><!-- doxytag: member="stk::BiQuad::tick" ref="a648086962c3cddcaa09c46a002c3e635" args="(StkFloat input)" -->
StkFloat </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#a648086962c3cddcaa09c46a002c3e635">tick</a> (StkFloat input)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Input one sample to the filter and return a reference to one output. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#af903e41217838470a5f267a20b905a12">tick</a> (<a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &frames, unsigned int channel=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Take a channel of the <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> object as inputs to the filter and replace with corresponding outputs. <a href="#af903e41217838470a5f267a20b905a12"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classstk_1_1BiQuad.html#ac9836f0e074ea9516727f27eb9b411aa">tick</a> (<a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &iFrames, <a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> &oFrames, unsigned int iChannel=0, unsigned int oChannel=0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Take a channel of the <code>iFrames</code> object as inputs to the filter and write outputs to the <code>oFrames</code> object. <a href="#ac9836f0e074ea9516727f27eb9b411aa"></a><br/></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>STK biquad (two-pole, two-zero) filter class. </p>
<p>This class implements a two-pole, two-zero digital filter. Methods are provided for creating a resonance or notch in the frequency response while maintaining a constant filter gain.</p>
<p>by Perry R. Cook and Gary P. Scavone, 1995-2012. </p>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a55aaa01fd4156f1fac1168f526e3d969"></a><!-- doxytag: member="stk::BiQuad::setResonance" ref="a55aaa01fd4156f1fac1168f526e3d969" args="(StkFloat frequency, StkFloat radius, bool normalize=false)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void stk::BiQuad::setResonance </td>
<td>(</td>
<td class="paramtype">StkFloat </td>
<td class="paramname"> <em>frequency</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">StkFloat </td>
<td class="paramname"> <em>radius</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"> <em>normalize</em> = <code>false</code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Sets the filter coefficients for a resonance at <em>frequency</em> (in Hz). </p>
<p>This method determines the filter coefficients corresponding to two complex-conjugate poles with the given <em>frequency</em> (in Hz) and <em>radius</em> from the z-plane origin. If <em>normalize</em> is true, the filter zeros are placed at z = 1, z = -1, and the coefficients are then normalized to produce a constant unity peak gain (independent of the filter <em>gain</em> parameter). The resulting filter frequency response has a resonance at the given <em>frequency</em>. The closer the poles are to the unit-circle (<em>radius</em> close to one), the narrower the resulting resonance width. An unstable filter will result for <em>radius</em> >= 1.0. The <em>frequency</em> value should be between zero and half the sample rate. </p>
</div>
</div>
<a class="anchor" id="ae10a26fc319ba357bc92df4e528c2d8f"></a><!-- doxytag: member="stk::BiQuad::setNotch" ref="ae10a26fc319ba357bc92df4e528c2d8f" args="(StkFloat frequency, StkFloat radius)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void stk::BiQuad::setNotch </td>
<td>(</td>
<td class="paramtype">StkFloat </td>
<td class="paramname"> <em>frequency</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">StkFloat </td>
<td class="paramname"> <em>radius</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Set the filter coefficients for a notch at <em>frequency</em> (in Hz). </p>
<p>This method determines the filter coefficients corresponding to two complex-conjugate zeros with the given <em>frequency</em> (in Hz) and <em>radius</em> from the z-plane origin. No filter normalization is attempted. The <em>frequency</em> value should be between zero and half the sample rate. The <em>radius</em> value should be positive. </p>
</div>
</div>
<a class="anchor" id="a28881f5876ce5bdcc846367cca9363f7"></a><!-- doxytag: member="stk::BiQuad::setEqualGainZeroes" ref="a28881f5876ce5bdcc846367cca9363f7" args="(void)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void stk::BiQuad::setEqualGainZeroes </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Sets the filter zeroes for equal resonance gain. </p>
<p>When using the filter as a resonator, zeroes places at z = 1, z = -1 will result in a constant gain at resonance of 1 / (1 - R), where R is the pole radius setting. </p>
</div>
</div>
<a class="anchor" id="af903e41217838470a5f267a20b905a12"></a><!-- doxytag: member="stk::BiQuad::tick" ref="af903e41217838470a5f267a20b905a12" args="(StkFrames &frames, unsigned int channel=0)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & stk::BiQuad::tick </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
<td class="paramname"> <em>frames</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>channel</em> = <code>0</code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [inline, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Take a channel of the <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> object as inputs to the filter and replace with corresponding outputs. </p>
<p>The <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> argument reference is returned. The <code>channel</code> argument must be less than the number of channels in the <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> argument (the first channel is specified by 0). However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> exception. </p>
<p>Implements <a class="el" href="classstk_1_1Filter.html#a3260a238824c4a748ac057b84b7d3f21">stk::Filter</a>.</p>
<p><div class="fragment"><pre class="fragment"><a name="l00133"></a>00133 {
<a name="l00134"></a>00134 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00135"></a>00135 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( channel >= frames.channels() ) {
<a name="l00136"></a>00136 oStream_ << <span class="stringliteral">"BiQuad::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00137"></a>00137 <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
<a name="l00138"></a>00138 }
<a name="l00139"></a>00139 <span class="preprocessor">#endif</span>
<a name="l00140"></a>00140 <span class="preprocessor"></span>
<a name="l00141"></a>00141 StkFloat *samples = &frames[channel];
<a name="l00142"></a>00142 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> hop = frames.channels();
<a name="l00143"></a>00143 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<frames.frames(); i++, samples += hop ) {
<a name="l00144"></a>00144 inputs_[0] = gain_ * *samples;
<a name="l00145"></a>00145 *samples = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
<a name="l00146"></a>00146 *samples -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
<a name="l00147"></a>00147 inputs_[2] = inputs_[1];
<a name="l00148"></a>00148 inputs_[1] = inputs_[0];
<a name="l00149"></a>00149 outputs_[2] = outputs_[1];
<a name="l00150"></a>00150 outputs_[1] = *samples;
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152
<a name="l00153"></a>00153 lastFrame_[0] = outputs_[1];
<a name="l00154"></a>00154 <span class="keywordflow">return</span> frames;
<a name="l00155"></a>00155 }
</pre></div></p>
</div>
</div>
<a class="anchor" id="ac9836f0e074ea9516727f27eb9b411aa"></a><!-- doxytag: member="stk::BiQuad::tick" ref="ac9836f0e074ea9516727f27eb9b411aa" args="(StkFrames &iFrames, StkFrames &oFrames, unsigned int iChannel=0, unsigned int oChannel=0)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & stk::BiQuad::tick </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
<td class="paramname"> <em>iFrames</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstk_1_1StkFrames.html">StkFrames</a> & </td>
<td class="paramname"> <em>oFrames</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>iChannel</em> = <code>0</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>oChannel</em> = <code>0</code></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td><code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Take a channel of the <code>iFrames</code> object as inputs to the filter and write outputs to the <code>oFrames</code> object. </p>
<p>The <code>iFrames</code> object reference is returned. Each channel argument must be less than the number of channels in the corresponding <a class="el" href="classstk_1_1StkFrames.html" title="An STK class to handle vectorized audio data.">StkFrames</a> argument (the first channel is specified by 0). However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an <a class="el" href="classstk_1_1StkError.html" title="STK error handling class.">StkError</a> exception. </p>
<p><div class="fragment"><pre class="fragment"><a name="l00158"></a>00158 {
<a name="l00159"></a>00159 <span class="preprocessor">#if defined(_STK_DEBUG_)</span>
<a name="l00160"></a>00160 <span class="preprocessor"></span> <span class="keywordflow">if</span> ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
<a name="l00161"></a>00161 oStream_ << <span class="stringliteral">"BiQuad::tick(): channel and StkFrames arguments are incompatible!"</span>;
<a name="l00162"></a>00162 <a class="code" href="classstk_1_1Stk.html#a48ac73a0d8ca28445ba1a054e1f061ff" title="Static function for error reporting and handling using c-strings.">handleError</a>( StkError::FUNCTION_ARGUMENT );
<a name="l00163"></a>00163 }
<a name="l00164"></a>00164 <span class="preprocessor">#endif</span>
<a name="l00165"></a>00165 <span class="preprocessor"></span>
<a name="l00166"></a>00166 StkFloat *iSamples = &iFrames[iChannel];
<a name="l00167"></a>00167 StkFloat *oSamples = &oFrames[oChannel];
<a name="l00168"></a>00168 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> iHop = iFrames.channels(), oHop = oFrames.channels();
<a name="l00169"></a>00169 <span class="keywordflow">for</span> ( <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
<a name="l00170"></a>00170 inputs_[0] = gain_ * *iSamples;
<a name="l00171"></a>00171 *oSamples = b_[0] * inputs_[0] + b_[1] * inputs_[1] + b_[2] * inputs_[2];
<a name="l00172"></a>00172 *oSamples -= a_[2] * outputs_[2] + a_[1] * outputs_[1];
<a name="l00173"></a>00173 inputs_[2] = inputs_[1];
<a name="l00174"></a>00174 inputs_[1] = inputs_[0];
<a name="l00175"></a>00175 outputs_[2] = outputs_[1];
<a name="l00176"></a>00176 outputs_[1] = *oSamples;
<a name="l00177"></a>00177 }
<a name="l00178"></a>00178
<a name="l00179"></a>00179 lastFrame_[0] = outputs_[1];
<a name="l00180"></a>00180 <span class="keywordflow">return</span> iFrames;
<a name="l00181"></a>00181 }
</pre></div></p>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="BiQuad_8h_source.html">BiQuad.h</a></li>
</ul>
</div>
<HR>
<table>
<tr><td><A HREF="http://ccrma.stanford.edu/software/stk/"><I>The Synthesis ToolKit in C++ (STK)</I></A></td></tr>
<tr><td>©1995-2012 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
</table>
</BODY>
</HTML>
|
