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John Chowning's reverberator class. More...
#include <JCRev.h>
Public Member Functions | |
JCRev (StkFloat T60=1.0) | |
Class constructor taking a T60 decay time argument (one second default value). | |
void | clear (void) |
Reset and clear all internal state. | |
void | setT60 (StkFloat T60) |
Set the reverberation T60 decay time. | |
StkFloat | lastOut (unsigned int channel=0) |
Return the specified channel value of the last computed stereo frame. | |
StkFloat | tick (StkFloat input, unsigned int channel=0) |
Input one sample to the effect and return the specified channel value of the computed stereo frame. | |
StkFrames & | tick (StkFrames &frames, unsigned int channel=0) |
Take a channel of the StkFrames object as inputs to the effect and replace with stereo outputs. | |
StkFrames & | tick (StkFrames &iFrames, StkFrames &oFrames, unsigned int iChannel=0, unsigned int oChannel=0) |
Take a channel of the iFrames object as inputs to the effect and write stereo outputs to the oFrames object. |
John Chowning's reverberator class.
This class takes a monophonic input signal and produces a stereo output signal. It is derived from the CLM JCRev function, which is based on the use of networks of simple allpass and comb delay filters. This class implements three series allpass units, followed by four parallel comb filters, and two decorrelation delay lines in parallel at the output.
Although not in the original JC reverberator, one-pole lowpass filters have been added inside the feedback comb filters.
by Perry R. Cook and Gary P. Scavone, 1995-2011.
StkFloat stk::JCRev::lastOut | ( | unsigned int | channel = 0 |
) | [inline] |
Return the specified channel value of the last computed stereo frame.
Use the lastFrame() function to get both values of the last computed stereo frame. The channel
argument must be 0 or 1 (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 StkError exception.
00101 { 00102 #if defined(_STK_DEBUG_) 00103 if ( channel > 1 ) { 00104 oStream_ << "JCRev::lastOut(): channel argument must be less than 2!"; 00105 handleError( StkError::FUNCTION_ARGUMENT ); 00106 } 00107 #endif 00108 00109 return lastFrame_[channel]; 00110 }
StkFloat stk::JCRev::tick | ( | StkFloat | input, | |
unsigned int | channel = 0 | |||
) | [inline] |
Input one sample to the effect and return the specified channel
value of the computed stereo frame.
Use the lastFrame() function to get both values of the computed stereo output frame. The channel
argument must be 0 or 1 (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 StkError exception.
00113 { 00114 #if defined(_STK_DEBUG_) 00115 if ( channel > 1 ) { 00116 oStream_ << "JCRev::tick(): channel argument must be less than 2!"; 00117 handleError( StkError::FUNCTION_ARGUMENT ); 00118 } 00119 #endif 00120 00121 StkFloat temp, temp0, temp1, temp2, temp3, temp4, temp5, temp6; 00122 StkFloat filtout; 00123 00124 temp = allpassDelays_[0].lastOut(); 00125 temp0 = allpassCoefficient_ * temp; 00126 temp0 += input; 00127 allpassDelays_[0].tick(temp0); 00128 temp0 = -(allpassCoefficient_ * temp0) + temp; 00129 00130 temp = allpassDelays_[1].lastOut(); 00131 temp1 = allpassCoefficient_ * temp; 00132 temp1 += temp0; 00133 allpassDelays_[1].tick(temp1); 00134 temp1 = -(allpassCoefficient_ * temp1) + temp; 00135 00136 temp = allpassDelays_[2].lastOut(); 00137 temp2 = allpassCoefficient_ * temp; 00138 temp2 += temp1; 00139 allpassDelays_[2].tick(temp2); 00140 temp2 = -(allpassCoefficient_ * temp2) + temp; 00141 00142 temp3 = temp2 + ( combFilters_[0].tick( combCoefficient_[0] * combDelays_[0].lastOut() ) ); 00143 temp4 = temp2 + ( combFilters_[1].tick( combCoefficient_[1] * combDelays_[1].lastOut() ) ); 00144 temp5 = temp2 + ( combFilters_[2].tick( combCoefficient_[2] * combDelays_[2].lastOut() ) ); 00145 temp6 = temp2 + ( combFilters_[3].tick( combCoefficient_[3] * combDelays_[3].lastOut() ) ); 00146 00147 combDelays_[0].tick(temp3); 00148 combDelays_[1].tick(temp4); 00149 combDelays_[2].tick(temp5); 00150 combDelays_[3].tick(temp6); 00151 00152 filtout = temp3 + temp4 + temp5 + temp6; 00153 00154 lastFrame_[0] = effectMix_ * (outLeftDelay_.tick(filtout)); 00155 lastFrame_[1] = effectMix_ * (outRightDelay_.tick(filtout)); 00156 temp = (1.0 - effectMix_) * input; 00157 lastFrame_[0] += temp; 00158 lastFrame_[1] += temp; 00159 00160 return 0.7 * lastFrame_[channel]; 00161 }
Take a channel of the StkFrames object as inputs to the effect and replace with stereo outputs.
The StkFrames argument reference is returned. The stereo outputs are written to the StkFrames argument starting at the specified channel
. Therefore, the channel
argument must be less than ( channels() - 1 ) of the StkFrames 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 StkError exception.
StkFrames& stk::JCRev::tick | ( | StkFrames & | iFrames, | |
StkFrames & | oFrames, | |||
unsigned int | iChannel = 0 , |
|||
unsigned int | oChannel = 0 | |||
) |
Take a channel of the iFrames
object as inputs to the effect and write stereo outputs to the oFrames
object.
The iFrames
object reference is returned. The iChannel
argument must be less than the number of channels in the iFrames
argument (the first channel is specified by 0). The oChannel
argument must be less than ( channels() - 1 ) of the oFrames
argument. However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an StkError exception.
The Synthesis ToolKit in C++ (STK) |
©1995-2011 Perry R. Cook and Gary P. Scavone. All Rights Reserved. |