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stk::JCRev Class Reference

John Chowning's reverberator class. More...

#include <JCRev.h>

Inheritance diagram for stk::JCRev:
stk::Effect stk::Stk

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. More...
 
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. More...
 
StkFramestick (StkFrames &frames, unsigned int channel=0)
 Take a channel of the StkFrames object as inputs to the effect and replace with stereo outputs. More...
 
StkFramestick (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. More...
 
- Public Member Functions inherited from stk::Effect
 Effect (void)
 Class constructor.
 
unsigned int channelsOut (void) const
 Return the number of output channels for the class.
 
const StkFrameslastFrame (void) const
 Return an StkFrames reference to the last output sample frame.
 
virtual void setEffectMix (StkFloat mix)
 Set the mixture of input and "effected" levels in the output (0.0 = input only, 1.0 = effect only).
 
- Public Member Functions inherited from stk::Stk
void ignoreSampleRateChange (bool ignore=true)
 A function to enable/disable the automatic updating of class data when the STK sample rate changes. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from stk::Stk
static StkFloat sampleRate (void)
 Static method that returns the current STK sample rate.
 
static void setSampleRate (StkFloat rate)
 Static method that sets the STK sample rate. More...
 
static std::string rawwavePath (void)
 Static method that returns the current rawwave path.
 
static void setRawwavePath (std::string path)
 Static method that sets the STK rawwave path.
 
static void swap16 (unsigned char *ptr)
 Static method that byte-swaps a 16-bit data type.
 
static void swap32 (unsigned char *ptr)
 Static method that byte-swaps a 32-bit data type.
 
static void swap64 (unsigned char *ptr)
 Static method that byte-swaps a 64-bit data type.
 
static void sleep (unsigned long milliseconds)
 Static cross-platform method to sleep for a number of milliseconds.
 
static bool inRange (StkFloat value, StkFloat min, StkFloat max)
 Static method to check whether a value is within a specified range.
 
static void handleError (const char *message, StkError::Type type)
 Static function for error reporting and handling using c-strings.
 
static void handleError (std::string message, StkError::Type type)
 Static function for error reporting and handling using c++ strings.
 
static void showWarnings (bool status)
 Toggle display of WARNING and STATUS messages.
 
static void printErrors (bool status)
 Toggle display of error messages before throwing exceptions.
 
- Static Public Attributes inherited from stk::Stk
static const StkFormat STK_SINT8
 
static const StkFormat STK_SINT16
 
static const StkFormat STK_SINT24
 
static const StkFormat STK_SINT32
 
static const StkFormat STK_FLOAT32
 
static const StkFormat STK_FLOAT64
 
- Protected Member Functions inherited from stk::Stk
 Stk (void)
 Default constructor.
 
virtual ~Stk (void)
 Class destructor.
 
virtual void sampleRateChanged (StkFloat newRate, StkFloat oldRate)
 This function should be implemented in subclasses that depend on the sample rate.
 
void addSampleRateAlert (Stk *ptr)
 Add class pointer to list for sample rate change notification.
 
void removeSampleRateAlert (Stk *ptr)
 Remove class pointer from list for sample rate change notification.
 
void handleError (StkError::Type type) const
 Internal function for error reporting that assumes message in oStream_ variable.
 

Detailed Description

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, 1995–2014.

Member Function Documentation

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.

101 {
102 #if defined(_STK_DEBUG_)
103  if ( channel > 1 ) {
104  oStream_ << "JCRev::lastOut(): channel argument must be less than 2!";
105  handleError( StkError::FUNCTION_ARGUMENT );
106  }
107 #endif
108 
109  return lastFrame_[channel];
110 }
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.

113 {
114 #if defined(_STK_DEBUG_)
115  if ( channel > 1 ) {
116  oStream_ << "JCRev::tick(): channel argument must be less than 2!";
117  handleError( StkError::FUNCTION_ARGUMENT );
118  }
119 #endif
120 
121  StkFloat temp, temp0, temp1, temp2, temp3, temp4, temp5, temp6;
122  StkFloat filtout;
123 
124  temp = allpassDelays_[0].lastOut();
125  temp0 = allpassCoefficient_ * temp;
126  temp0 += input;
127  allpassDelays_[0].tick(temp0);
128  temp0 = -(allpassCoefficient_ * temp0) + temp;
129 
130  temp = allpassDelays_[1].lastOut();
131  temp1 = allpassCoefficient_ * temp;
132  temp1 += temp0;
133  allpassDelays_[1].tick(temp1);
134  temp1 = -(allpassCoefficient_ * temp1) + temp;
135 
136  temp = allpassDelays_[2].lastOut();
137  temp2 = allpassCoefficient_ * temp;
138  temp2 += temp1;
139  allpassDelays_[2].tick(temp2);
140  temp2 = -(allpassCoefficient_ * temp2) + temp;
141 
142  temp3 = temp2 + ( combFilters_[0].tick( combCoefficient_[0] * combDelays_[0].lastOut() ) );
143  temp4 = temp2 + ( combFilters_[1].tick( combCoefficient_[1] * combDelays_[1].lastOut() ) );
144  temp5 = temp2 + ( combFilters_[2].tick( combCoefficient_[2] * combDelays_[2].lastOut() ) );
145  temp6 = temp2 + ( combFilters_[3].tick( combCoefficient_[3] * combDelays_[3].lastOut() ) );
146 
147  combDelays_[0].tick(temp3);
148  combDelays_[1].tick(temp4);
149  combDelays_[2].tick(temp5);
150  combDelays_[3].tick(temp6);
151 
152  filtout = temp3 + temp4 + temp5 + temp6;
153 
154  lastFrame_[0] = effectMix_ * (outLeftDelay_.tick(filtout));
155  lastFrame_[1] = effectMix_ * (outRightDelay_.tick(filtout));
156  temp = (1.0 - effectMix_) * input;
157  lastFrame_[0] += temp;
158  lastFrame_[1] += temp;
159 
160  return 0.7 * lastFrame_[channel];
161 }
StkFrames& stk::JCRev::tick ( StkFrames frames,
unsigned int  channel = 0 
)

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 documentation for this class was generated from the following file:

The Synthesis ToolKit in C++ (STK)
©1995--2014 Perry R. Cook and Gary P. Scavone. All Rights Reserved.