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stk::ReedTable Class Reference

STK reed table class. More...

#include <ReedTable.h>

Inheritance diagram for stk::ReedTable:
stk::Function stk::Stk

Public Member Functions

 ReedTable (void)
 Default constructor.
 
void setOffset (StkFloat offset)
 Set the table offset value. More...
 
void setSlope (StkFloat slope)
 Set the table slope value. More...
 
StkFloat tick (StkFloat input)
 Take one sample input and map to one sample of output.
 
StkFramestick (StkFrames &frames, unsigned int channel=0)
 Take a channel of the StkFrames object as inputs to the table and replace with corresponding 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 table and write outputs to the oFrames object. More...
 
- Public Member Functions inherited from stk::Function
 Function (void)
 Class constructor.
 
StkFloat lastOut (void) const
 Return the last computed output sample.
 
- 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

STK reed table class.

This class implements a simple one breakpoint, non-linear reed function, as described by Smith (1986). This function is based on a memoryless non-linear spring model of the reed (the reed mass is ignored) which saturates when the reed collides with the mouthpiece facing.

See McIntyre, Schumacher, & Woodhouse (1983), Smith (1986), Hirschman, Cook, Scavone, and others for more information.

by Perry R. Cook and Gary P. Scavone, 1995–2014.

Member Function Documentation

void stk::ReedTable::setOffset ( StkFloat  offset)
inline

Set the table offset value.

The table offset roughly corresponds to the size of the initial reed tip opening (a greater offset represents a smaller opening).

39 { offset_ = offset; };
void stk::ReedTable::setSlope ( StkFloat  slope)
inline

Set the table slope value.

The table slope roughly corresponds to the reed stiffness (a greater slope represents a harder reed).

47 { slope_ = slope; };
StkFrames & stk::ReedTable::tick ( StkFrames frames,
unsigned int  channel = 0 
)
inline

Take a channel of the StkFrames object as inputs to the table and replace with corresponding outputs.

The StkFrames argument reference is returned. The channel argument must be less than the number of channels in 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.

99 {
100 #if defined(_STK_DEBUG_)
101  if ( channel >= frames.channels() ) {
102  oStream_ << "ReedTable::tick(): channel and StkFrames arguments are incompatible!";
103  handleError( StkError::FUNCTION_ARGUMENT );
104  }
105 #endif
106 
107  StkFloat *samples = &frames[channel];
108  unsigned int hop = frames.channels();
109  for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
110  *samples = offset_ + (slope_ * *samples);
111  if ( *samples > 1.0) *samples = 1.0;
112  if ( *samples < -1.0) *samples = -1.0;
113  }
114 
115  lastFrame_[0] = *(samples-hop);
116  return frames;
117 }
StkFrames & stk::ReedTable::tick ( StkFrames iFrames,
StkFrames oFrames,
unsigned int  iChannel = 0,
unsigned int  oChannel = 0 
)
inline

Take a channel of the iFrames object as inputs to the table and write outputs to the oFrames object.

The iFrames object reference is returned. Each channel argument must be less than the number of channels in the corresponding 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.

120 {
121 #if defined(_STK_DEBUG_)
122  if ( iChannel >= iFrames.channels() || oChannel >= oFrames.channels() ) {
123  oStream_ << "ReedTable::tick(): channel and StkFrames arguments are incompatible!";
124  handleError( StkError::FUNCTION_ARGUMENT );
125  }
126 #endif
127 
128  StkFloat *iSamples = &iFrames[iChannel];
129  StkFloat *oSamples = &oFrames[oChannel];
130  unsigned int iHop = iFrames.channels(), oHop = oFrames.channels();
131  for ( unsigned int i=0; i<iFrames.frames(); i++, iSamples += iHop, oSamples += oHop ) {
132  *oSamples = offset_ + (slope_ * *iSamples);
133  if ( *oSamples > 1.0) *oSamples = 1.0;
134  if ( *oSamples < -1.0) *oSamples = -1.0;
135  }
136 
137  lastFrame_[0] = *(oSamples-oHop);
138  return iFrames;
139 }

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.