The Synthesis ToolKit in C++ (STK)

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stk::BlowHole Class Reference

STK clarinet physical model with one register hole and one tonehole. More...

`#include <BlowHole.h>`

Inheritance diagram for stk::BlowHole:

## Public Member Functions
| BlowHole (StkFloat lowestFrequency)
| Class constructor.
| ~BlowHole (void)
| Class destructor.
void | clear (void)
| Reset and clear all internal state.
void | setFrequency (StkFloat frequency)
| Set instrument parameters for a particular frequency.
void | setTonehole (StkFloat newValue)
| Set the tonehole state (0.0 = closed, 1.0 = fully open).
void | setVent (StkFloat newValue)
| Set the register hole state (0.0 = closed, 1.0 = fully open).
void | startBlowing (StkFloat amplitude, StkFloat rate)
| Apply breath pressure to instrument with given amplitude and rate of increase.
void | stopBlowing (StkFloat rate)
| Decrease breath pressure with given rate of decrease.
void | noteOn (StkFloat frequency, StkFloat amplitude)
| Start a note with the given frequency and amplitude.
void | noteOff (StkFloat amplitude)
| Stop a note with the given amplitude (speed of decay).
void | controlChange (int number, StkFloat value)
| Perform the control change specified by number and value (0.0 - 128.0).
StkFloat | tick (unsigned int channel=0)
| Compute and return one output sample.
StkFrames & | tick (StkFrames &frames, unsigned int channel=0)
| Fill a channel of the StkFrames object with computed outputs.
Public Member Functions inherited from stk::Instrmnt
| Instrmnt (void)
| Class constructor.
virtual void | clear (void)
| Reset and clear all internal state (for subclasses).
virtual void | noteOn (StkFloat frequency, StkFloat amplitude)=0
| Start a note with the given frequency and amplitude.
virtual void | noteOff (StkFloat amplitude)=0
| Stop a note with the given amplitude (speed of decay).
virtual void | setFrequency (StkFloat frequency)
| Set instrument parameters for a particular frequency.
virtual void | controlChange (int number, StkFloat value)
| Perform the control change specified by number and value (0.0 - 128.0).
unsigned int | channelsOut (void) const
| Return the number of output channels for the class.
const StkFrames & | lastFrame (void) const
| Return an StkFrames reference to the last output sample frame.
StkFloat | lastOut (unsigned int channel=0)
| Return the specified channel value of the last computed frame.
virtual StkFloat | tick (unsigned int channel=0)=0
| Compute one sample frame and return the specified `channel` value.
virtual StkFrames & | tick (StkFrames &frames, unsigned int channel=0)=0
| Fill the StkFrames object with computed sample frames, starting at the specified channel.
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.

## 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.
static void | clear_alertList ()
| Static method that frees memory from alertList_.
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 clarinet physical model with one register hole and one tonehole.

This class is based on the clarinet model, with the addition of a two-port register hole and a three-port dynamic tonehole implementation, as discussed by Scavone and Cook (1998).

In this implementation, the distances between the reed/register hole and tonehole/bell are fixed. As a result, both the tonehole and register hole will have variable influence on the playing frequency, which is dependent on the length of the air column. In addition, the highest playing freqeuency is limited by these fixed lengths.

This is a digital waveguide model, making its use possibly subject to patents held by Stanford University, Yamaha, and others.

Control Change Numbers:

- Reed Stiffness = 2
- Noise Gain = 4
- Tonehole State = 11
- Register State = 1
- Breath Pressure = 128

by Perry R. Cook and Gary P. Scavone, 1995–2023.

## Constructor & Destructor Documentation

## ◆ BlowHole()

stk::BlowHole::BlowHole | ( | StkFloat | lowestFrequency | ) |

Class constructor.

An StkError will be thrown if the rawwave path is incorrectly set.

## Member Function Documentation

## ◆ tick()

StkFrames & stk::BlowHole::tick | ( | StkFrames & | frames,
|  | unsigned int | channel = `0`
| ) |  |
| inlinevirtual

Fill a channel of the StkFrames object with computed outputs.

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.

Implements stk::Instrmnt.

157{
158 unsigned int nChannels = lastFrame_.channels();
159#if defined(_STK_DEBUG_)
160 if ( channel > frames.channels() - nChannels ) {
161 oStream_ << "BlowHole::tick(): channel and StkFrames arguments are incompatible!";
162 handleError( StkError::FUNCTION_ARGUMENT );
163 }
164#endif
165
166 StkFloat *samples = &frames[channel];
167 unsigned int j, hop = frames.channels() - nChannels;
168 if ( nChannels == 1 ) {
169 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
170 *samples++ = tick();
171 }
172 else {
173 for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
174 *samples++ = tick();
175 for ( j=1; j<nChannels; j++ )
176 *samples++ = lastFrame_[j];
177 }
178 }
179
180 return frames;
181}
stk::BlowHole::tick
StkFloat tick(unsigned int channel=0)
Compute and return one output sample.
Definition BlowHole.h:121
stk::StkFrames::channels
unsigned int channels(void) const
Return the number of channels represented by the data.
Definition Stk.h:416
stk::Stk::handleError
static void handleError(const char *message, StkError::Type type)
Static function for error reporting and handling using c-strings.

The documentation for this class was generated from the following file:

- BlowHole.h

The Synthesis ToolKit in C++ (STK)
©1995--2023 Perry R. Cook and Gary P. Scavone. All Rights Reserved.