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stk::Wurley Class Reference

STK Wurlitzer electric piano FM synthesis instrument. More...

#include <Wurley.h>

Inheritance diagram for stk::Wurley:
stk::FM stk::Instrmnt stk::Stk

List of all members.

Public Member Functions

 Wurley (void)
 Class constructor.
 ~Wurley (void)
 Class destructor.
void setFrequency (StkFloat frequency)
 Set instrument parameters for a particular frequency.
void noteOn (StkFloat frequency, StkFloat amplitude)
 Start a note with the given frequency and amplitude.
StkFloat tick (unsigned int channel=0)
 Compute and return one output sample.
StkFramestick (StkFrames &frames, unsigned int channel=0)
 Fill a channel of the StkFrames object with computed outputs.

Detailed Description

STK Wurlitzer electric piano FM synthesis instrument.

This class implements two simple FM Pairs summed together, also referred to as algorithm 5 of the TX81Z.

    Algorithm 5 is :  4->3--\
                             + --> Out
                      2->1--/

Control Change Numbers:

The basic Chowning/Stanford FM patent expired in 1995, but there exist follow-on patents, mostly assigned to Yamaha. If you are of the type who should worry about this (making money) worry away.

by Perry R. Cook and Gary P. Scavone, 1995-2012.


Constructor & Destructor Documentation

stk::Wurley::Wurley ( void   ) 

Class constructor.

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


Member Function Documentation

StkFrames & stk::Wurley::tick ( StkFrames frames,
unsigned int  channel = 0 
) [inline, virtual]

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::FM.

00100 {
00101   unsigned int nChannels = lastFrame_.channels();
00102 #if defined(_STK_DEBUG_)
00103   if ( channel > frames.channels() - nChannels ) {
00104     oStream_ << "Wurley::tick(): channel and StkFrames arguments are incompatible!";
00105     handleError( StkError::FUNCTION_ARGUMENT );
00106   }
00107 #endif
00108 
00109   StkFloat *samples = &frames[channel];
00110   unsigned int j, hop = frames.channels() - nChannels;
00111   if ( nChannels == 1 ) {
00112     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
00113       *samples++ = tick();
00114   }
00115   else {
00116     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
00117       *samples++ = tick();
00118       for ( j=1; j<nChannels; j++ )
00119         *samples++ = lastFrame_[j];
00120     }
00121   }
00122 
00123   return frames;
00124 }


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

The Synthesis ToolKit in C++ (STK)
©1995-2012 Perry R. Cook and Gary P. Scavone. All Rights Reserved.