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OnePole Class Reference

#include <OnePole.h>

Inheritance diagram for OnePole:

Filter Stk List of all members.

Detailed Description

STK one-pole filter class.

This protected Filter subclass implements a one-pole digital filter. A method is provided for setting the pole position along the real axis of the z-plane while maintaining a constant peak filter gain.

by Perry R. Cook and Gary P. Scavone, 1995 - 2007.


Public Member Functions

 OnePole ()
 Default constructor creates a first-order low-pass filter.
 OnePole (StkFloat thePole)
 Overloaded constructor which sets the pole position during instantiation.
 ~OnePole ()
 Class destructor.
void clear (void)
 Clears the internal state of the filter.
void setB0 (StkFloat b0)
 Set the b[0] coefficient value.
void setA1 (StkFloat a1)
 Set the a[1] coefficient value.
void setPole (StkFloat thePole)
 Set the pole position in the z-plane.
void setGain (StkFloat gain)
 Set the filter gain.
StkFloat getGain (void) const
 Return the current filter gain.
StkFloat lastOut (void) const
 Return the last computed output value.
StkFloat tick (StkFloat sample)
 Input one sample to the filter and return one output.
StkFramestick (StkFrames &frames, unsigned int channel=0)
 Take a channel of the StkFrames object as inputs to the filter and replace with corresponding outputs.


Member Function Documentation

void OnePole::setPole StkFloat  thePole  ) 
 

Set the pole position in the z-plane.

This method sets the pole position along the real-axis of the z-plane and normalizes the coefficients for a maximum gain of one. A positive pole value produces a low-pass filter, while a negative pole value produces a high-pass filter. This method does not affect the filter gain value.

void OnePole::setGain StkFloat  gain  )  [virtual]
 

Set the filter gain.

The gain is applied at the filter input and does not affect the coefficient values. The default gain value is 1.0.

Reimplemented from Filter.

StkFrames& OnePole::tick StkFrames frames,
unsigned int  channel = 0
[virtual]
 

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

The channel argument should be zero or greater (the first channel is specified by 0). An StkError will be thrown if the channel argument is equal to or greater than the number of channels in the StkFrames object.

Reimplemented from Filter.


The documentation for this class was generated from the following file:
The Synthesis ToolKit in C++ (STK)
©1995-2007 Perry R. Cook and Gary P. Scavone. All Rights Reserved.