net.beadsproject.beads.ugens

Class BiquadCustomCoeffCalculator

java.lang.Object

net.beadsproject.beads.ugens.BiquadCustomCoeffCalculator

public class BiquadCustomCoeffCalculator
extends java.lang.Object

BiquadCustomCoeffCalculator provides a mechanism to define custom filter coefficients for a BiquadFilter based on frequency and Q. Users can create their own coefficient calculator classes by extending this class and passing it to a BiquadFilter instance with BiquadFilter.setType(int).

An instance of such a custom class should override calcCoeffs(float, float, float) to define the coefficient calculation algorithm. The floats a0, a1, a2, b0, b1, and b2 should be set according to the input parameters freq, q, and gain, as well as the useful class variables sampFreq and two_pi_over_sf.

Version:

.9.1

Author:

Benito Crawford

Field Summary

Fields

Modifier and Type	Field and Description
float	a0
float	a1
float	a2
float	b0
float	b1
float	b2
protected float	sampFreq The sampling frequency.
protected float	two_pi_over_sf Two * pi / sampling frequency.

Method Summary

Modifier and Type	Method and Description
void	calcCoeffs(float freq, float q, float gain) Override this function with code that sets a0, a1, etc. in terms of frequency, Q, and sampling frequency.
void	setSamplingFrequency(float sf) Sets the sampling frequency.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

a0

public float a0

a1

public float a1

a2

public float a2

b0

public float b0

b1

public float b1

b2

public float b2

sampFreq

protected float sampFreq

The sampling frequency.

two_pi_over_sf

protected float two_pi_over_sf

Two * pi / sampling frequency.

Method Detail

setSamplingFrequency

public void setSamplingFrequency(float sf)

Sets the sampling frequency.

Parameters:

sf - The sampling frequency in Hertz.

calcCoeffs

public void calcCoeffs(float freq,
                       float q,
                       float gain)

Override this function with code that sets a0, a1, etc. in terms of frequency, Q, and sampling frequency.

Parameters:

freq - The frequency of the filter in Hertz.

q - The Q-value of the filter.

gain - The gain of the filter.