ddf.minim.effects
Class LowPassSP

java.lang.Object
  ddf.minim.effects.IIRFilter
      ddf.minim.effects.LowPassSP

All Implemented Interfaces:

AudioEffect

public class LowPassSP

extends IIRFilter

LowPassSP is a single pole low pass filter. It is not super great, but it gets the job done.

Author:

Damien Di Fede

Field Summary

Fields inherited from class ddf.minim.effects.IIRFilter

a, b

Constructor Summary

LowPassSP(float freq, float sampleRate)
Constructs a low pass filter with a cutoff frequency of freq that will be used to filter audio recorded at sampleRate.

Method Summary

protected void

calcCoeff() Calculates the coefficients of the filter using the current cutoff frequency.

Methods inherited from class ddf.minim.effects.IIRFilter

frequency, printCoeff, process, process, sampleRate, setFreq, validFreq

Methods inherited from class java.lang.Object

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

Constructor Detail

LowPassSP

public LowPassSP(float freq,
                 float sampleRate)

Constructs a low pass filter with a cutoff frequency of freq that will be used to filter audio recorded at sampleRate.

Parameters:

freq - the cutoff frequency

sampleRate - the sample rate of the audio that will be filtered

Method Detail

calcCoeff

protected void calcCoeff()

Description copied from class: IIRFilter

Calculates the coefficients of the filter using the current cutoff frequency. To make your own IIRFilters, you must extend IIRFilter and implement this function. The frequency is expressed as a fraction of the sample rate. When filling the coefficient arrays, be aware that b[0] corresponds to the coefficient b1.

Specified by:

calcCoeff in class IIRFilter