Class BiquadFilterNode

java.lang.Object

com.codename1.media.audio.AudioNode

com.codename1.media.audio.BiquadFilterNode

public final class BiquadFilterNode
extends AudioNode

A second order filter, the Web Audio BiquadFilterNode: low and high pass, band pass, shelves, peaking, notch and all pass. Coefficients follow the specification's formulas and are recomputed per sample only while a parameter changes. The output has the input's channel count.

Method Summary

Modifier and Type	Method	Description
AudioParam	getDetune()	A detune of the frequency in cents, 0 by default.
AudioParam	getFrequency()	The cutoff or center frequency in Hz, 350 by default.
void	getFrequencyResponse(float[] frequencyHz, float[] magResponse, float[] phaseResponse)	Computes the response of the filter, with the parameters' current values, at each of frequencyHz.
AudioParam	getGain()	The boost in dB for the shelves and peaking, 0 by default.
AudioParam	getQ()	The quality factor, 1 by default: resonance in dB for low and high pass, width for band pass, peaking, notch and all pass.
BiquadFilterType	getType()	The filter type.
void	setType(BiquadFilterType type)	Sets the filter type.

Methods inherited from class AudioNode

connect, connect, connect, connect, disconnect, disconnect, disconnect, disconnect, disconnect, getChannelCount, getChannelCountMode, getChannelInterpretation, getContext, getNumberOfInputs, getNumberOfOutputs, setChannelCount, setChannelCountMode, setChannelInterpretation

Methods inherited from class Object

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

Method Details

getFrequency

public AudioParam getFrequency()

The cutoff or center frequency in Hz, 350 by default.

Returns

the parameter

getDetune

public AudioParam getDetune()

A detune of the frequency in cents, 0 by default.

Returns

the parameter

getQ

public AudioParam getQ()

The quality factor, 1 by default: resonance in dB for low and high pass, width for band pass, peaking, notch and all pass. Unused by the shelves.

Returns

the parameter

getGain

public AudioParam getGain()

The boost in dB for the shelves and peaking, 0 by default.

Returns

the parameter

getType

public BiquadFilterType getType()

The filter type.

Returns

the type

setType

public void setType(BiquadFilterType type)

Sets the filter type.

Parameters

• type: the type

getFrequencyResponse

public void getFrequencyResponse(float[] frequencyHz,
 float[] magResponse,
 float[] phaseResponse)

Computes the response of the filter, with the parameters' current values, at each of frequencyHz.

Parameters

• frequencyHz: the frequencies to evaluate

• magResponse: receives the linear magnitude at each frequency

• phaseResponse: receives the phase in radians at each frequency