com.jsyn.unitgen

Class SpectralFilter

java.lang.Object

com.jsyn.unitgen.UnitGenerator

com.jsyn.unitgen.Circuit

com.jsyn.unitgen.SpectralFilter

All Implemented Interfaces:

UnitSink, UnitSource

public class SpectralFilter
extends Circuit
implements UnitSink, UnitSource

Process a signal using multiple overlapping FFT and IFFT pairs. For passthrough, you can connect the spectral outputs to the spectral inputs. Or you can connect one or more SpectralProcessors between them.

 for (int i = 0; i < numFFTs; i++) {
     filter.getSpectralOutput(i).connect(processors[i].input);
     processors[i].output.connect(filter.getSpectralInput(i));
 }
 

See the example program "HearSpectralFilter.java". Note that this spectral API is experimental and may change at any time.

Author:

Phil Burk (C) 2014 Mobileer Inc

See Also:

SpectralProcessor

Field Summary

Fields

Modifier and Type	Field and Description
UnitInputPort	input
UnitOutputPort	output

Fields inherited from class com.jsyn.unitgen.UnitGenerator

FALSE, PORT_NAME_AMPLITUDE, PORT_NAME_CUTOFF, PORT_NAME_FREQUENCY, PORT_NAME_FREQUENCY_SCALER, PORT_NAME_INPUT, PORT_NAME_OUTPUT, PORT_NAME_PAN, PORT_NAME_PHASE, PORT_NAME_PRESSURE, PORT_NAME_TIMBRE, PORT_NAME_TIME, synthesisEngine, TRUE, VERY_SMALL_FLOAT

Constructor Summary

Constructors

Constructor and Description
SpectralFilter() Create a default sized filter with 2 FFT/IFFT pairs and a sizeLog2 of Spectrum.DEFAULT_SIZE_LOG_2.
SpectralFilter(int numFFTs, int sizeLog2)

Method Summary

Modifier and Type	Method and Description
UnitInputPort	getInput()
UnitOutputPort	getOutput()
UnitSpectralInputPort	getSpectralInput(int i)
UnitSpectralOutputPort	getSpectralOutput(int i)
SpectralWindow	getWindow()
void	setWindow(SpectralWindow window) Specify one window to be used for all FFTs and IFFTs.

Methods inherited from class com.jsyn.unitgen.Circuit

add, addPortAlias, flattenOutputs, generate, getPortByName, setEnabled, setFrameRate, setSynthesisEngine, usePreset

Methods inherited from class com.jsyn.unitgen.UnitGenerator

addPort, addPort, autoStop, convertHalfLifeToMultiplier, convertTimeToRate, generate, getCircuit, getFramePeriod, getFrameRate, getId, getPorts, getSynthesisEngine, getSynthesizer, getTopUnit, getUnitGenerator, incrementWrapPhase, isEnabled, isStartRequired, printConnections, printConnections, printConnections, pullData, setCircuit, setPort, start, start, start, stop, stop, stop

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.jsyn.unitgen.UnitSink

getUnitGenerator, start, start, stop, stop

Methods inherited from interface com.jsyn.unitgen.UnitSource

getUnitGenerator

Field Detail

input

public UnitInputPort input

output

public UnitOutputPort output

Constructor Detail

SpectralFilter

public SpectralFilter()

Create a default sized filter with 2 FFT/IFFT pairs and a sizeLog2 of Spectrum.DEFAULT_SIZE_LOG_2.

SpectralFilter

public SpectralFilter(int numFFTs,
                      int sizeLog2)

Parameters:

numFFTs - number of FFT/IFFT pairs for the overlap and add

sizeLog2 - for example, use 10 to get a 1024 bin FFT, 12 for 4096

Method Detail

getWindow

public SpectralWindow getWindow()

setWindow

public void setWindow(SpectralWindow window)

Specify one window to be used for all FFTs and IFFTs. The window should be the same size as the FFTs.

Parameters:

window - default is HammingWindow

See Also:

SpectralWindowFactory

getOutput

public UnitOutputPort getOutput()

Specified by:

getOutput in interface UnitSource

getInput

public UnitInputPort getInput()

Specified by:

getInput in interface UnitSink

getSpectralOutput

public UnitSpectralOutputPort getSpectralOutput(int i)

Parameters:

i -

Returns:

the output of the indexed FFT

getSpectralInput

public UnitSpectralInputPort getSpectralInput(int i)

Parameters:

i -

Returns:

the input of the indexed IFFT