This implements the Tukey window function described here: http://en.wikipedia.org/wiki/File:Window_function_(Tukey;alpha%3D_0.5).png This is alternate implementation of what Roads (1996 p 170, 2001 p 88) typically refers to as a quasi-Gaussian window. More...

#include <TTTukeyWindow.h>

Inheritance diagram for TukeyWindow:

Collaboration diagram for TukeyWindow:

Protected Member Functions
TTErr	calculateValue (const TTFloat64 &x, TTFloat64 &y, TTPtrSizedInt data)
	Calculate y = f(x) for a single value. More...

TTErr	processAudio (TTAudioSignalArrayPtr inputs, TTAudioSignalArrayPtr outputs)
	A standard audio processing method as used by TTBlue objects. More...

TTErr	test (TTValue &returnedTestInfo)
	Unit test for the window function unit. More...

Protected Attributes
TTFloat64	mAlpha
	ratio of window fades to total window duration. 0 <= alpha <= 1., 0 = no fades, 1 = no sustain

Detailed Description

This implements the Tukey window function described here: http://en.wikipedia.org/wiki/File:Window_function_(Tukey;alpha%3D_0.5).png This is alternate implementation of what Roads (1996 p 170, 2001 p 88) typically refers to as a quasi-Gaussian window.

It is easier to ensure that x and y values will scale properly with this formula as opposed to the one given by Roads.

Where 0. <= x <= 1. and 0. <= mAlpha <= 1.: y = 0.5 * (1 + cos ( pi * ((twoOverAlpha * x) - 1))) : for the attack = 1 : for the sustain = 0.5 * (1 + cos ( pi * ((twoOverAlpha * x) - twoOverAlpha + 1))) : for the release

Definition at line 42 of file TTTukeyWindow.h.

Member Function Documentation

TTErr TukeyWindow::calculateValue	(	const TTFloat64 &	x,
		TTFloat64 &	y,
		TTPtrSizedInt	data
	)

inlineprotected

Calculate y = f(x) for a single value.

Parameters

x	The input value to the window function.
y	The resulting value for the window function.
data	Not used.

Returns: TTErr error code if the method fails to execute, else kTTErrNone.

Definition at line 53 of file TTTukeyWindow.cpp.

References kTTErrNone, kTTPi, and mAlpha.

Referenced by processAudio().

TTErr TukeyWindow::processAudio	(	TTAudioSignalArrayPtr	inputs,
		TTAudioSignalArrayPtr	outputs
	)

protected

A standard audio processing method as used by TTBlue objects.

Parameters

inputs	The input vector that is to be processed.
outputs	The resulting windowed vector.

Returns: TTErr error code if the method fails to execute, else kTTErrNone.

Definition at line 78 of file TTTukeyWindow.cpp.

References calculateValue().

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TTErr TukeyWindow::test ( TTValue & returnedTestInfo )

protectedvirtual

Unit test for the window function unit.

Parameters

returnedTestInfo The outcome from the performed unit test.

Returns: TTErr error code if the method fails to execute, else kTTErrNone.

Reimplemented from TTAudioObjectBase.

Definition at line 58 of file TTTukeyWindow.test.cpp.

References TTAudioSignal::allocWithVectorSize(), TTAudioSignal::mSampleVectors, TTAudioObjectBase::process(), TTObjectBase::setAttributeValue(), TT, TTObjectBaseInstantiate(), and TTObjectBaseRelease().

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The documentation for this class was generated from the following files:

Protected Member Functions

Protected Attributes

Detailed Description

Member Function Documentation