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Class guinea.logic.TAFCTest

java.lang.Object
   |
   +----guinea.logic.Test
           |
           +----guinea.logic.GenericTest
                   |
                   +----guinea.logic.GenericABCTest
                           |
                           +----guinea.logic.TAFCTest

public class TAFCTest

extends GenericABCTest

implements PropertyLoader

The test uses the procedures and terms described in

Levitt H. (1971) Transformed Up-Down Methods in Psychoacoustics

See Also:

TAFCRule

Variable Index

· answerName

The question ID used to log the answer.

· buttonPressed

Did the subject press a button (indicates heard a difference, etc.) within given time between TAFC trials.

· initialLevel

Initial level for signal B at the start of test item's test procedure.

· logTrial

Whether to log the trials list of this item.

· maxRuns

The maximum number of runs for this TAFC test.

· pauseLength

Length of pause (in milliseconds) between TAFC trials.

· rule

The TAFC rule object for this test.

· ruleType

The rule type number.

· sampleB

The sample for signal B.

· sampleRef

The reference sample the sample B is compared with.

· stepSize

The step size of a step in a TAFC test.

· trialAnswerName

The question ID used to log the trial list (if trials logging is enabled via logTrial variable.

Constructor Index

· TAFCTest()

Construct a new TAFC test object.

Method Index

· endItem()

Add the result of the TAFC procedure to the subject.

· getRule(int)

Get a TAFC rule object.

· initItemSamples_base()

Initialize samples for this item.

· initTest()

Initialize the TAFC rule object for use in this test.

· propertyLoad(Properties, String)

Read parameters for this test from the properties.

· runSequence()

Run the TAFC procedure for this item.

· runSequence2()

Play the sample sequence.

Variables

 protected transient Sample sampleB

The sample for signal B. Sample B's level is controlled by the current TAFC rule.

 protected transient Sample sampleRef

The reference sample the sample B is compared with.

 protected Volume initialLevel

Initial level for signal B at the start of test item's test procedure. Default level is +0.0dB (1.0 linear).

 protected Volume stepSize

The step size of a step in a TAFC test. Default is 3.0dB.

 protected int maxRuns

 protected TAFCRule rule

The TAFC rule object for this test.

 protected int ruleType

 protected boolean buttonPressed

 protected long pauseLength

 protected String answerName

The question ID used to log the answer.

 protected boolean logTrial

 protected String trialAnswerName

The question ID used to log the trial list (if trials logging is enabled via logTrial variable.

Constructors

 public TAFCTest()

Methods

 public void initTest() throws Exception

Initialize the TAFC rule object for use in this test. It calls super-classes initTest() method to do default stuff. In addition it creates and initializes a TAFC rule object for the test.

Throws: Exception

an exception is thrown if player initialization fails for some reason.

Overrides:

initTest in class Test

 protected TAFCRule getRule(int type)

Get a TAFC rule object.

Parameters:

type - Type of rule. Only rule 1 is currently implemented.

Returns:

A TAFC rule object.

See Also:

TAFCRule1

 protected void runSequence() throws InterruptedException

Run the TAFC procedure for this item. It plays the selected fixed sample sequence and waits for answer for a period. Then the TAFC rule is called to record the result. Then rule decides whether TAFC procedure should continue or finish.

Throws: InterruptedException

an exception is thrown if sequence was interrupted for some reason .

Overrides:

runSequence in class GenericTest

See Also:

rule, TAFCRule

 protected void runSequence2() throws InterruptedException

Play the sample sequence. This is essentially the same as superclasses runSequence() method. It has some minor tuning for TAFC test.

Throws: InterruptedException

an exception is thrown if sequence was interrupted for some reason .

See Also:

runSequence

 protected void initItemSamples_base() throws Exception

Initialize samples for this item.

Throws: Exception

an exception is thrown if item samples initialization fails for some reason.

Overrides:

initItemSamples_base in class GenericABCTest

 protected void endItem()

Add the result of the TAFC procedure to the subject. It is done this way because there is no actual UI components that could give this kind of answer directly. The answer is calculated based of a series of answers from the subject. Optionally, the procedure's trial list can also be logged.

Overrides:

endItem in class Test

 public void propertyLoad(Properties p,
                          String name) throws IllegalArgumentException

Read parameters for this test from the properties.

Parameters:

p - the properties.

name - the name of this object (not usually used)

Throws: IllegalArgumentException

thrown if parameters are wrong.

Overrides:

propertyLoad in class GenericABCTest

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