audio.processing.eq

Class LowPassEffect

java.lang.Object

triana.types.audio.AudioEffect16Bit

audio.processing.eq.LowPassEffect

public class LowPassEffect
extends AudioEffect16Bit

A Comb-delay Effect which allows user to add a delayed signal onto the original by creating a feedforward and feedback Comb Filter based on a building block of a reverb device. The user can set the attenuation the level of the delayed signal and also adjust the delay time by adjusting the settings using the GUI.CombDelayEffect exends AudioEffect 16bit to allow for chunked data.

See Also:

CombDelay, triana.audio.AudioEffect16Bit

Field Summary

Fields inherited from class triana.types.audio.AudioEffect16Bit

ADD, DO_NOTHING, MULTIPLY

Constructor Summary

Constructors

Constructor and Description
LowPassEffect(int forwardMemSize, int feedback, java.lang.String filterType, boolean chunked, float delayInMs, float sampleRate) Creates an comb filter delay effect with a particular forward memory size.

Method Summary

Methods

Modifier and Type	Method and Description
short[]	combProcess(short[] input) Method for non chunked data.
short[]	combProcessChunked(short[] input) Method for chunked data.
short[]	process(short[] input) Process method calls appropriate combProcess or combProcessChunked method depending on the users decision to use or not chunked data.
void	setChunked(boolean chunk) Determines whether chunked data is being used or not.
void	setDelayOffset(float offset) Sets the delay size in samples that the delayed signal will be delayed by
void	setFeedback(int feed) Sets the feedback factor.
void	setFilterType(java.lang.String filt) Sets the type of filter to be used to create the delay.

Methods inherited from class triana.types.audio.AudioEffect16Bit

getData, getStart, initialiseForward, initialiseForward, preProcess, setForwardMathOperation

Methods inherited from class java.lang.Object

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

Constructor Detail

LowPassEffect

public LowPassEffect(int forwardMemSize,
             int feedback,
             java.lang.String filterType,
             boolean chunked,
             float delayInMs,
             float sampleRate)

Creates an comb filter delay effect with a particular forward memory size.

Parameters:

forwardMemSize - the size of the forward memory to be used by AudioEffect16bit class.

feedback - the level of attenutation of the delayed signal in the the feedback comb filter. Should be divided by 100 to give value in percent.

delayOffset - the size of the delay in samples. Used to calculate appropriate buffer size

filterType - sets which type of filter to use. Can be Standard Feedback Filter or Feedback Loop Only

chunked - boolean value to indicate if the user is using chunked data. Used by process method to choose suitable method.

Method Detail

setFeedback

public void setFeedback(int feed)

Sets the feedback factor. To be specific this sets how loud the delayed signal will be.

Parameters:

feed - the level of feedback. This value must be divided by 100 in order to be used, as the feedback factor must be less than 1.

setDelayOffset

public void setDelayOffset(float offset)

Sets the delay size in samples that the delayed signal will be delayed by

Parameters:

offset - this is the size of the delay in samples. This is used to set the forward buffer when using chunks, and also to calculate the size of the final output array.

setFilterType

public void setFilterType(java.lang.String filt)

Sets the type of filter to be used to create the delay. Can be Standard Feedback Filter or Feedback Loop Only

Parameters:

filt - the type of filter to create the delay

setChunked

public void setChunked(boolean chunk)

Determines whether chunked data is being used or not.

Parameters:

chunk - returns true if the user has indicated that chunked data is being used.

process

public short[] process(short[] input)

Process method calls appropriate combProcess or combProcessChunked method depending on the users decision to use or not chunked data.

Parameters:

input - short array containing the input data to be passed on to respective method

combProcess

public short[] combProcess(short[] input)

Method for non chunked data. Creates a delayed signal after the original data, and also acts as a feedback delay creating further delayed signals Works in 32bit (ints) to avoid any (unintentional) clipping from using shorts.

Parameters:

input - short array containing the input data to be manipulated by algorithm

combProcessChunked

public short[] combProcessChunked(short[] input)

Method for chunked data. Creates a delayed signal after the original data, and also acts as a feedback delay creating further delayed signals Works in 32bit (ints) to avoid any (unintentional) clipping from using shorts.

Parameters:

input - short array containing the input data to be manipulated by algorithm