de.quippy.javamod.multimedia.mod.mixer.interpolation

Class WindowedFIR

java.lang.Object

de.quippy.javamod.multimedia.mod.mixer.interpolation.WindowedFIR

public class WindowedFIR
extends Object

Since:

15.06.2006 This code is adopted from the great Mod Plug Tracker by Olivier Lapicque ------------------------------------------------------------------------------------------------ fir interpolation doc, (derived from "an engineer's guide to fir digital filters", n.j. loy) calculate coefficients for ideal lowpass filter (with cutoff = fc in 0..1 (mapped to 0..nyquist)) c[-N..N] = (i==0) ? fc : sin(fc*pi*i)/(pi*i) then apply selected window to coefficients c[-N..N] *= w(0..N) with n in 2*N and w(n) being a window function (see loy) then calculate gain and scale filter coefs to have unity gain. ------------------------------------------------------------------------------------------------

Author:

Daniel Becker

Field Summary

Fields

Modifier and Type	Field and Description
static int[]	lut
static int	WFIR_16BITSHIFT
static int	WFIR_FRACHALVE
static int	WFIR_FRACMASK
static int	WFIR_FRACSHIFT
static int	WFIR_POSFRACMASK

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

WFIR_16BITSHIFT

public static final int WFIR_16BITSHIFT

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Constant Field Values

WFIR_POSFRACMASK

public static final int WFIR_POSFRACMASK

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Constant Field Values

WFIR_FRACSHIFT

public static final int WFIR_FRACSHIFT

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Constant Field Values

WFIR_FRACMASK

public static final int WFIR_FRACMASK

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Constant Field Values

WFIR_FRACHALVE

public static final int WFIR_FRACHALVE

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Constant Field Values

lut

public static final int[] lut