edu.cmu.emulator.signal
Class ScaleFactorWorker

java.lang.Object
  edu.cmu.emulator.signal.ScaleFactorWorker

public class ScaleFactorWorker
extends Object

A simplistic brute force approach to finding the best mult/shift factors to achieve a given dB gain Functions for reference (20 because we're doing voltage): dB = 20 * log(scaleFactor) scaleFactor = 10^(dB/20)

Field Summary

(package private) int[]	bestMF
(package private) double[]	bestRawDB
(package private) int[]	bestSF
(package private) boolean	clipOutOfRange
private static double	dbResolution
private static double	invDBResolution
protected Logger	log
private static int	MAX_SHIFT
(package private) double	maxDB
(package private) int	maxMFBits
(package private) int	maxShift
(package private) double	minDB
(package private) double[]	minError
(package private) int	numDBBins
private static double	SLOP
(package private) double[]	val

Constructor Summary

ScaleFactorWorker(int maxMFBits, int maxShift, double minDB, double maxDB)

Method Summary

private int	bitsRequired(int mf, int sf)
double	computeDB(double scaleFactor)
private double	computeDB(int multFactor, int shiftFactor)
private int	dbBin(double db)
void	displayAvailableDB()
void	displayResults()
double	getDBAbove(double db)
double	getDBBelow(double db)
byte	getMultFactor(double db)
byte	getShiftFactor(double db)
boolean	isValidDB(double db, double errorTolerance)
private double	lba(double x, double base)
static void	main(String[] args)
void	searchForMinError()
void	setClipOutOfRange(boolean clipOutOfRange)

Methods inherited from class java.lang.Object

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

Field Detail

maxMFBits

int maxMFBits

maxShift

int maxShift

minDB

double minDB

maxDB

double maxDB

numDBBins

int numDBBins

val

double[] val

minError

double[] minError

bestMF

int[] bestMF

bestSF

int[] bestSF

bestRawDB

double[] bestRawDB

clipOutOfRange

boolean clipOutOfRange

dbResolution

private static final double dbResolution

See Also:

Constant Field Values

invDBResolution

private static final double invDBResolution

See Also:

Constant Field Values

MAX_SHIFT

private static final int MAX_SHIFT

See Also:

Constant Field Values

SLOP

private static final double SLOP

See Also:

Constant Field Values

log

protected Logger log

Constructor Detail

ScaleFactorWorker

public ScaleFactorWorker(int maxMFBits,
                         int maxShift,
                         double minDB,
                         double maxDB)

Method Detail

setClipOutOfRange

public void setClipOutOfRange(boolean clipOutOfRange)

dbBin

private int dbBin(double db)

searchForMinError

public void searchForMinError()

bitsRequired

private int bitsRequired(int mf,
                         int sf)

lba

private double lba(double x,
                   double base)

computeDB

private double computeDB(int multFactor,
                         int shiftFactor)

computeDB

public double computeDB(double scaleFactor)

getMultFactor

public byte getMultFactor(double db)

getShiftFactor

public byte getShiftFactor(double db)

displayResults

public void displayResults()

displayAvailableDB

public void displayAvailableDB()

isValidDB

public boolean isValidDB(double db,
                         double errorTolerance)

getDBAbove

public double getDBAbove(double db)

getDBBelow

public double getDBBelow(double db)

main

public static void main(String[] args)