Package noiseBandMonitor

Class BandData

java.lang.Object

noiseBandMonitor.BandData

public class BandData
extends Object

Class to create a set of octave or third octave bands using base-two exact steps according to the standard ANSI S1.11-2004.

Each band had a mid frequency, a band number and a name.

Author:

Doug Gillespie

Method Summary

Modifier and Type	Method	Description
static double	calcCentreFreq(int bandNumber)
static double	calcCentreFreq(int bandNumber, BandType bandType, double fNom)	Get a frequency for the centre of a ANSI standard band.
double[]	getBandCentres()
static double	getBandHalfWidth(BandType bandType)	Half width of a band = sqrt of the distance between band centres.
double[]	getBandHiEdges()
double[]	getBandLoEdges()
String[]	getBandNames()
int[]	getBandNumbers()
static int	getHighBandNumber(double frequency)	Get the lowest band number which has a centre frequency above the given frequency in Hz.
static int	getLowBandNumber(double frequency)	Get the highest band number which has a centre frequency below the given frequency in Hz.

Methods inherited from class java.lang.Object

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

Method Details

calcCentreFreq

public static double calcCentreFreq(int bandNumber)

calcCentreFreq

public static double calcCentreFreq(int bandNumber,
 BandType bandType,
 double fNom)

Get a frequency for the centre of a ANSI standard band. Band 30 is 1000Hz, and numbers are then 1/3 octaves either side of this. This means that we don't quite hit decadal values which is a possibility for parts of the standard.

Parameters:

bandNumber -

Returns:

getLowBandNumber

public static int getLowBandNumber(double frequency)

Get the highest band number which has a centre frequency below the given frequency in Hz.

Parameters:

frequency - Frequency in Hz

Returns:

Band number (30 = 1000 Hz).

getHighBandNumber

public static int getHighBandNumber(double frequency)

Get the lowest band number which has a centre frequency above the given frequency in Hz.

Parameters:

frequency - Frequency in Hz

Returns:

Band number (30 = 1000 Hz).

getBandHalfWidth

public static double getBandHalfWidth(BandType bandType)

Half width of a band = sqrt of the distance between band centres.

Parameters:

bandType -

Returns:

getBandNumbers

public int[] getBandNumbers()

Returns:

the bandNumbers

getBandCentres

public double[] getBandCentres()

Returns:

the bandCentres

getBandHiEdges

public double[] getBandHiEdges()

Returns:

the bandHiEdges

getBandLoEdges

public double[] getBandLoEdges()

Returns:

the bandLoEdges

getBandNames

public String[] getBandNames()

Returns:

the bandNames