Package org.noise_planet.noisemodelling.pathfinder.utils

Class AcousticIndicatorsFunctions

java.lang.Object

org.noise_planet.noisemodelling.pathfinder.utils.AcousticIndicatorsFunctions

public class AcousticIndicatorsFunctions
extends Object

A utility class providing acoustic indicator functions for computations, including conversions between decibels and energy, summation and multiplication of arrays, and operations specific to octave bands.

Constructor Summary

Constructors

Constructor	Description
AcousticIndicatorsFunctions()

Method Summary

Modifier and Type	Method	Description
static Integer[]	asOctaveBands(int[] thirdOctaveBands)	Create new array by taking middle third octave bands
static Double[]	asOctaveBands(Double[] thirdOctaveBands)	Create new array by taking middle third octave bands
static Integer[]	asOctaveBands(Integer[] thirdOctaveBands)	Create new array by taking middle third octave bands
static double	dBToW(double dB)	Convert Decibel to Watt
static double[]	dBToW(double[] dB)	Convert Decibel to Watt
static double[]	multiplicationArray(double[] array, double coefficient)	Multiply component of two same size array
static double[]	multiplicationArray(double[] array1, double[] array2)	Multiply component of two same size array
static double	sumArray(double[] energeticSum)	Sum of all the components of this given list
static double[]	sumArray(double[] array, double number)
static double[]	sumArray(double[] array1, double[] array2)	Element wise sum array without any other operations.
static double	sumArray(int nbfreq, double[] energeticSum)	sum the first nbfreq values in a given array
static double[]	sumArrayWithPonderation(double[] array1, double[] array2, double p)	Eq 2.5.9 The ‘long-term’ sound level along a path starting from a given point source is obtained from the logarithmic sum of the weighted sound energy in homogeneous conditions and the sound energy in favourable conditions.
static double	sumDbArray(double[] array1)	Sum of all the decibel components of this given list
static double[]	sumDbArray(double[] array1, double[] array2)	energetic Sum of two same size dB array
static double[]	twoDgtAftrComma(double[] valeurs)
static double	wToDb(double w)	Convert Watt to Decibel
static double[]	wToDb(double[] w)	Convert Watt to Decibel

Methods inherited from class java.lang.Object

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

Constructor Detail

AcousticIndicatorsFunctions

public AcousticIndicatorsFunctions()

Method Detail

dBToW

public static double dBToW(double dB)

Convert Decibel to Watt

Parameters:

dB - Sound power spectrum in dB (or dBa , no weighting is done here)

Returns:

Watt value

dBToW

public static double[] dBToW(double[] dB)

Convert Decibel to Watt

Parameters:

dB - Sound power spectrum in dB (or dBa , no weighting is done here)

Returns:

Watt value

wToDb

public static double wToDb(double w)

Convert Watt to Decibel

Parameters:

w -

Returns:

Decibel value

wToDb

public static double[] wToDb(double[] w)

Convert Watt to Decibel

Parameters:

w -

Returns:

Decibel value

twoDgtAftrComma

public static double[] twoDgtAftrComma(double[] valeurs)

sumArrayWithPonderation

public static double[] sumArrayWithPonderation(double[] array1,
                                               double[] array2,
                                               double p)

Eq 2.5.9 The ‘long-term’ sound level along a path starting from a given point source is obtained from the logarithmic sum of the weighted sound energy in homogeneous conditions and the sound energy in favourable conditions.

Parameters:

array1 - double array

array2 - double array

p - the mean occurrence p of favourable conditions in the direction of the path (S,R)

Returns:

sumDbArray

public static double[] sumDbArray(double[] array1,
                                  double[] array2)

energetic Sum of two same size dB array

Parameters:

array1 -

array2 -

Returns:

sumDbArray

public static double sumDbArray(double[] array1)

Sum of all the decibel components of this given list

Parameters:

array1 -

Returns:

the sum in decibel

multiplicationArray

public static double[] multiplicationArray(double[] array1,
                                           double[] array2)

Multiply component of two same size array

Parameters:

array1 -

array2 -

Returns:

multiplicationArray

public static double[] multiplicationArray(double[] array,
                                           double coefficient)

Multiply component of two same size array

Parameters:

array - Array input

coefficient - number to multiply at each index

Returns:

Array multiplied

sumArray

public static double sumArray(int nbfreq,
                              double[] energeticSum)

sum the first nbfreq values in a given array

Parameters:

nbfreq -

energeticSum -

Returns:

the sum value

sumArray

public static double sumArray(double[] energeticSum)

Sum of all the components of this given list

Parameters:

energeticSum -

Returns:

sum value

sumArray

public static double[] sumArray(double[] array1,
                                double[] array2)

Element wise sum array without any other operations.

Parameters:

array1 - First array

array2 - Second array

Returns:

Sum of the two arrays

sumArray

public static double[] sumArray(double[] array,
                                double number)

asOctaveBands

public static Double[] asOctaveBands(Double[] thirdOctaveBands)

Create new array by taking middle third octave bands

Parameters:

thirdOctaveBands - Third octave bands array

Returns:

Octave bands array

asOctaveBands

public static Integer[] asOctaveBands(Integer[] thirdOctaveBands)

Create new array by taking middle third octave bands

Parameters:

thirdOctaveBands - Third octave bands array

Returns:

Octave bands array

asOctaveBands

public static Integer[] asOctaveBands(int[] thirdOctaveBands)

Create new array by taking middle third octave bands

Parameters:

thirdOctaveBands - Third octave bands array

Returns:

Octave bands array