This procedure describes how to create a broadband noise model file controlled by one
parameter from a signal and its associated control profile.
Prerequisites: You must already have a sound file (a recording or simulation) of the target noise for
the model. This sound will have an associated profile that enables the software to estimate
the broadband model.
To create a model of a broadband noise source signal:
Open the existing noise signal. This signal must be associated with a profile (See
Associating a Profile with a Signal) that enables you to
estimate a broadband model which describes the sound depending on a specific parameter,
such as "meters per second".
Choose Modules > Sound Composer > Create a broadband noise model (1-control parameter) from current
window from the menu bar.
The Broad Band Noise Model Creation dialog box is
displayed.
You can choose which currently-opened signal to use from the Select
signal drop-down menu.
Select the control parameter of the model from the drop-down
menu.
The minimum and maximum values of the controlling parameter are displayed in the
Min - Max line of the dialog box as a reference.
Enter an Starting point for the controlling parameter. This
value does not need to be within the profile of the source. For example, if the minimum
value in the source is 5 m/s you may enter an initial value of "0".
Enter an Increment step.
If you would like to set advanced parameters, press the Advanced
parameters button in the dialog box.
Additional fields are displayed in the dialog box for Frequency
resolution and Window length. Values you enter in these
fields can help during the estimation of the model.
The Frequency Resolution is the step size between frequencies in the model.
The Window length is the sample size used to set the time resolution of the
model.
Click the Save button.
You are asked to enter a filename and location.
Click Save again to save the model to a file. Make sure to give
the model file a descriptive name and store it in a location where you will be able to
find it later.
A broadband noise model with one parameter can also be created manually by filling a
text file with a series of spectra, according to the expected file format described in Broadband Noise Sources.