The Calculate noise spectrum dialog


Period04 does also provide a function to calculate a noise spectrum. The correspoinding dialog can be accessed via the Special menu.

This dialog is very similar to the 'Calculate Noise at Frequency' dialog. However, for the noise spectrum the range and the step size have to be defined:
Frequency range: from/to Defines the frequency range for the noise spectrum.
Spacing: In order to construct a noise spectrum the noise will be calculated for certain frequencies in equidistant frequency steps. The "spacing" defines the size of these frequency steps.
Box size: determines the size of the frequency range to be used for the noise calculation:
[frequency-box/2, frequency+box/2]
Step rate: defines the accuracy of the frequency grid for the Fourier calculation. Three default options for the step quality are available and can be selected by the combo box: High, Medium and Low. In order to set a user-defined value select Custom and type the value into the text field next to the step rate combo-box. Please note: The smaller the step rate the longer the calculation will take.
Calculations based on Defines the type of data to be used for the calculation: Original data, Adjusted data, Residuals at original, Residuals at adjusted or Spectral window.

Click on Calculate to start the calculation. The resulting noise spectrum data will be displayed in the text box below.

You can export or print the content of the text box by pressing the appropriate button.