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Spectrum Viewer

Spectrum Viewer Overview

You can use the Spectrum Viewer for estimating and analyzing a signal's power spectral density (PSD). You can use the PSD estimates to understand a signal's frequency content.

The Spectrum Viewer provides the following functionality.

  • Analyze and compare spectral density plots.

  • Use different spectral estimation methods to create spectra:

  • Modify power spectral density parameters such as FFT length, window type, and sample frequency.

  • Print spectral plots.

Opening the Spectrum Viewer

To open the Spectrum Viewer and create a PSD estimate from SPTool:

  1. Select a signal from the Signal list box in SPTool.

  2. Click Create in the Spectra list.

  3. Click Apply in the Spectrum Viewer.

To open the Spectrum Viewer with a PSD estimate already listed in SPTool:

  1. Select a PSD estimate from the Spectra list box in SPTool.

  2. Click View in the Spectra list.

For example:

  1. Select mtlb in the default Signals list in SPTool.

  2. Click Create in SPTool to open the Spectrum Viewer.

  3. Click Apply in the Spectrum Viewer to plot the spectrum.

The Spectrum Viewer has the following components:

  • A signal identification region that provides information about the signal whose power spectral density estimate is displayed

  • A Parameters region for modifying the PSD parameters

  • A display region for analyzing spectra and an Options menu for modifying display characteristics

  • Spectrum management controls

    • Inherit from menu to inherit PSD specifications from another PSD object listed in the menu

    • Revert button to revert to the named PSD's original specifications

    • Apply button for creating or updating PSD estimates

  • A toolbar with buttons for convenient access to frequently used functions



    Print and print preview

    Zoom the signal in and out

    Select one of several loaded signals

    Set the display color and line style of a signal

    Toggle the markers on and off

    Set marker types

    Turn on the What's This help

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