sptool (Signal Processing Toolbox)

Interactive digital signal processing tool

Syntax

```
sptool
```

Description

sptool opens SPTool, a graphical user interface (GUI) that manages a suite of four other GUIs: Signal Browser, Filter Designer, FVTool, and Spectrum Viewer. These GUIs provide access to many of the signal, filter, and spectral analysis functions in the toolbox. When you type sptool at the command line, the SPTool GUI opens.

Using SPTool you can

Analyze signals listed in the Signals list box with the Signal Browser
Design or edit filters with the Filter Designer (includes a Pole/Zero Editor)
Analyze filter responses for filters listed in the Filters list box with FVTool
Apply filters in the Filters list box to signals in the Signals list box
Create and analyze signal spectra with the Spectrum Viewer
Print the Signal Browser, Filter Designer, and Spectrum Viewer

You can activate the four integrated signal processing GUIs from SPTool.

Signal Browser

The Signal Browser allows you to view, measure, and analyze the time-domain information of one or more signals. To activate the Signal Browser, press the View button under the Signals list box in SPTool.

Filter Designer

The Filter Designer allows you to design and edit FIR and IIR filters of various lengths and types, with standard (lowpass, highpass, bandpass, bandstop, and multiband) configurations. To activate the Filter Designer, press either the New button or the Edit button under the Filters list box in SPTool.

The Filter Designer has a Pole/Zero Editor you can access from the Algorithms pulldown.

Filter Visualization Tool

The Filter Visualization Tool (fvtool) allows you to view the characteristics of a designed or imported filter, including its magnitude response, phase response, group delay, phase delay, pole-zero plot, impulse response, and step response. To activate FVTool, click the View button under the Filters list box in SPTool.

Spectrum Viewer

The Spectrum Viewer allows you to analyze frequency-domain data graphically using a variety of methods of spectral density estimation, including the Burg method, the FFT method, the multitaper method, the MUSIC eigenvector method, Welch's method, and the Yule-Walker autogressive method. To activate the Spectrum Viewer:

Click the Create button under the Spectra list box to compute the power spectral density for a signal selected in the Signals list box in SPTool. You may need to click Apply to view the spectra.
Click the View button to analyze spectra selected under the Spectra list box in SPTool.
Click the Update button under the Spectra list box in SPTool to modify a selected power spectral density signal.

In addition, you can right-click in any plot display area of the GUIs to modify signal properties.

See Chapter 6, "SPTool: A Signal Processing GUI Suite, for a full discussion of how to use SPTool.

See Also

fdatool, fvtool

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