Signal Processing Toolbox

Step 4: Analyzing a Signal

You can analyze and print signals using the Signal Browser. You can also play the signals if your computer has audio output capabilities.

For example, compare the signal noise to the filtered signal blnoise:

1. Shift+click on the noise and blnoise signals in the Signals list of SPTool to select both signals.
2. Press the View button under the Signals list.

1. The Signal Browser is activated and both signals are displayed in the display region. (The names of both signals are shown above the display region.) Initially, the original noise signal covers up the bandlimited blnoise signal.

3. Push the selection button on the toolbar, , to select the blnoise signal.

1. The display area is updated. Now you can see the blnoise signal superimposed on top of the noise signal. The signals are displayed in different colors in both the display region and the panner. You can change the color of the selected signal using the Line Properties button on the toolbar, .

   

Playing a Signal

When you press the Play button in the Signal Browser toolbar, , the active signal is played on the computer's audio hardware:

1. To hear a portion of the active (selected) signal
1. Use the vertical markers to select a portion of the signal you want to play. Vertical markers are enabled by the and buttons.
2. Press the Play button.
2. To hear the other signal
1. Select the signal as in step 3 above. You can also select the signal directly in the display region.
2. Press the Play button again.

Printing a Signal

You can print from the Signal Browser using the Print button, .

You can use the line display buttons to maximize the visual contrast between the signals by setting the line color for noise to gray and the line color for blnoise to white. Do this before printing two signals together.

Note    You can follow the same rules to print spectra, but you can't print filter responses directly from SPTool.

Use the Signal Browser region in the Preferences dialog box in SPTool to suppress printing of both the panner and the marker settings.

To print both signals, press the Print button in the Signal Browser toolbar.

Step 3: Applying a Filter to a Signal

Step 5: Spectral Analysis in the Spectrum Viewer

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