User`s guide

Viewing Signals
3-83
•Filter Type = Lowpass
•Design Method = FIR (Window)
•
Filter Order (Specify order) = 22
•Window Specifications (Window) = Hamming
•Frequency Specifications (wc) = 0.25
•Frequency Specifications (Units) = Normalized (0 to 1)
•Magnitude Specifications (Units) = dB
Specify the following parameter values in the Scope properties pane of the
Spectrum Scope block:
•
Buffer input =
•
Buffer size = 128
•Buffer overlap = 64
•Specify FFT length =
•
Number of spectral averages = 2
With these settings, the Spectrum Scope block buffers each input channel to a
new frame size of 128 (from the original frame size of 16) with an overlap of 64
samples between consecutive frames. Because
Specify FFT length is not
selected, the frame size of 128 is used as the number of frequency points in the
FFT. This is the number of points plotted for each channel every time the scope
display is updated.
You may want to set the
Stop time in the Simulation Parameters dialog box
to
inf to allow the simulation to run longer. See “Improving the Appearance of
the Display” on page 3-81 for some tips on improving the scope display.
Displaying Matrices
The Matrix Viewer block provides general matrix display capabilities that can
be used with all matrix signals (frame-based and sample-based).
Example: Displaying Matrices
In the model below, a matrix of shifted sinusoids is displayed with the Matrix
Viewer block.