User`s guide

Chirp
5-71
Open the Example 2 model by clicking here in the MATLAB Help Browser.
Run your model to see the time domain output, and then type the following
command to view the chirp output spectrogram.
specgram(dsp_examples_yout,[0:.01:40],400,hamming(128),110)
Example 3: When Sweep Time is Greater Than Target Time.
Setting Sweep time to 1.5
and leaving the rest of the parameters as in the Example 1 model gives the
following output. The sweep still reaches the
Target frequency (25 Hertz) at
the
Target time (1 second), but since Sweep time is greater than Target time,
the sweep continues on its linear path until one
Sweep time (1.5 seconds) is
traversed.
Unexpected behavior may arise when you set
Sweep time greater than Target
time
; see “Example 4: Output Sweep with Negative Frequencies” for details.
TIME (s)
FREQUENCY
0 1 2 3 4 5
0
5
10
15
20
25
30
35
40
0 1 2 3 4 5 6
−10
−5
0
5
10
Frame: 6
TIME (s)
AMPLITUDE