User`s guide

Creating Signals
3-37
•Amplitude
•Frequency
•Phase offset
•Sample time
•Samples per frame
In the model below, a Sine Wave block generates a frame-based (multichannel)
matrix containing three independent signals:
•Sine wave of amplitude 1 and frequency 100 Hz
•Sine wave of amplitude 3 and frequency 250 Hz
•Sine wave of amplitude 2 and frequency 500 Hz
Each channel has a frame size of 64 samples. The three signals are summed
point-by-point by a Matrix Sum block, and exported to the workspace.
To build the model, set the
Sum along parameter of the Matrix Sum block to
Rows, and make the following parameter settings in the Sine Wave block:
•Set
Amplitude to [132]. This specifies the amplitudes for three
independent sinusoids (and therefore dictates a three-column output).
•Set
Frequency to [100 250 500]. This specifies the frequency for each of
the output sinusoids.
•Set
Sample time to 1/5000. (This is ten times the highest sinusoid
frequency, and so satisfies the Nyquist criterion.)
•Set
Samples per frame to 64. This specifies a frame size of 64 for all
sinusoids (and therefore dictates a 64-row output).
After running the model, you can look at a portion of the resulting summed
sinusoid by typing
plot(yout(1:100))
at the command line.