Need help with getting a function to SIMULINK

Hello, I am producing a FM Signal using the following message signal

fs=1000;

t = 0:1/fs:2;

m =@(t) -sawtooth(2*pi*(t+0.5)) ;

I want to input this m function as it is to SIMULINK using simin block to repeat the same modulation process but with blocks. Sorry for it's a silly question, but im still new with SIMULINK. Thanks in advance

Answer 1

[Bhavana Sapparapu]

Hi Abdelrhman Abdelfatah,

I understand that you want to create a Simulink source block that can generate an FM signal using the "m" function that you have provided. This is same as loading a "timeseries" data generated using the "m" function into the Simulink model using a "From Workspace" (simin) block.

The following documentation provides an example as to how to load timeseries data using the "simin" block in a Simulink model:

https://in.mathworks.com/help/simulink/ug/load-data-using-the-from-workspace-block.html

More specifically, look at the "Load timeseries Data" section in the documentation:

https://in.mathworks.com/help/simulink/ug/load-data-using-the-from-workspace-block.html#d124e224885

As shown in the example, you can do the following in your Simulink file:

• Create a "Callback Button" block, populate the "ClickFcn" with the following code and click on the button (or) go to Model Settings > Model Properties > Callbacks and populate the "InitFcn" with the following code:

        fs = 1000;
        t = 0:1/fs:2;
        m = @(t)-sawtooth(2*pi*(t+0.5));
        d = m(t);
        simin = timeseries(d,t);

• Add a "From Workspace" (simin) block to your Simulink model.
• Connect it to a "Scope" block or an "Out" block to view the results.
• Change the simulation "Stop Time" to 2.0s (since your upper bound for t is 2).
• Update the model and run.

The result would look like something as follows: