How can i import a signal and make its frequency as an input parameter.

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sharko playeur 2020-8-26

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关闭： MATLAB Answer Bot 2021-8-20

Hi,

I created a signal in the matlab workspace and i want to import it to simulink and be able to change its frequency.

The vector that describe my signal is this one : [[5:0.25:10]/10,ones(1,15),zeros(1,65)]

I tried to use the repeating sequence block but i could not set the frequency as an input. So i would like to know if its possible to import this signal to Simulink and have the frequency as a parameter so i can change it.

This signal will be generated by a DSP, and i would like to communicate with the it to change the frequency so i really need it as an input parameter

Thank you

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Answer 1

Fangjun Jiang 2020-8-26

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Your data has 101 points (or 100 intervals). The period of the signal is 1/F, where F is your frequency. So you need to do

Data=[[5:0.25:10]/10,ones(1,15),zeros(1,65)];
F=1;
Time=linspace(0,1/F,numel(Data))

Then use Data and Time to specify the Repeating Sequence block

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sharko playeur 2020-8-26

Thanks for your answer ! How can I declare F in a Simulink block ?

Fangjun Jiang 2020-8-27

In this case, "F" would be a parameter to your model but not a time-varying signal. Specify the time for the Repeating Sequence block as "linspace(0,1/F,101)" and change the value of F before every simulation, but not during a simulation.