How do I count the number of times zero is being crossed by a signal?

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Rajesh Siraskar 2020-1-8

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编辑： hossein 2022-2-2

采纳的回答： Fangjun Jiang

Hi,

I am trying to build a control system and I want to count the oscillations in a time-span of say 100 seconds.

Can I count the number of times a signal crosses zero (probably using MATLAB's zer-crossing detection algo.) to count the oscillations?

I want it to happen within Simulink - is there any other better way? I just want a count say 10, that tells me there were 10 oscillations.

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Fangjun Jiang 2020-1-8

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If you have the DSP toolbox, there is a Zero-Crossing counter block. If not, you can compare the signal with zero, which creates a square wave signal. Use the rising and falling edge to trig an triggered subsystem, inside which adding a Counter block.

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Rajesh Siraskar 2020-1-9

编辑：Rajesh Siraskar 2020-1-9

在 MATLAB Online 中打开

Fangjun - just a quick observation.

While this works stand-alone - do you know how to make it work in mixed signal cases?

I am actually building a Reinforcement Learning based control system and I am trying to penalize for oscillations and hence the need to count oscillations

When I put this solution into the whole scheme of things, I get an error. But thanks for the solution.

On the other hand if set the simulation as continous time then I get this error

Caused by:
    Error using rl.env.SimulinkEnvWithAgent/simWrapper (line 325)
    Error due to multiple causes.
        Error using Simulink.SimulationInput/sim
        Data type mismatch. The internal rule determines the output of
        'Stiction_TF_Valve_RL_VR_V11/RL Sub-System/Compute Rewards/Gain' to be a signal of data type
        'ufix32_En1000'. However, it is driving a signal of data type 'double'.
        Error using Simulink.SimulationInput/sim
        An error occurred while propagating data type 'uint16' from 'Stiction_TF_Valve_RL_VR_V11/RL
        Sub-System/Compute Rewards/Add', output port 1.

Fangjun Jiang 2020-1-9

I believe continuous solver should also work. You just need to add DataTypeConversion blocks to deal with those data type mismatches.

Rajesh Siraskar 2020-1-10

Make sense - will try. Thanks a lot for your guidance.

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Signal Processing DSP System Toolbox Signal Generation, Manipulation, and Analysis Signal Generation

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