Counting Consecutive Threshold Crossings in a Signal (Counting Oscillations)

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Fawad Farooq Ashraf 2022-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/1821533-counting-consecutive-threshold-crossings-in-a-signal-counting-oscillations

评论： Fawad Farooq Ashraf 2022-10-11

I have an oscillating signal in a SIMULINK model and I want to count the number of times it crosses a certain threshold level (positive and negative) consecutively. How can I do that? There is a built-in block for Zero-Crossings Counter but what can I use to solve my problem?

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Answer 1

Allen 2022-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/1821533-counting-consecutive-threshold-crossings-in-a-signal-counting-oscillations#answer_1070708

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You can accomplish a check against a threshold using the following code or a slight variation to meet other needs.

% Generating a random signal for demonstration purposes
S = 40*rand([1,100])-20;
% Define your threshold
threshold = 0;
count = nnz(diff(sign(S-threshold)));

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Fawad Farooq Ashraf 2022-10-11

Thank you for your reply. But unfortunately, I have to do this in real-time for a moving signal (i.e., I'll just have single values of the signal at each time step) and I have to use SIMULINK blocks for the implementation.

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