How to extract the noise amplitude from a signal (Voltage) ?

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K G el 6 de Jun. de 2019

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https://es.mathworks.com/matlabcentral/answers/465825-how-to-extract-the-noise-amplitude-from-a-signal-voltage

Cerrada: Sabin el 13 de Mzo. de 2023

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I am looking for a methode to get the noise ( amplitude differences ) from the original Signal ( a voltage simulated with Simulink ) , ist there a Filter that save the noise variation? I tried to use SNR in Matlab but i needed the Power of each seperately which i dont have. Thanks in Advanced