Generate a random signal with varying frequencies and constant rms
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Hi
I am busy doing a project regarding the ISO 2631-1 filters that you apply to accelerometer data to evaluate human comfort. I am done with the filter design and is testing it at the moment.
I want to generate a random signal, x (time) and y (acceleration), where the signal has an RMS of 1, but the frequency of the signal varies. So I am currently extracting the dominant frequencies from my FFT data, so I want multiple frequencies to extract from the FFT. The frequencies of the signal should range between 0.1 Hz and 80 Hz.
Can anayone help please
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Garv Agarwal
2023년 7월 20일
Hi Daniel,
From my understanding, you want to generate a random signal with varying frequncy but constant rms value.
For generation the random frequencies, you can use the rand function-
r = minVal + (maxVal-minVal)*rand(sampleSize)
Then you can use these frequencies to create a sine wave.
The signal generated will then have to be normalized to have rms value of 1. You can do this by dividing the signal by its own rms value -
signal = signal/rms(signal)
You can read more about these functions, from the following documentations -
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