How can i plot frequency response from 25000 time domain Data?
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Hello every body, I have near 25000 time domain data, they are from a idustrial plant, I have both input and output data. I want plot frequency response by using this time domain data, please help me how it is possible? Thanks alot.
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dpb
le 20 Mar 2015
Modifié(e) : dpb
le 20 Mar 2015
I think you're barking up the wrong tree first here; you need to learn something about signal processing and data collection basics first to ensure your data have any meaning before just applying tools. Perhaps the reason the results aren't what you expect is that the data aren't any good...
But, to see what frequency content is contained in the sampled data, there's a very good, concise example of an amplitude spectrum computed via the fft at
doc fft
The Signal Processing toolbox also has the function tfestimate for transfer function estimation and the spectrum function which has multitude of options for estimating spectra.
Again, however, unless there's something actually in the dataset you've collected, none of these can fix corrupted data obtained without adequate protection during that process, whatever it was.
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Image Analyst
le 20 Mar 2015
Look up pwelch() in the Signal Processing Toolbox: http://www.mathworks.com/products/signal/features.html#spectral-analysis
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