Hi, I have 500k lines of data. One column is time the other sound pressure. I want to run an FFT to get into frequency domain but I'm finding this hard. Then I want convert this to dB and then I'll A-weight this output. Most important is the FFT first. Around 6 seconds of data sampled at 50K Hz. rapidly loosing the will to live. Cheers R

# MATLAB: FFT conversion of sound pressure in the time domain.

fft simple array

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