I have one question about digital correction of signal after RC filter which is high-pass.
Let me explain detail.
I have one simple signal conditioner. It has RC filter on the signal input with cut-off frequency equals 1.3 Hz. It means that after this RC filter my signal has lower amplitude from 1.3 Hz to approximately 15 Hz. After ADC I get this signal on my computer in digital form. After that I use Fourier transform.
Unfortunately, I need correct amplitude information in range 2-20Hz. So I need correct amplitude of signal in that range by digital transformations.
Can I do this? Is it normal practice?