I would like to know why the fft of a perfect 1 kHz sinus of 2V amplitude gives a peak at 1 kHz of only 1.3V.
Is there a numerical explanation ?
The sinus was generated with the demo setup (when no device is plugged) and the spectral mode was set on linear amplitude and with a Blackman frame.
Maybe I am wrong but I thought that the amplitude given in the spectrum for a given frequency was the amplitude of the sinus compound of the function for that frequency.
Thanks for you help.