Meas 2021 July 8 Part 2

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8/7/2021 Meas 2021 July 8 Part 2 https://forms.office.com/Pages/ResponsePage.aspx?id=K3EXCvNtXUKAjjCd8ope60_E5LGpsJVDo_abJAuvijNUMEhCSTJRR1pXMThOVDFLW… 1/10 Meas 2021 July 8 Part 2 Every question can have more than a single good answer  Ciao Luca, quando invierai il modulo, il proprietario potrà vedere il tuo nome e l'indirizzo di posta elettronica. 1 Cross spectrum and cross correlation (2 punti) They are linked through the coherence function There is no mutual link They are the same thing, just expressed with different terms The cross spectrum is the Fourier T ransform of the cross correlation function The phase of the two functions has to be the same 2 The product of a spectral line by its complex conjugate gives (2 punti) The imaginary part The real part The phase The amplitude squared The amplitude 8/7/2021 Meas 2021 July 8 Part 2 https://forms.office.com/Pages/ResponsePage.aspx?id=K3EXCvNtXUKAjjCd8ope60_E5LGpsJVDo_abJAuvijNUMEhCSTJRR1pXMThOVDFLW… 2/10 3 The following are the spectra of different windows, by which it is possible to appreciate the filtering capability, just looking at their shape. The rectangular window is (1 punto) d) b) c) e) a) 4 The following are the spectra of different windows, by which it is possible to appreciate the filtering capability, just looking at their shape. The Flat-top window is (1 punto) 8/7/2021 Meas 2021 July 8 Part 2 https://forms.office.com/Pages/ResponsePage.aspx?id=K3EXCvNtXUKAjjCd8ope60_E5LGpsJVDo_abJAuvijNUMEhCSTJRR1pXMThOVDFLW… 3/10 b) e) c) d) a) 5 The image is taken from a quartz accelerometer datasheet. Let’s consider the two lines related to Spectral noise in two different bandwidths: these data express some quantity measured as the output when no acceleration is provided to the accelerometer. These values are…