(a) Try to represent the amplitude spectrum and the phase spectrum of a sawtooth one directly beneath the other as in Exercise 1. Select amplitude spectrum on channel 0 in the menu of the module "frequency domain" and "phase spectrum" on channel 1. Select "standard setting" (sampling rate and block length = 1024 = 210 in the A/D button of the upper control bar) and a low frequency (f = 1; 2; 4; 8 Hz. What do you discover if you choose a frequency whose value cannot be given as a power of two?
(b) Select the different phase modifications π (1800), π/2 (900), π/3 (600) and π/4 (450) for the sawtooth in the menu of the generator module and observe the changes in the phase spectrum in each case.
(c) Do the phase spectra from Exercise 2 agree with the 3D representation in Illustration 28 ff.? Note deviations and try to find an explanation for the possible erroneous calculation of the phase spectrum.
(d) Experiment with various settings for the sample rate and block length (A/D button on the upper control bar, but select both values in the same size, e.g. 32, 256, 1024!)
