Task 3 In the MATLAB code provided in Section 6 of the lab manual, we sampled the same sinusoid (1 kHz) in Task 2 at a l
-
- Site Admin
- Posts: 899603
- Joined: Mon Aug 02, 2021 8:13 am
Task 3 In the MATLAB code provided in Section 6 of the lab manual, we sampled the same sinusoid (1 kHz) in Task 2 at a l
6. Aliasing Now we sample the same sinusoid (1 kHz) in Section 5 at a lower sampling rate to observe the aliasing effects. You must have all the variables from the code in Section 5 in the MATLAB workspace for this to work. Also observe the impact of zero-order hold (ZOH) signal reconstruction on the quality of the output signal close all 11 -4a-101no_pts/a-111/fa a Yasin 12 i 1000 tique plot (t.yl.t_4.y_a): xlabel' (second)") label (y)) Legend ( axist(0,0.004,-1.2.1.21); ANA ") diaplay'apled at ikks, played at soundty_fs/a); specify sampling rate for the sound pause (25 pause fur 2 see to separate from the next sound and B 4 Check the frequency domain signal. Hetice that the replica of Figa! now in the audible cange the show. fr_a-t101no pts/a-315/no_pts a/ a-fr atlino pta/a/21 ta-absttttty_a}} Esqueo_pts/a/21/ toglogite, F,fr, ti, tr_at_alog-log scale xlabel(' ylabel (in Legend ("Continuous-tie 7, 777- Signal reconstruction: Use the interp: function to get the 3 (reco-order hold version of the signal at 44 kilz. The 208 version is how the signal would sound with a 44 D/A converter soundcard Its difference from the original is significant in both the time and frequency domain and its reproduction is quite poor. interpl(t_aya,t,'anarest','trap") VE bifft (y_ni net atlino pta/21/ta Figure met plet (t.yi,t,y al axis (10,0.004,-1.2.1.2131 vinkei xiabel('s second)) WAS label (yet) Legend (44kHz', 'te 11 reconstructed at 44k uning o's Flaure figure Loging (fe, F,fr, fl. fr. n alabel('') ylabel (lyit) Legend (Continuous-tine FT, FFT (844, FFT - LLARE reconstructed at 4ks wing 201¹) display('sampled at 44als,played at 4) sound(yl, fai pause (2) display (sampled at 11ks,played at 44) 7 sound(y_n.Es);