MATLAB. PLEASE COMPLETE ALL PARTS. SHOW CODE AND SPECTROGRAM

4.1 Synthesize an Arpeggio and a Chord As we studied in the previous lab, a piano keyboard shown in Figure 2 is divided into octaves-the notes in one octave being twice the frequency of the notes in the next lower octave 28 30 32 33 35 37 39 40 42 444547 49 151 52 54 56 57 59 61 63 Middle-C A-440 Figure 2: Layout of a piano keyboard. Key numbers are shaded. The notation C4 means the C-key in the fourth octave, which is middle-C. The white keys in each octave are named A through G Use the technique of adding short sinusoids studied in Section 3.2, and create a signal that plays seven notes in succession: Ai. C5. E, As, Es. s. and A, starting each note at every 0.25s, .e., a new note should start with the starting times set at 10, 0.25, 0.5, 0.75, 1.0, 1.25, 1.5) seconds. The total duration of the musical passage should be 2.5s, i.e., ending the passag should be equal; the phases do not matter. Synthesize the signal with a sampling rate at f, 4000 Hz The first three notes should have a duration of 0.2 s, but the remaining four notes should be held until the end before the ending silence segment of 0.1 s kicks in, so their individual note durations will vary spectrogram (section length = 256) of the sum signal so that you can point out features that correspond to the parameters of the sinusoids: starting and ending imes, as well as frequencies e with silence. The amplitudes of all signals Make a