(a) shows the periodogram and shows the modified periodogram using a Hanning window of the same data sequence with n = 64 samples. We know that the sequence consists of a number of sinusoids. By...

(a) shows the periodogram and shows the modified periodogram using a Hanning window of the same data sequence with n = 64 samples. We know that the sequence consists of a number of sinusoids. By studying the figures, what can you conclude about the sequence of data?