Given the signals, x1(n), x2(n), x3(n), and x4(n) as shown in Figure 6.30. Let all the signals b

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Step 1:  
Understand the concept of pre-echo distortion. Pre-echo distortion occurs in transform

Given the signals, $x_1(n), x_2(n), x_3(n)$, and $x_4(n)$ as shown in Figure 6.30. Let all the signals be of length 1024 samples. When transform coded using a 512-point MDCT, which of the signals will result in pre-echo distortion?