From: Richello on 18 Jan 2010 10:22 Dear Sir, Could you please help me to solve this or give me hints to do so? An analogue signal x(t)=10cos(500πt) is sampled at 0, T,2T, .... with T=1ms. I want to find a cosine y(t), whose frequency is as close as possible to that of x(t), which when sampled with T=1ms yields the same sample values as x(t). how can I get the equation of y(t)? .. then if x(nT) were the input to a D/A converter, followed by a lowpass smoothing filter, why would the output be x(t) and not y(t) ?

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