A feedback system is described by v(n) = x(n) + 0.25y(n) y(n) = v(n-1) The transfer function H(z) = Y(z)/X(z) is:

A continuous-time signal has the Fourier transform X(ω) = U(ω + 60π) – U(ω – 60π) where ω is measured in rad/s. The signal is sampled with sampling period T = 0.02 sec. There will be no aliasing.

A periodic signal has a fundamental angular frequency of 30π rad/s and nonzero Fourier-series coefficients at every integer harmonic. It is passed through an ideal bandpass filter that passes 45π < |ω| < 105π rad/s and rejects all other frequencies. Which positive-frequency spectral components remain in the output?

The continuous-time sinusoid x(t) = cos(2π(700)t) is sampled at fs = 1000 samples/sec. What is its aliased frequency in the interval 0

The transfer function for the system shown below is:  

The filter y(n) = 2[x(n) – x(n-4)] is excited by x(n) = 3u(n-1). The steady-state output lim[n -> infinity] y(n) is:

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Absorbed radiation dose is usually measured in which SI unit?

Which of the following is classified as nonionizing radiation?

The anode of an x-ray tube is usually made of: