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Problem 4. (10 pts) Write x(t) = cos (2t -) in terms of x(t) Ce/2t C2e-j2¢...
Problem 6. (10 pts) Write down the following in the form of x(t) = A cos(2t + o), where A> 0 x(t) = sin(2t + 7) + cos2t
' cos(3t), t<n/2, 2. Let f(t) = sin(2t), 7/2<t< , Write f(t) in terms of the unit step e3 St. function. Then find c{f(t)}.
3(20%) Assume a message signal is given by m(t) = 4 cos(2π//) + cos(4π.t). Let x (t)-5m(t) cos(2t f t) + 5m(t) sin( 2 fct), where m(t) İs the Hilbert Transform of m(t). (10%) (a) Derive x(t) (10%) (b) Prove, by sketching the spectra, that x(t) is a lower-sideband SSB signal of m(t). 3(20%) Assume a message signal is given by m(t) = 4 cos(2π//) + cos(4π.t). Let x (t)-5m(t) cos(2t f t) + 5m(t) sin( 2 fct), where m(t)...
Find the general solution x(t) of: x'' + 4x = 3 cos(2t) + 4 cos(3t) using the method of undetermined coefficients.
Problem 4.(30 pts) Given the analog signal x(t) cos(2 cos(3t)+2 sin(4mt) A.(10 pts) Find the Nyquist frequency (sampling frequency) which guarantees That x() can be recovered from it's sampled version xIn] with no aliasing. B.(10 pts) If the sampling period of Ts 0.4 see is used identify all discrete frequencies Of the signal x(t), also indicate if this sampling period is adequate to recover x(t) from xn] C.(10 pts) Suppose signal x(t) is modulated by signal e(t) = cos(2000mt) what...
(10 points) This problem is related to Problem 9.31 in the text (a) A signal, s(t), with period T 5, is approximated by using the first few terms in the frequency domain by the following non-zero (complex) Fourier coefficients (all others are zero): S(0)--, 2 6 S(1)-S(-1)-π, S(3)-S(- approximation s (t), where 5 C(n)cos(nuot + %) (See Section 9.1.2 of the text.) Write the answer as the sum of cosines with phase. There should be no complex numbers in your...
Consider the parametric curve given by x(t) = 16 sin3(t), y(t) = 13 cos(t) − 5 cos(2t) − 2 cos(3t) − cos(4t), where t denotes an angle between 0 and 2π. (a) Sketch a graph of this parametric curve. (b) Write an integral representing the arc length of this curve. (c) Using Riemann sums and n = 8, estimate the arc length of this curve. (d) Write an expression for the exact area of the region enclosed by this curve.
Let z = 8x² + 16xy - 8y2 , where x(t,s) = cosh (2t) cos (6s) and y(t,s) = sinh (2t) sin (6s). (JUse the chain rule to compute of at (ts) = (4 in (2)ā) дz (ii) Use the Chain rule to compute de at (t.s) Exact values Required. No Radicals permitted. Use Only Integers Or Fully Reduced Fractions.
Please show all your works. Thanks. 4.(25 pts) Consider a periodic function X(t) = Sin(3t). Cos . Express x(t) in Exponential Fourier Series form and calculate Fourier Coefficients Co, C1, C-1,C2, C-2 ... etc (as many Fourier Coefficients as needed). What is the fundamental frequency (wo) of the x(t)? (hint: Use Euler's formula to express Sin(.) and Cos(.) in exponential forms)
The signal x(t) 10 cos(2t (3300) t +0.2x)) is sampled at fs 8 kHz (a) Determine the sampled signal x[n]. (b) What would be the lowest possible sampling frequency for reconstructing x(0)? 4.