Description: For the continuous time sinusoidal signal x (t) sin (2π t+), the discrete time signal x [n] x (t) sin () can be obtained by sampling the sampling frequency 1/x (t).
The x [n] is plotted with different combinations f0 and fs, which can explain the aliasing problem. Here, the sampling frequency fs 8kHZ.
(A) Draw a sampled sine wave single graph. Sine wave frequency 300Hz, 10ms interval sampling, the phase specified arbitrarily. Use stem drawing.
(B) use the plot plot.
(C) change the sine wave frequency 100Hz to 475Hz, each increase 125Hz. Drawing.
(D) change the sine wave frequency 7525Hz to 7900Hz, each increase 125Hz. Drawing.
(E) change the sine wave frequency 32100Hz to 32475Hz, each increase 125Hz. Drawing.
Discuss whether the apparent frequency is increased or decreased
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