Question

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Using Matlab:

Generate a random signal ‘x’ with a length of 8000 and sampling rate of 8kHz. Plot a section of the signal In the time domain. Is it possible to observe significant trends in the time domain signal?

Plot the magnitude of the DFT of segments of ‘x’ of different lengths. Use a decibel scale for the vertical axis. What do you observe as the segment length increases? Use the Matlab function ‘periodogram’ to obtain a plot of a power spectral estimate of the entire signal. Compare this plot with the DFT plots. Explain any differences.

Use the Matlab function ‘pwelch’ to analyse the signal ‘x’, varying the various the optional parameters of the ‘pwelch’ function. Explain any changes.

Answer 1