Record and plot \Hello world" using Matlab.
(a) Write a Matlab script that records yourself saying \Hello world" using the Matlab audiorecorder
object. Set the sampling rate to 8000 samples/sec and resolution to 16 bits. Include your script
as your answer to this item. This part was done no problem but I need help with part C
(c) On the same axes, plot the average power of your speech over a 20 msec window. You must sweep
this window over the entire duration of the signal and obtain a continuous/discrete plot of the
average power over 20 msec intervals. Include your script for calculating average power along
with your updated plot as your answer to this item. Hints: Use Matlab's hold command to plot
multiple signals on the same axes. You are asked to compute the average power of a discrete-time
signal, so you will be squaring and summing the samples contained in the signal array passed back
by the audiorecorder object. Use a loop to control the computation (average power over 20 msec)
over the entire signal. See if you can avoid a loop over each 20 msec chunk by using Matlabs colon
notation to index into the signal array.
