Create a $.$wav file of your own voice by reading and recording the letters A$,$ B$,$ C and D$.$

$($You may use the application $$audacity$$ for this purpose$).$

$1.$ Read the file from matlab.

$2.$ Find out the size of the matrix. Plot the $.$wave file.

$3.$ Find out the length of recording from the plot.

$4.$ Play the sound file from Matlab

$5.$ Work on the matrix so that the letters B and D will be audible on one track only while

playing.

$6.$ Work again on the matrix so that the letters B and D are eliminated completely from the

wave file.