Question: Record an audio using any device $($cell phone, microphone, podcast etc$)$ and save as a $".$wav" file. It could be simple talking or singing by you or some other person $($I don't need the identity of the person$).$ Make sure that there is variation in loudness. Then use Matlab programming to do some processing. Submit the codes along with any graphs, results and audio files.

$(15$ points$)$ Find the information about the audio file.

a$.$ Sampling frequency

b$.$ Time duration

c$.$ Number of channels

d$.$ Bits per sample

e$.$ Size of the file

f$.$ Compression status

g$.$ maximum value

h$.$ minimum value

i$.$ length of the audio data

$(15$ points$)$ Draw the graph of a small segment of the audio $($say $0\mathrm{.}1sec).$ Mention the time of start and time of end.

$(20$ points$)$ Create a new audio by reducing the sampling frequency to $70\%.$ Explain the result in the audio output.

$(20$ points$)$ Create a new audio with linear amplification of $400\%.$ Explain the result in the audio output.

$(30$ points$)$ Using the mean value as the threshold, do the following processing. Explain the result in the audio output in each case.

a$.$ Downward compression by $60\%$ and upward compression by $200\%$

b$.$ Normalization