Plot the time domain data for the recorded signal. FFT is used to convert the temporal data for the recorded sound into

[answerhappygod]

Plot the time domain data for the recorded signal. FFT is used
to convert the temporal data for the recorded sound into the
frequency domain. Cut out the coefficient of the specific frequency
whose amplitude is less than the threshold (create zero amplitude
for the specific frequency). Using the threshold values of 10, 1,
0.1, and 0.01 of the mean of amplitude in frequency data, evaluate
the data compression ratio (the data samples are not
removed/original data samples*100). Plot the frequency domain data
and threshold in one graph. Convert the reduced frequency data into
the temporal data using inverse FFT. Save the compressed sound and
listen to it.