Audio signal characteristics information

I wanted to analyse the audio signal, it's amplitude, frequency, etc. using matlab.

What's data stored by 'getaudiodata' ,I understand that the audio signal gets quantified in magnitude and time. I appreciate all comments.

% Record audio signal for 5 seconds.
recObj = audiorecorder;
disp('Start speaking.')
recordblocking(recObj, 5);
disp('End of Recording.');

% Play back the recording.
play(recObj);

% Store data in double-precision array.
recordedSig = getaudiodata(recObj)

% Plot the waveform.
plot(recordedSig);