MATLAB has function audiorecorder ready to use :

Fs = 44100;                      % [Hz] sampling freq
nBits = 16; 
nChannels = 2; 
ID = -1;                                                               % default audio input device 
recObj = audiorecorder(Fs,nBits,nChannels,ID);

disp("start recording")

recDuration = 15;                                                 % record for 15 seconds
recordblocking(recObj,recDuration);
disp("stop recording")

play(recObj);

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