Matlab uses audiorecorder and recordblocking to record sound, play to play sound, and audiobook to save sound

Because I use now matlab yes 2018a, So you can't use abandoned wavreord and wavplay, Only use audiorecorder.

Fs=44800;% Microphone sampling rate 
nBits=16;% Quantization Bits 
nChannel=1;% Number of recording channels , You can set 1 perhaps 2
time=5;% Time of recording audio , The unit is seconds 
recObj = audiorecorder(Fs, nBits, nChannel);

disp('Start speaking.')
% Start recording sound 
recordblocking(recObj, time);
disp('End of Recording.');

%  Playback recorded data 
play(recObj);

%  Get recording data 
myRecording = getaudiodata(recObj);

%  Draw recording data waveform 
plot(myRecording);

% Store voice signals 
filename = 'audiorecorder_data_1.wav'; 
audiowrite(filename, myRecording, Fs);

You can see that the size of the file generated by the recording is 438KB
It's calculated by ：Fs * nBits / 8 * time * nChannel / 1024
namely ：44800 * 16 / 8 * 5 * 1 / 1024 = 437.5KB
No matter how many words you say when recording , Even if you don't say a word , The size of the generated files is so large .