Which parameters ore metrics can be used to differentiate two simple speach signals recorded using the following code?

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Renjith V Ravi
Renjith V Ravi 2017-9-9
编辑： Renjith V Ravi 2017-9-9
I have used the following code to record and write speech signals
clc
clear all
close all
% Record the voice password for 3.55 seconds.
record = audiorecorder;
disp('===============Speak Password============')
recordblocking(record,3.5);
disp('===============End of Recording==========');
% Play back the recording.
play(record);
% Store data in an array.
audiodata = getaudiodata(record);
% Plot the waveform.
plot(audiodata);
filename = 'key_audio.wav';
audiowrite(filename, audiodata, record.SampleRate)
how to differentiate two speech signals recorded here

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