Check out example codes for "matlab read audio". It will help you in understanding the concepts better.

Code Example 1

function play(speed, volume)
% PLAY plays an audio file
% 
% The first optional argument is speed
% 1 is normal speed, 0.5 is half speed, 2 is double speed
% 
% The second argument is volume
% 1 is normal volume, 0.5 is half volume, 2 is double volume
% 
% Both speed and volume's default values are 1
% 
% hal() is speed 1, volume 1
% 
% hal(2) is speed 2, volume 1
%
% hal(1, 2) is speed 1, volume 2

    arguments
        speed (1, 1) double = 1;
        volume (1, 1) double = 1;
    end

%This audioread function below reads the audio
[y, Fs] = audioread('audiofile.wav');
sound(y * volume, Fs * speed)
end

Learn ReactJs, React Native from akashmittal.com