MATLAB: How to increase the length of an audio file with random white noise

audioaudioreadsound

Hi, sorry if this does not make too much sense but here goes.
I have audio files, which are a second or less. I want to add random noise to the audio file (which is a wave file) at different levels of distortion too, so that the total audio length is 2.5 seconds. The level of random noise should be adjustable.
I am complete newby at Matlab and would appreciate the help.

Best Answer

Use the semicolon operator. For a mono signal
[y, Fs] = audioread('guitartune.wav');
% Crop to 1 second
y = y(1:Fs);
% soundsc(y, Fs);
% Make noise
noiseSignal = rand(length(y), 1);
% Concatenate noise.
outputSignal = [y; noiseSignal];
% Play the sound
soundsc(outputSignal, Fs);
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