MATLAB: How to save two sin waves with left and right channels in a stereo wav file

MATLABsignal processingstereo channelswav file

Hi,
I am using audiowrite to save two sin waves. Here is my code.
fs = 8000; %frequency sample rate
i=1/fs; % interval
t = 0:i:2; % time
phi = 0;
% F = 220Hz
f = 220;
x = A*sin((2*pi*f*t) + phi);
% F = 240Hz
f = 240;
y = A*sin((2*pi*f*t) + phi);
filex   =   'x.wav';
filey   =   'y.wav';
audiowrite(filex,x,fs);
audiowrite(filey,y,fs);
Now I want to save two separate waves as left and right channels in the a stereo wav file. How can I do that.
Many Thanks!

Best Answer

To create a stereophonic sound file, you need to create a (Nx2) matrix, so each channel is a column vector. In this example, ‘x’ will be the left channel, and ‘y’ will be the right channel.
The Code —
fs = 8000; %frequency sample rate
i=1/fs; % interval
t = 0:i:2; % time
phi = 0;
A = 1;
% F = 220Hz
f = 220;
x = A*sin((2*pi*f*t) + phi);
% F = 240Hz
f = 240;
y = A*sin((2*pi*f*t) + phi);
stereo_mtx = [x(:), y(:)];
audiowrite('stereo sound.wav', stereo_mtx, fs);
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