How to save two sin waves with left and right channels in a stereo wav 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!

Answer 1

[Star Strider]

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);

[Omer Asif]

Worked perfectly. Thanks!

[Star Strider]

My pleasure!

[An]

When saving to a file, stereo is lost. Any way to fix this?