combine 2 audio sounds together

I have two audio files with the same length and sample rate. I would like to sum these two signals together to create a new signal: sum[n] = audio1[n] + audio2[n]*(-1)^n.

I would like to know how to implement these operations using MATLAB.

thank!

Answer 1

[Image Analyst]

The sum may exceed the range for a sound but might be ok if you use soundsc. But I'd use mean

Don't use "sum" as the name of your variable since that is a very important function that you'll no longer be able to use if you do that.

theSum = mean([audio1; audio2]);

If you want you can transform audio2 like

weights = (-1) .^ (1:n)
audio2 = audio2 .* weights;

before you do the sum