how to mix two audio signals

i have two audio signals y1 ,y2 .Now i wants y3 as mixture of y1 and y2

Answer 1

[W. Owen Brimijoin]

Simple mixing is just adding.

y3 = y1 + y2;

If you want to control the level of each within the mix, then you need to adjust them as follows:

y3 = (y1*y1_level) + (y2*y2_level);

where yx_level is based on the decibel conversion:

yx_level = 10^(level/20);

So to make signal 2 half the amplitude of signal 1, you'd use -6 dB as follows:

y3 = (y1*(10^(0/20)) + (y2*(10^(-6/20));

All of this assumes that the two signals are the same dimensions and have the same starting level.

Answer 2

[suresh gunarathna]

function [Y,f]=togau(A,B)

[x1,f1]=audioread(A);

[x2,f2]=audioread(B);

[l1,c1]=size(x1);

[l2,c2]=size(x2);

if l1 > l2

l=l2;

else

l=l1;

end

if(f1>=f2)

f=f1;

else

f=f2;

end

G=zeros(1,1);

t=0;

token=0;

for i=1:l

if t==f

if token==0

token=1;

t=0;

else

token=0;

t=0;

end

end

if(token==0)

G(i)=x1(i);

t=t+1;

else

G(i)=x2(i);

t=t+1;

end

end

Y=G;

audiowrite('out.wav',Y,f);

end