measuring the quality of mixer

Hi,
  I have implemented the Audio Mixer, which will mix three Audio Signal. I
have done implementation using MATLAB. I am getting the Mixed Signal. I
performed listening test on it. It sounds good. I want some quality
criteria to be defined to validate Mixed Output signal. Your Input will
help me.

Thanks in Advance,

Regards,
Sri Kant

srikk wrote:
> Hi,
>   I have implemented the Audio Mixer, which will mix three Audio Signal. I
> have done implementation using MATLAB. I am getting the Mixed Signal. I
> performed listening test on it. It sounds good. I want some quality
> criteria to be defined to validate Mixed Output signal. Your Input will
> help me.

As a first calibration step, put in a single sine and determine what 
frequencies come out and at what levels. Then mix three sines whose 
periods are not related by simple fractions and again examine the output 
for artifacts. The fewer and the weaker, the better.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
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