synthius

Hey guys,
I was wondering if anybody knows how to calculate S/N ratio of an audio amplifier. I have attached the FFT analysis of one channel at 45 watts. Is there someone out there who can tell me how to calculate the signal to noise ratio of this channel.



Thanks

Analog

answer here: http://moon.pr.erau.edu/~lyallj/ee412/sinad_exp.html

__________________
"Everything that is done in the world is done by hope." -Martin Luther
"There are two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."-Albert Einstein

synthius

I read through that page and can't really extract how to get S/N ratio from my FFT post. Could you give me some sort of equation or solve it for me. I don't' have a lot of time to waste on S/N ratio, have a presentation tomorrow.

thanks for the help though

audioguru

The max signal is +25.7dB.
The first wave of noise is at 90dB below it and many waves of noise are at 95dB below it.

So the signal to noise ratio is 95.7dB.

__________________
Uncle $crooge

synthius

audioguru, I've only been on this forum for a few days but I've noticed you are very helpful. I was hoping you would come across this post.

Thanks alot