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-   -   noise floor analyser (http://www.diyaudio.com/forums/vendors-bazaar/196821-noise-floor-analyser.html)

vincent_brient 18th September 2011 11:15 AM

noise floor analyser
 
Hello,
I made an audio analyser specifically to measure a DAC noise floor. It can measure a noise floor downto -165dBFs. Is is used like a sound card and the FFT is done is a computer.

totaldac analyser

http://www.totaldac.com/fichiers/ana...oise_floor.gif

http://www.totaldac.com/fichiers/upl.gif

wintermute 18th September 2011 10:00 PM

I've tried the link but it times out for me, so can't make a judgement on it.

Tony.

vincent_brient 18th September 2011 10:07 PM

Quote:

Originally Posted by wintermute (Post 2715441)
I've tried the link but it times out for me, so can't make a judgement on it.

Tony.

I don't understand, it should work well:
Totaldac noise analyser

kevinkr 18th September 2011 10:27 PM

Quote:

Originally Posted by wintermute (Post 2715441)
I've tried the link but it times out for me, so can't make a judgement on it.

Tony.

Link in first post seems to work OK for me.. :D

In real terms the noise floor shown IMHO is exceptionally low, wondering how that was accomplished.

kevinkr 18th September 2011 10:39 PM

:cop: This is essentially an advertisement for what is an interesting product, nonetheless it belongs in the commercial forums. Hence its move to vendors bazaar.

vincent_brient 19th September 2011 08:47 AM

Quote:

Originally Posted by kevinkr (Post 2715496)
:cop: This is essentially an advertisement for what is an interesting product, nonetheless it belongs in the commercial forums. Hence its move to vendors bazaar.

Sorry for having chosen the wrong category.

vincent_brient 19th September 2011 08:57 AM

Quote:

Originally Posted by kevinkr (Post 2715479)
wondering how that was accomplished.

The efforts where done mainly on the analog front end amplifier, multiple galvanic isolation to get the same result even when the equipment under test is connected to earth, in the ground/earth routing and in the power supply noise.

Yes it has become a commercial product, but for DIYers it can be an alternative to expensive high end audio analysers.
For DIYers high level measurements can be done by a sound card but very low noise measurement can't be done properly by a conventional sound card.


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