Hi, Steve,

Accuracy is such a loaded word <smile>.

There is software that will do traditional audio tests like we used to 
do with hardware test gear...but if, as you state, A/D/A is what you 
want, you'll need another interface that will end up factored into the 
equation, or you can test it D/A/D with the software, using analog 
loopback. At least that will give you the results of the combined errors 
in both directions of the converter under test while not introducing 
limitations of the testing converter.

For quick audio measurements, I've used several pieces of software, but 
I don't do it that much these days. I think I prefer audiotester to arta.

There are some other applications that might be of interest to you.

I have not explored any of these three in depth. My new friend from AES 
Culpeper last June, Dr. Federica Bressan, used the Finnish MIR system to 
analyze audio features for degradation. I believe that this might 
involve MATLAB use, but at least some things that "need" MATLAB also run 
under the Open Source OXYGEN package.

Nadja Wallaszkovits, current president of AES, works at the Austrian 
institute that sponsors STX and she thinks it's better than MIR. By the 
way, it was Nadja who introduced me to audiotester and some other 

I don't know where I ran across Sonic Visualizer, but I think it's a 
tool looking to solve the same problems as STX and MIR.

At least Federica thinks that by using the audio features comparisons in 
MIR she was able to determine that various processes in tape restoration 
did not seem to affect the audio. I have not had time to delve into 
this, but these three applications may do more for determining 
"accuracy" than you might find in THD and IMD testing and measuring 
noise floor. For example, linearity and step accuracy of the converters 
comes to mind.

An orthogonal analysis can be done on sensitivity to clock perturbations 
and jitter which would also affect accuracy.

In other words, I don't think there is a simple answer.



On 2019-05-30 10:17 a.m., Steven Smolian wrote:
> Is there software to test the accuracy of a A/D/A concerter?  Reasonably
> priced?
> Steve Smolian

Richard L. Hess                   email: [log in to unmask]
Aurora, Ontario, Canada                             647 479 2800
Quality tape transfers -- even from hard-to-play tapes.