Is non oversampling D to A conversion intellectual property?


2012-01-17 11:21 am
Dear all,

Is it possible that NOS DA conversion is owned by some one like for instance Audio Note?
Is there a patent on this?

Would this apply also to private use or is it limited to the manufacturer of the complete DA converter.

Any insights on that would be welcomed, thanks!
Regards, Veeren
Difficult to see how, since all the early digital audio stuff ran at baseband and AD and DA converters have been a thing since WW2. Any patents on the basics will have long since expired.

Now "NOS" might be a trademark of someone (Don't know, cannot be arsed to check), and there might be a patent on some modern way of doing it, but the general idea of building an inferior DAC by using really annoying precision analogue filters (That are still not all that good) instead of oversampling is going to be way out of any possible patent.

Regards, Dan.


2012-01-17 11:21 am
Thank you all!

My question answered by abraxalito and dmills.

Just received a letter from the postal service customs department that made me wonder
if they stopped my chinese nos ad1865 board for this reason.

I emailed them to find out, it could be something totally different that I have ordered.

Best regards!


2016-01-21 7:28 pm
That makes sense.

They are thorough here too so every time I receive something from Holland, everything is inspected and cut open, even the internal seals inside whatever is in the package. I assume this is after sniffer dogs and x-rays. So, no returning anything bought in Holland for me.

Difficult to see how, since all the early digital audio stuff ran at baseband...

Excellent observation, dmills.

While early Philips' CD players, I believe, utilized 14-bit converters with x4 oversampling, early Sony and other make CD players utilized 16-bit converters run directly at the 44.1kHz native sample rate of CD. Which then meant, of course, that the reconstruction filter was high order and entirely analog.