09-21-2020, 05:15 PM
(09-21-2020, 02:52 PM)Tim Curtis Wrote: I'm not sure what you mean by a DAC's "native rate". DAC's have a specific range of rates up to a max rate that they support.
You would need to look at the DAC's data sheet to see whether it offers an automatic, rate based filter bypass as is offered in the PCM5XXX chips. If not then its internal oversampling FIR filter will always be active.
What's the chip? I'll pull down the data sheet and see what it offers.
Resampling theory also posits that additional resampling done internally by the dac isn’t as critical (of course, but imagine upsampling an image from 100x100 to 1000x1000, if you use a very good method to go from 100x100 to 500x500 first then a simple one to go from 500x500 to 1000x1000 it’ll look better than if you just did the simple method all the way from 100x100). Here’s a good article that talks resampling with links to a few more prior on the subject.
http://archimago.blogspot.com/2018/11/musings-raspberry-pi-3-b-touch.html
Like with all audio questions you should listen to it and see if you think it sounds better or not.
