fjrabon
Headphoneus Supremus
- Joined
- Feb 1, 2009
- Posts
- 3,996
- Likes
- 1,119
Thank you for taking the time to answer my question. However, your answer raises new questions.
I've read about the hybrid volume control, but it's still not clear to me where the digital volume control operates. Mostly, I don't get what's so 'hybrid' about it. Let's forget the second gain stage for a while. Let's say I'll never be using that part, because I only go up to 90.5. I assume then that the 0-90.5 dB are controlled fully in the digital domain, correct?
And what do you mean by theoretically it wouldn't need dithering? Assuming a realistic maximum of 20 bits of SNR (= 120 dB), this would leave 12 bits for volume control, = 72dB. This is less than 90.5, so if there wasn't any dithering done, there would be truncation, right? Or am I missing something?
Grace gives a -190dB artifacts level from full-scale. I guess this is coming simply from 32X6 = 192? With 2dB lost somehow else?
edit: Thinking about this again, I guess this means they are using their ANSR dithering adapted to 32 bit, which would make the 190 number make sense, as in such case they're saying that the LSB dithering only throws away ~1/3 of the last bit, giving -190dBR artifacts.