|
Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
|
|
|
Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
|
In Reply to: More on "self dithering" and actual noise levels in recordings posted by Christine Tham on March 2, 2007 at 15:46:57:
Assuming that we set the levels such that peak is close to 0dBFS, then typical noise level in a recording: around -70-80dB.You can actually validate this yourself by doing an analysis of commercial recordings. The majority of them will exhibit ambient noise levels at these levels.
These levels are clearly too high to produce a self-dithering effect when truncating from 24 to 20.
The noise level does not have to be near the quantization noise floor. It only has to be _above_ the quantization noise floor. Dither levels are deliberately set near the quantization noise floor so the dither doesn't reduce S/N too much.
Particularly when you analyze the spectrum of the ambient noise and realize it is not random.It doesn't have to be random. It merely has to be uncorrelated with the musical signal and above the quantization noise floor in level from 0 to fs/2.
Dave
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: More on "self dithering" and actual noise levels in recordings - Dave Kingsland 17:05:52 03/03/07 (1)
- Re: More on "self dithering" and actual noise levels in recordings - Christine Tham 02:29:52 03/04/07 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
