|
Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
Register / Login
|
|
|
Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
Register / Login
|
In Reply to: mathematical comparison of formats posted by that's, my name on August 18, 2006 at 09:59:03:
HowdyUpsampling is just an alternative implementation of the Redbook reconstruction filter. There is no new info, nor (in a purely mathematical sense) a smoother result. Now the fact that there is a lot more freedom in filter selections available after upsampling gives a lot of room for optimizing, say, amplitude response or frequency response, etc. but there is no other mathematical superiority of upsampling.
Also spline interpolation is not the proper method of filtering after upsampling. (I'm not saying that a few companies don't do it, but it's not the standard way and most upsampling chips certainly don't do it.)
You are also wrong about upsampling Redbook being superior to SACD from a mathematical point of view. SACD has four times the bit rate of Redbook. Upsampling adds no new info to Redbook so upsampled Redbook is still at an approximate four to one disadvantage in info compared to SACD.
I agree that higher sample rates are (in general) a good thing. The problem you are ignoring is that it's impossible to implement a technically correct PCM reconstruction filter so everyone picks a different compromise, some better to some, some worse to others. I happen to like SACD's approach of avoiding the problem.
-Ted
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Not quite - Ted Smith 14:01:49 08/18/06 (2)
- You answer before you read? - that's, my name 01:27:04 08/21/06 (1)
- Sorry, I read that paragraph backwards. [nt] - Ted Smith 08:04:48 08/21/06 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
