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Digital Drive: Re: Erroneous Stuff... by Todd Krieger Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: Re: Erroneous Stuff... posted by csown on August 22, 2003 at 21:44:29:
"You're right - if you use a brickwall-type analog post filter with an upsampler, you don't get any benefit in the area of phase distortion. However, the over/upsampler allows you to use a gentler low pass filter."True, but the "gradual filter" is only applied *after* the upsampler applies its **own** filter to the signal. (It can be either by the DAC chip running at 96 or 192 kHz, or by an external analog filter.) And the filter in the upsampler is the same brickwall filter used in the vast majority of DACs. (The digital output from the upsampler then has the "time smear" element in the signal, before the "gradual filter" is applied.) The author of the paper erroneously claims the upsampler *itself* uses a gradual filter. (Maybe if Wadia would ever make a proprietary 44-to-96 upsampler, it would implement such a filter.)
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Topic - upsampling article - solidgore 08:08:38 08/22/03 ( 47)
- Re: upsampling article - Werner 05:31:36 08/27/03 ( 0)
Erroneous Stuff... - Todd Krieger 14:23:36 08/22/03 ( 44)
- Re: Erroneous Stuff... - csown 21:44:29 08/22/03 ( 43)
- Re: Erroneous Stuff... - Todd Krieger 08/22/03 23:39:51 08/22/03 ( 42)
- Re: Erroneous Stuff... - csown 10:56:04 08/23/03 ( 40)
- Re: Erroneous Stuff... - Todd Krieger 21:24:51 08/23/03 ( 39)
- Re: Erroneous Stuff... - csown 23:37:53 08/23/03 ( 38)
- Re: Erroneous Stuff... - Todd Krieger 15:37:44 08/24/03 ( 34)
- Re: Erroneous Stuff... - csown 16:17:17 08/25/03 ( 33)
- This Wasn't as Bad as Expected... - Todd Krieger 21:31:58 08/25/03 ( 31)
- Re: This Wasn't as Bad as Expected... - csown 21:03:54 08/26/03 ( 26)
- A DAC's "Brickwall Filter" is *Not* the Analog Post Filter... - Todd Krieger 01:04:25 08/27/03 ( 14)
- PMD-100 was one with selectable dither - Wavy Davy 07:29:59 08/27/03 ( 8)
- Re: PMD-100 was one with selectable dither - Todd Krieger 09:18:47 08/27/03 ( 7)
- You can lead a horse to water ..... - Wavy Davy 19:54:26 08/27/03 ( 6)
- But Can't Make Him Drink.... - Todd Krieger 22:10:25 08/27/03 ( 5)
- Re: But Can't Make Him Drink.... - Werner 22:19:27 08/27/03 ( 4)
- High Resolution Signal versus Upsampled Signal - Todd Krieger 22:52:10 08/27/03 ( 3)
- Re: High Resolution Signal versus Upsampled Signal - Werner 23:02:15 08/27/03 ( 2)
- Think About It... - Todd Krieger 00:57:23 08/28/03 ( 1)
- Re: Think About It... - Werner 01:38:26 08/28/03 ( 0)
- Re: A DAC's "Brickwall Filter" is *Not* the Analog Post Filter... - Werner 03:58:47 08/27/03 ( 4)
- Domain Dementia... - Todd Krieger 09:10:29 08/27/03 ( 3)
- Re: Domain Dementia... - csown 10:36:24 08/27/03 ( 2)
- Re: Domain Dementia... - Todd Krieger 12:37:14 08/27/03 ( 1)
- sigh ... - Werner 22:43:03 08/27/03 ( 0)
- Re: This Wasn't as Bad as Expected... - Werner 22:27:06 08/26/03 ( 10)
- Defining upsampling. - csown 08:33:56 08/27/03 ( 9)
- Re: Defining upsampling. - Werner 22:52:31 08/27/03 ( 0)
- Re: Defining upsampling. - Ted Smith 16:07:46 08/27/03 ( 7)
- Re: Defining upsampling. - rfbrw 06:59:09 08/28/03 ( 6)
- Re: Defining upsampling. - Werner 08:20:46 08/28/03 ( 5)
- Re: Defining upsampling. - rfbrw 19:44:47 08/28/03 ( 3)
- Re: Defining upsampling. - Werner 22:36:48 08/28/03 ( 2)
- Re: Defining upsampling. - rfbrw 15:04:47 08/29/03 ( 1)
- Re: Defining upsampling. - Werner 22:34:07 09/2/03 ( 0)
- Re: Defining upsampling. - Todd Krieger 11:31:43 08/28/03 ( 0)
- Re: This Wasn't as Bad as Expected... - Werner 23:34:54 08/25/03 ( 3)
- ZOH... - csown 16:50:11 08/26/03 ( 2)
- Re: ZOH... - Werner 22:32:08 08/26/03 ( 1)
- Re: ZOH... - csown 07:43:04 08/27/03 ( 0)
- I'm Not Ignoring You... - Todd Krieger 18:33:48 08/25/03 ( 0)
Upsampling sample provided by philips 963sa - gialitt 02:25:34 08/24/03 ( 2)
- Re: Upsampling sample provided by philips 963sa - Todd Krieger 21:59:55 08/25/03 ( 1)
- Re: Upsampling Products - gialitt 08:53:05 08/26/03 ( 0)
Followed by confused stuff (nt) - rfbrw 07:22:40 08/23/03 ( 0)
Good article in general... - csown 13:23:21 08/22/03 ( 0)