Any new digital filters ?

percy · 14th July 2008, 06:14 PM

What other options are there besides the NPC SM5842/7 for just doing integer upsampling (4/8/16x) ?
Are there any new ones popping up or is the sm5842/7 still the only choice ?

wildmonkeysects · 15th July 2008, 02:26 AM

For DIY, small quantities: PMD-100 still takes the cake including for non-HDCD sources.

Has stood the test of time. Clean, liquid sonics. Internal registering/reclocking, separate i/o and core power and ground pins.

No worries of reverse engineered fakes: buy from someone you can return to, if it decodes HDCD, it is the real thing.

Re: your earlier post: the guys who did this one took the factors you are inquiring about into consideration. They have described it as a good set of tradeoffs when reproducing music, while still having decent steady-state specs.

Share and enjoy,

WMS

Cauhtemoc · 15th July 2008, 07:55 PM

Quote:

Originally posted by wildmonkeysects
No worries of reverse engineered fakes: buy from someone you can return to, if it decodes HDCD, it is the real thing.

Now there's a thought, cloning the PMD100...

percy · 15th July 2008, 10:30 PM

I did manage to find the datasheets for both - save them while these links work.

PMD-100

PMD-200

but alas, these are nowhere to be found. Pacific Microsonics was bought by Microsoft in 2000.

Cauhtemoc · 16th July 2008, 05:21 AM

Quote:

Originally posted by percy
I did manage to find the datasheets for both - save them while these links work.

PMD-100

PMD-200

but alas, these are nowhere to be found. Pacific Microsonics was bought by Microsoft in 2000.

I believe the PMD200 is actually still availible. All you need is a HDCD license...

kevinkr · 16th July 2008, 04:30 PM

Quote:

Originally posted by Cauhtemoc

I believe the PMD200 is actually still availible. All you need is a HDCD license...

The PMD100 is available on eBay from time to time and here as well.

flshzug · 16th July 2008, 05:03 PM

and pmd200 is a motorola dsp

Terry Demol · 17th July 2008, 09:51 AM

Quote:

Originally posted by wildmonkeysects
For DIY, small quantities: PMD-100 still takes the cake including for non-HDCD sources.

Has stood the test of time. Clean, liquid sonics. Internal registering/reclocking, separate i/o and core power and ground pins.

No worries of reverse engineered fakes: buy from someone you can return to, if it decodes HDCD, it is the real thing.

WMS

It's a pity the digital filter section of the Wolfson WM8741 dac cant
be isolated and used alone.

http://www.wolfsonmicro.com/uploads/...741_Rev1.4.pdf

It's really the first DF that offers some -real- options WRT non
half band and minimum phase responses.

WRT PMD100, what makes this filter better than say a DF1704?

cheers

Terry

percy · 17th July 2008, 01:21 PM

has anyone thought about rolling their own ?
with the advancements in microcontrollers today it might not be too difficult to diy a great integer upsampler!

irgendjemand · 17th July 2008, 10:37 PM

Quote:

Originally posted by Terry Demol
WRT PMD100, what makes this filter better than say a DF1704?

Nothing. Just for HDCD, may be... The DF 1704 is the better one. There has always been certain romanticism around here.

14th July 2008, 06:14 PM	#1
percy diyAudio Member Join Date: Apr 2004 Location: MN	Any new digital filters ? What other options are there besides the NPC SM5842/7 for just doing integer upsampling (4/8/16x) ? Are there any new ones popping up or is the sm5842/7 still the only choice ?

15th July 2008, 10:30 PM	#4
percy diyAudio Member Join Date: Apr 2004 Location: MN	Pmd-100 Pmd-200 I did manage to find the datasheets for both - save them while these links work. PMD-100 PMD-200 but alas, these are nowhere to be found. Pacific Microsonics was bought by Microsoft in 2000.

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15th July 2008, 02:26 AM	#2
wildmonkeysects diyAudio Member Join Date: Jan 2002 Location: socal, merka.	For DIY, small quantities: PMD-100 still takes the cake including for non-HDCD sources. Has stood the test of time. Clean, liquid sonics. Internal registering/reclocking, separate i/o and core power and ground pins. No worries of reverse engineered fakes: buy from someone you can return to, if it decodes HDCD, it is the real thing. Re: your earlier post: the guys who did this one took the factors you are inquiring about into consideration. They have described it as a good set of tradeoffs when reproducing music, while still having decent steady-state specs. Share and enjoy, WMS

16th July 2008, 05:03 PM	#7
flshzug Banned Join Date: Dec 2007	and pmd200 is a motorola dsp

17th July 2008, 01:21 PM	#9
percy diyAudio Member Join Date: Apr 2004 Location: MN	has anyone thought about rolling their own ? with the advancements in microcontrollers today it might not be too difficult to diy a great integer upsampler!