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Old 14th July 2008, 06:14 PM   #1
percy is offline percy  United States
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Default 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 ?
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Old 15th July 2008, 02:26 AM   #2
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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
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Old 15th July 2008, 07:55 PM   #3
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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...
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Old 15th July 2008, 10:30 PM   #4
percy is offline percy  United States
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Default 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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Old 16th July 2008, 05:21 AM   #5
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Default Re: Pmd-100 Pmd-200

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...
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Old 16th July 2008, 04:30 PM   #6
kevinkr is offline kevinkr  United States
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Default Re: Re: Pmd-100 Pmd-200

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.
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Old 16th July 2008, 05:03 PM   #7
flshzug is offline flshzug  Antarctica
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and pmd200 is a motorola dsp
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Old 17th July 2008, 09:51 AM   #8
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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
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Old 17th July 2008, 01:21 PM   #9
percy is offline percy  United States
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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!
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Old 17th July 2008, 10:37 PM   #10
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Default PMD 100 ???

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.
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