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Old 20th March 2005, 06:57 PM   #1
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Default Best Digital Filter Chips and Info?

Hello to All:

I want to ask (take a mini poll) as to what people think
are the best digital filter chips that have been on the
market in terms of sound quality. They could be either
current or past production.

Also, does anyone know of web sites that discuss things
like digital filter impulse response and associated issues?

Thanks to all in advance!

fastcat
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Old 20th March 2005, 08:12 PM   #2
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SM5842 and SM5843 are OK when you want the OS route. Funny but I recently read this about it :

http://www.dagogo.com/47LabFlatfishP...ommentary.html
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Old 20th March 2005, 10:26 PM   #3
JohnW is offline JohnW  Hong Kong
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Fastcat,

No Question, the Pacific Microsonics PMD100 / PMD 200 HDCD filters - IMO nothing comes even close... other filters give digital filters a bad name.

Besides these - next best would be the YSF210 Yamaha 22bit.

The NPC filters (as badged by Burr Brown / TI) always seem to lean on the side of being bass-heavy & poor sound staging compared to the neutral sounding Yamaha’s and HDCD filters.

John
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Old 20th March 2005, 11:10 PM   #4
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Quote:
Originally posted by JohnW
No Question, the Pacific Microsonics PMD100 / PMD 200 HDCD filters - IMO nothing comes even close... other filters give digital filters a bad name.
Would there be some means by which mere DIY mortals might acquire these?
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Old 20th March 2005, 11:10 PM   #5
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JohnW:

A bit amazing that the PMD100 & 200 are still the
best sounding digital filter chips. I would have
thought that some manufacturer ( TI, AD, NPC,
etc.) might have come up with something better
at handling the digital filtering. I guess that Keith
Johnson & company (Pacific Microsonics) were
just that much better (or ahead) of the crowd.

Fastcat
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Old 21st March 2005, 12:51 AM   #6
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'Vintage' YM3623B was good chip as well...

Nick
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Old 21st March 2005, 05:53 AM   #7
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YM3623B is a digital receiver ( DIR ) like Crystal CS8412 etc.

BTW the PMD100 is nothing but neutral IMO on non-HDCD recordings which made me choose other filters at that time. Fastcat, if you include combined digital filter+DAC chips there are other candidates as well.
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Old 21st March 2005, 08:41 AM   #8
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In a lot of cases, modern DAC's have built in digital filters eg AD1955 and PCM1792, and many others. Some allow the internal digial filter to be bypassed, so you have to hook up an external one. The question is, how do the internal filters compare to the external ones. One would hope the the internal filters are customized / optimized for the DAC they are part of.

Adrian
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Old 6th February 2009, 09:02 PM   #9
percy is offline percy  United States
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I know I am reviving a very old thread but I was searching about the same subject so I thought I'd just bump this up.

The SM5842/7 and PMD100/200 seem to be the only decent digital filters that have ever been around. Arn't there really no new digital filters that are as good, if not better, than these filters ?
Digital filters have always appealed to me over 'Sample Rate Conversion' for oversampling 44.1Khz because of the integer oversampling ratio and also a higher ratio(8x) than typical ASRC(192khz).


Are there any modern DSP processors or solutions that could be substituted for these filters ?

I am also not opposed to the idea of doing a pic based diy filter.
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Old 6th February 2009, 09:13 PM   #10
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I strongly believe that this one is the best digital filter currently available:

Click the image to open in full size.

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