I'm having some trouble getting a clear idea of what it really is. The datasheet tells me 55.2KHz but I seem to recall people using the PMD100 on projects involving higher sample rates. I may be mistaken, though, but I apparently lack the requisite search skills to definitively answer the question myself, so I'm asking here
Thanks for any help!
Thanks for any help!
The input sample rate would be 44.1 or 48 kHz. 55.x k is the fastest the chip will still meet specs, a bit of margin typical when writing chip specs.
The output sample rate in HW/standalone mode is 8x that, 352.8 or 384 kHz. Maybe what you were referring to...?
Regardless of specs, it is a very good sounding filter, including when playing non-HDCD material.
Enjoy,
WMS
The output sample rate in HW/standalone mode is 8x that, 352.8 or 384 kHz. Maybe what you were referring to...?
Regardless of specs, it is a very good sounding filter, including when playing non-HDCD material.
Enjoy,
WMS
Okay. Thanks for the info! It was just unclear to me what the max input was; for some reason I'd read it could take 96KHz, but I guess not. I was aware that the output was of course higher due to oversampling.
My DAC (Assemblage DAC-2.6) currently has the PMD100 in it. Seems like a great filter, overall, and the gains from HDCD appear to be significant (I used my computer to be able to block/unblock HDCD to check it, and conveniently this unit's design allows me to disable attenuation).
There is apparently a DF1704 filter available, though, for 96KHz operation. I don't know if it's worth pursuing or not.
My DAC (Assemblage DAC-2.6) currently has the PMD100 in it. Seems like a great filter, overall, and the gains from HDCD appear to be significant (I used my computer to be able to block/unblock HDCD to check it, and conveniently this unit's design allows me to disable attenuation).
There is apparently a DF1704 filter available, though, for 96KHz operation. I don't know if it's worth pursuing or not.
rossl said:I would like to design a board that would be a stand-alone HDCD decoder.
Does anyone know of a source of PMD100s or PMD200s?
Preferably not from China. I recently saw an ad for some from China, but it seemed suspicious. They were probably counterfeit.
Your best bet might be to consider buying a used CD player or DAC with the chip. It's a DIP package and rather straight forward to unsolder and reuse.
THe chip has been out of production for quite a while after Microsoft bought the company and IP.
I have several HDCD disc's and an Adcom GDA750 Balanced DAC that supports HDCD. The sound from the HDCD disc's is nothing short of awesome. Even my non-audiophile friends readily prefer the HDCD version of Yes's 90125 to the remastered release.
Sad HDCD never really caught on and moved forward.
-David
dw8083 said:
Your best bet might be to consider buying a used CD player or DAC with the chip. It's a DIP package and rather straight forward to unsolder and reuse.
Yes, I have one. It's an Parasound from the 90's. It's hardly worth it to design a PCB just for one chip. It will need a micro to control the PMD chip and a CPLD to reformat the output into I2S.
What I really want is 10 or 20 PMD chips so I can build a lot of them.
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