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PCM1704 or newer chips?
PCM1704 or newer chips?
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Old 27th March 2009, 07:50 PM   #251
EUVL is offline EUVL  Europe
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> 1992 ...... I was young.

You are not alone.




Patrick
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Old 8th April 2009, 06:36 PM   #252
EUVL is offline EUVL  Europe
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Default Noise Measurement

In case it hasn't been posted before :

http://www.ligo.caltech.edu/docs/T/T...T060203-00.doc


Patrick
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Old 9th April 2009, 02:08 AM   #253
nagaesan is offline nagaesan  Japan
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Default OLD Machine

Hello EVIL,

Your report was written 8/18/2006. It's just these days.

Are you interested OLD Digital Recorder like this?
http://www.teddigital.com/DN023RADC.htm

My senior made this in 1972.
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Old 9th April 2009, 05:20 AM   #254
EUVL is offline EUVL  Europe
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Dear Nagaesan,

My Codename is EUVL and not Evil.
EUVL stands for something else, much less evil.
But you can call me Patrick.

That report I found through Google.
Thought someone else might be interested.
I doubt the chip has changed since.


Regards,
Patrick


PS BTW your website has so many interesting things but no one can find them from the index page.
Would you perhaps care to make a sitemap to make life easier ?
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Old 9th April 2009, 08:50 AM   #255
spzzzzkt is offline spzzzzkt  Australia
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Quote:
Originally posted by EUVL


I only want to play Redbook CD. So 44.1kHz with 11.2896MHz clock. No problem using only SD card to play. DIY crazy solution .....


another crazy DIY solution:

http://www.diyaudio.com/forums/showt...threadid=50187
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Old 9th April 2009, 02:29 PM   #256
EUVL is offline EUVL  Europe
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Been there before.

Patrick
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Old 10th April 2009, 04:00 AM   #257
spzzzzkt is offline spzzzzkt  Australia
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really?? You've tried out something along the lines described by gmarsh, or by Carl Benton in this post?

http://www.diyaudio.com/forums/showt...89#post1244889

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Old 21st June 2011, 12:50 PM   #258
tiefbassuebertr is offline tiefbassuebertr  Germany
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very interesting thread.
Comparing the PCM1704 with the other here mentioned types like AD1955, PCM1792 (= PCM1794 but SPI contr. modes) and AKM4396 isn't possible - so I think.

The PCM1704 is probably the only still available multibit DAC IC with not "indoor" digital filter and I/V conversion units (in opposite to the other mentioned types).

This means, the individual sonic performance is very dark dependent of the individual I/V circuit topology and the filter characteristic of the dig.-Filter.

For example there are various digital filters like DF1704, PMD100, PMD200 or some DSP based versions like e. g. used by Krell SBP64X or SBP32X.
The same situation is to observe by the I/U converter: From only a resistor to very complex discrete tube-, MOSFET and OP-AMP based I/V solutions are to find. By commercial products unfortunately in most cases integrated OP-Amps in use.

In previous years I ask me often, why in commercial products like cd players and DA converter devices equipped with low cost sigma delta or continue calibration DAC's the sonic performance was mostly better than such devices equipped with Burr-Brown multibit DACs like PCM63P, PCM1702 and PCM1704.
The reason may actually be only the previously described, because the highest standards by multibit converter are necessary for the I/U conversion.
About
http://www.diyaudio.com/forums/digit...rsion-dac.html
is some information to find about this.

On the other hand there must be to reach the highest sonic performance only by the still available PCM1704, if I use both for the DF unit and the IU (IV) unit ultimate solutions, because this is unfortunately not possible by all versions of one-bit or continue calibration DAC's.

I want to create a own PCM1704-DAC with the use of various I/U topologies and various digital filter units so as also an additional upsampler unit and a non oversampling (zero-oversampling) mode. A simplified schematic (block diagram) I will post here in the next time.
BTW - the old "D1" from Mr. Nelson Pass is still very hard to beat in all respects.
http://www.passlabs.com/pdfs/old%20p...uals/d1_om.pdf

Last edited by tiefbassuebertr; 21st June 2011 at 01:07 PM.
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Old 21st June 2011, 08:44 PM   #259
tritosine is offline tritosine
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you completely forgot about offline upsampling on computer,
we can manually upsample 44.1 to 88.2 , or 176.4 for use with an r2r chip & computer, its so easy to do better than nos, no need for 'DSP'.

Too much myth around upsampling really, not that interesting, also IV not interesting imho. Parallel and time interleaved DA stuff is interesting. : D

Last edited by tritosine; 21st June 2011 at 08:50 PM.
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Old 2nd December 2019, 11:47 PM   #260
tatanka is offline tatanka  Germany
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My Name is Achim, from Cologne / Germany


Sorry,



i found this older thread about PCM1704.
and i saw that you have speek about Denon DA-S1 / DP-S1


i am an owner of this two Denons.


i want to modify the DA-S1 I/V sektion with analog output


which is the best way, for audiophile music ?


Sorry, my english is not so good....



best regards
Achim
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