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 Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

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abraxalito
diyAudio Member

Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Thanks for putting up the link to those measurements because it illustrates the graph I was referring to earlier. Here's the relevant section of the THD+N vs level plot. The top of the window shown is 0.01% or -80dB for this figure, vertical scale 5dB and across the screen heading to the right is the level increasing:
Attached Images
 ESS-80dB.png (2.0 KB, 129 views)
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TheShaman
diyAudio Member

Join Date: Jan 2007
Yeap.

Quote:
 Same with THD vs level, there you can add the input level (horizontal axiss) and the measured THD+N to get the THD+N relative to full scale. As an example at -60dBFS the THD+N is -70dB, so the THD+N relative full scale is -130dB.
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Charles
diyAudio Member

Join Date: Mar 2002
Location: Germany
Quote:
 Originally Posted by Julf So at what sample rate does his DAC actually run?
Hi Julf,

the DAC inside the Tera-Player runs on the native sample-rate of the wav file.

Supported sample-rates are 44.1/48/88.2/96/176.4 and 192 kHz.

The DAC could run up to 384 kHz, however then I would need a twice as fast ARM chip, which would be much bigger and would need more power. Therefore I have limited the max sample-rate to 192kHz, I wanted the Tera-Player to be small and have a long playtime, and there is not much 384kHz material available anyway.

Two separate oscillators with a max. RMS phase jitter of 1ps (acc. to data-sheet, I cannot measure such a low jitter) are employed for the timing.
One for 44.1 /88.2 /176.4 kHz.
and the other for 48/96/192 kHz.

The on-the-fly switching of the oscillators is quite tricky, and I am very happy that I was able to make it work, LOL

Charles

fas42
Banned

Join Date: Jun 2012
Location: NSW, Australia
Quote:
 Originally Posted by erin Hi Frank, I agree with most of what you say, but, I have noticed this phenomenon when listening to Meridian CD players ( of S-D ilk) as well as Rega's newest DAC, and even other peculiarities of a similar nature when listening to the ES9018 in the Wyred4Sound DAC. I, perhaps incorrectly, have assumed that the above companies would be using a good implementation of this technology. Which company do you know of, has a good implementation of S-D technology? I wonder if you have had any experience with Burr Brown R2R, or TDA1541 done well?
Erin, I would be loath to recommend a particular company, or item, because in my experience it's more complicated than that. I come from the angle of whole system engineering, looking at an audio setup as being a single component, or circuit, starting from where the mains power is hooked into at the wall, right up to where the speaker driver is being driven. The fact that this typically is all separated into individual boxes just makes the whole business of getting a system to work right very messy, and introduces a high percentage of the problems, to boot.

So a particular DAC may be brilliant, or barely tolerable, for a whole range of issues, many of which really need to addressed by fiddling with the other boxes - the best way - or trying variations of the other boxes.

That said, I, like many others, would go for reasonably priced units that have got good reports by a wide variety of users as a starting point.

I have had good experiences with Burr Brown R2R, in older Yamaha gear ...

Frank

Julf
diyAudio Member

Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Hi, Charles,

Quote:
 Originally Posted by Charles the DAC inside the Tera-Player runs on the native sample-rate of the wav file.
Thank you for that clarification!

 1st December 2012, 01:14 PM #206 Charles   diyAudio Member   Join Date: Mar 2002 Location: Germany Hi Julf, I just see your location is Amsterdam, this is where the Philips headquarters are. Do you work for Philips ? Just curious, Charles
Julf
diyAudio Member

Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Hi, Charles,

Quote:
 Originally Posted by Charles I just see your location is Amsterdam, this is where the Philips headquarters are.
Indeed, and while I can't see the Philips head office building from my window, I just need to go around the corner to see it.

Quote:
 Do you work for Philips?
No, I don't - and not many people do here in Amsterdam. Most of the Dutch R&D is in Eindhoven (where Philips originally started out from), but almost all real operational and manufacturing activities are outside the Netherlands these days.

[and to abraxalito - sorry for lingering on in your blogthread, but I wanted to reply to the direct question from Charles]

 1st December 2012, 02:04 PM #208 SY   On Hiatus     Join Date: Oct 2002 Location: Chicagoland OT noise removed. Stick to technical discussion. __________________ "You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
TNT
diyAudio Member

Join Date: Apr 2003
Location: Sweden
Quote:
 Originally Posted by fas42 .... I come from the angle of whole system engineering, looking at an audio setup as being a single component, or circuit, starting from where the mains power is hooked into at the wall, right up to where the speaker driver is being driven. ... ... Frank
abraxalito, You should hire Frank! :-)

PHEONIX
diyAudio Member

Join Date: Jul 2004
Location: Australia
Quote:
 Originally Posted by abraxalito How do you know the proportion of music that's recorded by SD? Your question sounds like this question - all light in my room shines through a dirty window, what can a second clean window after that do that a second dirty one won't?
Hello Richard,

The worlds most used music production software is Pro Tools, its hardware would definitely be using SD A/D, as most everybody else does.

Could you please give an example of a Company which manufactures a non SD A/D converter which is used in professional audio products which is used for audio capturing for recording purposes in studios, which is current production.

Last edited by PHEONIX; 2nd December 2012 at 06:08 AM.

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