Compact disc player sonic differences by various signal procesing devices before DAC - Page 2 - diyAudio
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Old 27th December 2011, 03:48 PM   #11
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Originally Posted by studiostevus View Post
I am curious what you guys think and know of the "S.T.A.R.S." system developed by Anagram Technologies (swiss) and used as preprocessing in Audio Aero players?
The Anagram (now, Edel) technology is basically an asynchronous upsampling DSP engine. You will, no doubt, get many differing opinions regarding upsampling by way of asynchronous sample rate conversion (ASRC). While I have not heard the Anagram engine, I do have a favorable opinion of DACs I've designed and built using the AD1865 chip ASRC. The Anagram/Edel engine has better specs. than the AD1865.
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Old 27th December 2011, 03:57 PM   #12
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AD1865 is the best ASRC cip on market.
Still is vastly over-powered by a dedicated DSP with correct software and generous ammount of buffer RAM.
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Old 27th December 2011, 06:09 PM   #13
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Ad1896 i presume?
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Old 27th December 2011, 06:15 PM   #14
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Originally Posted by SoNic_real_one View Post
... dedicated DSP with correct software and generous ammount of buffer RAM.
Are you aware of any diy efforts in this direction?
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Old 27th December 2011, 09:07 PM   #15
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Originally Posted by studiostevus View Post
Ad1896 i presume?
Sorry, yes, I'd meant to write, AD1896.
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Old 27th December 2011, 09:10 PM   #16
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Originally Posted by SoNic_real_one View Post
AD1865 is the best ASRC cip on market.
Still is vastly over-powered by a dedicated DSP with correct software and generous ammount of buffer RAM.
Outperformed, yes. Vastly so, I think not. It is incorrect to compare raw compute horsepower between an application specific hardware processor and that of a generalized software compute core. You must compare outputted results for the specific task at hand. In which case, the Ad1896 performs nearly as well as a DSP based ASRC engine.

The AD1896 costs a small fraction of the Anagram/Edel solution.
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Old 27th December 2011, 09:23 PM   #17
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Originally Posted by studiostevus View Post
Are you aware of any diy efforts in this direction?
I suggest using the AD1896. It costs far less, is readily available, performs very well, and is featured in a number of DIY DAC projects in the public domain.

Should you have your heart set on creating your own DIY DAC project using the Anagram technology, it is available as a module for purchase from the linked to vendor below. Particularly interesting is the 'S2' module as I'm rather certain it features subtractive dither, although this not directly stated in the module's literature. Subtractive dither is a superior dither technology which you generally don't find utilized due to the doubling of D/A converters and other complexity which it entails.

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Last edited by Ken Newton; 27th December 2011 at 09:30 PM.
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Old 28th December 2011, 12:43 AM   #18
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Originally Posted by studiostevus View Post
Are you aware of any diy efforts in this direction?
Any enterprise that would go that direction would have to become commercial to sustain the costs.
An evaluation mainboard runs in the $500-1000 range and the actual cards with different DSP in the $250-500 range (depending of licensed software embedded).
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Old 28th December 2011, 01:57 AM   #19
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Originally Posted by SoNic_real_one View Post
Any enterprise that would go that direction would have to become commercial to sustain the costs.
An evaluation mainboard runs in the $500-1000 range and the actual cards with different DSP in the $250-500 range (depending of licensed software embedded).
Not neccessarily. TI and AD both do relatively inexpensive DSP boards. TI has one for around $100.
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Old 30th December 2011, 05:44 PM   #20
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Quote:
Originally Posted by studiostevus View Post
I am curious what you guys think and know of the "S.T.A.R.S." system developed by Anagram Technologies (swiss) and used as preprocessing in Audio Aero players?
this is a variant of upsampling:
Audioaero
ANAGRAM Technologies and StreamUnlimited BlueTiger? Connected Optical Drive Platform | Analog Devices
VELVET AUDIO - AUDIO AERO
Audio Aéro La Source - Technik - Burr-Brown 1792 DAC - Test fairaudio
Who have heard this version ?? Are there great sonic advantages in opposite to the AD1896?

here on diyaudio there are threads to those topic:
SRC4392 or AD1896
AD1896 vs SRC4192
AD1896 In slavemode how??
http://www.diyaudio.com/forums/digit...mpling-dac.htm
Why does upsampling use 192kHz instead of 176kHz?
Upsampling to 24bit 192Khz
Upsampler for Njoe Tjoeb - theory of operation
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