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Old 26th September 2012, 04:58 AM   #31
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Quote:
Originally Posted by andpa View Post
... Are you planing to try it? Your opinion will be very important to me. Is it big differences of sound to the software conversion and to native PCM? ...
I will try it when the board becomes available for beta-testers.

I have listened to his first prototype connecting it to Buffalo II DAC in synchronous master clocking scheme. Upper stream transport was ElectrArt's USB Dual Audio board. I played 44.1kHz/16bit PCM sources on PC and listened hardware converted DSD256 sounds. My first impression was "Oh, it sounds as DSD256 does sound! Better than the original 44.1kHz/16bit PCM direct play!"
Then I listened DSD256 sources using ElectrArt's proprietary player software "PlayAudio". The DSD256 sources were converted from 44.1kHz/16bit PCM using SONY DSD Direct on PC. I felt the latter, software converted ones, did sound better than hardware converted ones.
Please remember that it's just a result of his first prototype that has never appeared in this thread.
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Old 5th October 2012, 06:18 PM   #32
2A3SET is offline 2A3SET  Canada
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Join Date: Dec 2003
Location: Toronto
Hi Bunpei,

By chance do you know what's the value of R1-R8 resistors?
Has anyone compared with FIR inside DSD1794?

Regards

Quote:
Originally Posted by Bunpei View Post
His first design is this;
Click the image to open in full size.

The prototype of filtering board appears at the upper left.
Click the image to open in full size.

The prototype has evolved to the full balance board shown in the previous post.

Last edited by 2A3SET; 5th October 2012 at 06:21 PM.
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Old 17th October 2012, 09:43 AM   #33
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Join Date: Oct 2012
iam not a diy expert but an enthusuasist.iam very much interested in dsd256 playback.the ElectrArt's USB DUAL AUDIO(UDA) board looks promising for the purpose.could anyone kindly explain what is needed, apart this, to play dsd256 files from my computer, finally the output being fed to my cary audio pre-amplifier .
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Old 17th October 2012, 10:50 PM   #34
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Quote:
Originally Posted by 2A3SET View Post
... By chance do you know what's the value of R1-R8 resistors?
Has anyone compared with FIR inside DSD1794? ...
I have watched his blog page for about 10 days. He has not yet disclosed R values in his 8 tap FIR circuit. He said that 8 taps are not enough
for achieving such a performance that DSD1794 has.
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Old 28th October 2012, 01:20 AM   #35
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Quote:
Originally Posted by brahmam View Post
iam not a diy expert but an enthusuasist.iam very much interested in dsd256 playback.the ElectrArt's USB DUAL AUDIO(UDA) board looks promising for the purpose.could anyone kindly explain what is needed, apart this, to play dsd256 files from my computer, finally the output being fed to my cary audio pre-amplifier .
Oh, no one gives any reply to him. Then, I will.

Within my limited knowledge, there are two DIY oriented board kit products that support DSD256 play from PC.

1. ElectrArt's USB DUAL AUDIO(UDA)
2. ExaDevices exaU2I (DSD512 is supported also)

Both kits have USB input and DSD-raw digital signal output. They provide each proprietary player program on Windows, PlayAudio for UDA and LoTech Player for exaU2I. You can't use such generic player as foobar 2000 or JRiver.
Both require USB 2.0 high speed interface.

You need to prepare your DAC device with DSD256-ready DAC module. Possible DSD256-ready DAC modules are;
A. ESS ES9018
B. TI Burr-Brown PCM/DSD 179x series DAC chip of advanced segment architecture
C. Niigata Seimitsu FN1242A
D. a simple home-brew LCR filter

If you allow a certain level of residual digital-noises, the option D is the easiest.

I hope this information may encourage you enough.
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Old 28th October 2012, 01:53 AM   #36
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Quote:
Originally Posted by Bunpei View Post
I will try it when the board becomes available for beta-testers.
ElectrArt announced an update for his PCM2DSD converter kit on his blog page (in Japanese).
ElectrArt?Digital Audio???
Click the image to open in full size.

Bunpei regards the board as his proprietary "Delta-sigma DAC" device because Bunpei could listened a high quality music by connecting a simple home-brew LCR filter to the DSD output of the board.

The board has various input;
1. two S/PDIF RCA and one S/PDIF TOSLINK optical
2. I2S via PS-Audio standard HDMI connector
3. I2S via 7 pins connector

Output;
1. DSD256 for all input [normal mode]
2. DSD256 for 44.1 & 48 kHz PCM and DSD512 for PCM of 88.1 kHz or higher
3. PCM or DSD on input without conversion. [Bypass mode]

One of two types of delta-sigma modulators can be selected.
One of two types of output filters, fast and slow can be selected.

The board can be integrated easily with his UDA board at an input side and his DSD1794A DAC board at an output side.
He confirmed DSD512 can be played without problem on DSD1794A DAC.

The kit will be released early next month if possible. He will accept orders through his web page.
The final price is not decided yet. However, he is making his efforts to keep it in the same price range of his UDA board kit.
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Old 28th October 2012, 05:14 AM   #37
Bunpei is offline Bunpei  Japan
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Join Date: Aug 2008
Default USB High speed Line Isolation using Adnaco Product

Quote:
Originally Posted by Bunpei View Post
Click the image to open in full size.
ElectrArt's USB DUAL AUDIO board includes no galvanic isolation circuits.
I have tried "SuperSpeed USB 3.0 Over Fiber Optic Expansion System" made by Adnaco, a Canadian company, to evaluate the effect of USB line isolation.
Click the image to open in full size.

My preliminary impression is the isolation brings a certain level of good effect on the quality of resulting sounds.

The system can provide a galvanic isolation of electrical grounds between external USB Audio devices and PC by achieving a digital data transfer over a pair of optical fibers of computer data communication grade.
Its primary intended use might be for factory automation or medical electronics where a long bus extension or a complete galvanic isolation is required.

The system consists three major parts.
1. Extension card for PCI Express bus in PC
2. Multi-mode optical fiber
3. Two port USB 3.0 interface unit with an external power adapter

As the two USB ports supports USB 3.0, data transfer on USB 2.0 High speed (480Mbps) was achieved without any problem and I could enjoy DSD256 or PCM 192kHz/24bit stereo plays.

This system does not expand any USB 3.0 signals on PC but expands PCI Express bus signals based on their proprietary technology in a hardware domain. Therefore, no special driver software is required for the PCI Express bus card.
Only a driver for TI USB 3.0 compatible USB interface chip built in the interface unit hooked at the end of optical fibers needs to be installed. The driver software is provided by TI.
The expansion system is completely transparent to any audio application level traffics. In other words, any software applications for audio play do not know that a pair of optical fibers are inserted in the connection.
One big limitation is that this system is not applicable to PCs of no PCI Express bus.

An audiophile grade power supply can be connected to the USB 3.0 interface unit. The actual draw is 0.5 A for +5.0 V DC.

The price of the system is almost or slightly over 400 USD including tax and shipping charge. Some people may think it's too expensive while some people may think it's worth paying. In my case, I thought it was a good product to buy.
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Old 30th October 2012, 04:01 PM   #38
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Join Date: Jan 2011
Location: Germany
Hi Bunpei,

thank you for sharing your experience with the USB-isolator! I have been looking for such a device, and I think that this isolator is what I need

I work in the medical industry (hospital), and 400 USD is cheap. I just bought a USB1 isolator with medical approval, for the pridcut I am developing, and it cost 1200 USD!


Best regards,
S

Quote:
Originally Posted by Bunpei View Post
ElectrArt's USB DUAL AUDIO board includes no galvanic isolation circuits.
I have tried "SuperSpeed USB 3.0 Over Fiber Optic Expansion System" made by Adnaco, a Canadian company, to evaluate the effect of USB line isolation.
Click the image to open in full size.

My preliminary impression is the isolation brings a certain level of good effect on the quality of resulting sounds.

The system can provide a galvanic isolation of electrical grounds between external USB Audio devices and PC by achieving a digital data transfer over a pair of optical fibers of computer data communication grade.
Its primary intended use might be for factory automation or medical electronics where a long bus extension or a complete galvanic isolation is required.

The system consists three major parts.
1. Extension card for PCI Express bus in PC
2. Multi-mode optical fiber
3. Two port USB 3.0 interface unit with an external power adapter

As the two USB ports supports USB 3.0, data transfer on USB 2.0 High speed (480Mbps) was achieved without any problem and I could enjoy DSD256 or PCM 192kHz/24bit stereo plays.

This system does not expand any USB 3.0 signals on PC but expands PCI Express bus signals based on their proprietary technology in a hardware domain. Therefore, no special driver software is required for the PCI Express bus card.
Only a driver for TI USB 3.0 compatible USB interface chip built in the interface unit hooked at the end of optical fibers needs to be installed. The driver software is provided by TI.
The expansion system is completely transparent to any audio application level traffics. In other words, any software applications for audio play do not know that a pair of optical fibers are inserted in the connection.
One big limitation is that this system is not applicable to PCs of no PCI Express bus.

An audiophile grade power supply can be connected to the USB 3.0 interface unit. The actual draw is 0.5 A for +5.0 V DC.

The price of the system is almost or slightly over 400 USD including tax and shipping charge. Some people may think it's too expensive while some people may think it's worth paying. In my case, I thought it was a good product to buy.
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Old 31st October 2012, 02:30 PM   #39
Bunpei is offline Bunpei  Japan
diyAudio Member
 
Join Date: Aug 2008
Hi, staccatiss,

I appreciate your comment very much! It's my pleasure.

By the way, an idea hit me to use this device with a notebook type PC.

Many recent notebook type PCs have an "ExpressCard/34" slot.
Here is an adapter for ExpressCard/34 to PCI Express x1.
PE4L ( PCIe Adapter ver2.1 )

This adapter might be used with the PCI Express card of the Adnaco. But I'm not sure as I have not experimented that.
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Old 2nd November 2012, 03:28 PM   #40
Bunpei is offline Bunpei  Japan
diyAudio Member
 
Join Date: Aug 2008
Quote:
Originally Posted by Bunpei View Post
I have watched his blog page for about 10 days. He has not yet disclosed R values in his 8 tap FIR circuit. He said that 8 taps are not enough
for achieving such a performance that DSD1794 has.
ElectrArt presented his final version of "DSD Principle DAC" on his blog page.
ElectrArt?Digital Audio??? ???????? 1bit delta sigma DAC (In Japanese)

Click the image to open in full size.

The dark green board at the upper right is his "DSD Principle DAC".
Its schematic is here.

He says the board has achieved a filtering performance comparable to DSD1794A.

To my regret, he has kept the R1-R8 values non-disclosure on the schematic.

He may distribute a bare board.
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