Rank: Member
Groups: Member
Joined: 11/22/2010(UTC)
Posts: 7
Location: Budapest
|
Hi Russ, Brian,
I read from a lot of post that you develop a new USB to I2S module which will support 384/32. Is it true? Can you tell us something about this project? When can we buy a kit from you?
Regards,
Kristóf
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 7/9/2009(UTC)
Posts: 1
|
I am interested in this as well and whether it will be backwards compatible with my Buffalo32?
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 6/12/2008(UTC)
Posts: 79
Location: Norway
|
I think you will find your answers here: http://www.diyaudio.com/...3-tpa-usb-transport.htmlSome quotes: "It will be wired similar to our MUX/Metronome and our other receiver boards. That is because it is designed to be useful for anything that takes I2S or SPDIF. Not just Buffalo II" "My goal is to have it done by the end of November. What I mean by done, is that the module will be designed and the PCBs for prototypes will be ordered. It may take a few weeks after that for it to become widely available. It will all depend very much on how much time I have to devote to it" "I do not expect them to be shipping before Xmas" "The module itself will support 32bit (at least for I2S output as SPDIF is inherently limited to 24bit)" "In all honesty the super high sample rates are *not* my primary design goal. They are something I want but don't require. If it works solidly at 192/24 from USB I will be quite satisfied"
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 9/2/2008(UTC)
Posts: 53
Location: Sydney, Australia
|
Russ,
Any updates on how your going with the development of this module.
Thanks
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
When I have some I will post them publicly.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 3/20/2009(UTC)
Posts: 22
Location: Northern Virginia
|
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
Are you worried your computer won't be telling you the truth? ;)
Short answer is that it not a big design priority, so probably not. I am running up against the limit of available I/O on the chip.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 3/20/2009(UTC)
Posts: 22
Location: Northern Virginia
|
Given a default OS sampling rate with the promise of dynamically switching according to what the app requests (which should equal the sample rate of the src file)...it would be nice to see the actual rate out of the USB receiver match the src on disk. So yes, I am worried my computer will lie to me. 
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 12/27/2010(UTC)
Posts: 15
Location: Denmark
|
Russ, is there any improvement in sound quality in the new USB-module compared to what is currently offered? I got on the preorder list for the BII, which is supposed to be sent out in week medio febuary. I need a way to interface the BII with the laptop. Should i order the current module or wait? Edit: At the moment, i only have ripped CD's in FLAC (44.1 kHZ). I do not plan on SACD's right now. Edited by user Sunday, January 23, 2011 2:23:32 PM(UTC)
| Reason: Not specified
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 1/6/2009(UTC)
Posts: 18
Location: San Francisco
|
The current USB module have to powered by the computer but the computer's PSU may be delivering dirty power so I would like to see an external power supply option if possible.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 5/23/2010(UTC)
Posts: 708
Location: Netherlands
Thanks: 2 times
Was thanked: 48 time(s) in 45 post(s)
|
Quote:the computer's PSU may be delivering dirty power so I would like to see an external power supply option if possible. That should be easy to do with the USB header that according to Brian will get on the module. But I really doubt it's needed with this module.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 1/6/2009(UTC)
Posts: 18
Location: San Francisco
|
I think if the LCDPS could supply power to the new usb module that would be best then you wouldn't need power from the computer transport/motherboard and you could use the motherboard to send only data.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 5/23/2010(UTC)
Posts: 708
Location: Netherlands
Thanks: 2 times
Was thanked: 48 time(s) in 45 post(s)
|
Quote:could supply power to the new usb module that would be best No, it wouldn't. One has to consider the fact that Russ has mention in the past the module will be isolated, and bus powered. Providing power from the device side would also provide means to get noise into your DAC. With power from the PC side and fully isolating the signal, one really gets the best solution possible. Hence my "I doubt it's needed".
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 1/6/2009(UTC)
Posts: 18
Location: San Francisco
|
How could you isolate the signal more than not having power from the same side? If you get power elsewhere instead of power + data from the PC side but only data from the PC side wouldn't that be better? Doesn't the LCDPS have noise rejection capabilities compared to the switching power supply in your PC also?
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA
Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
|
lag0a wrote:How could you isolate the signal more than not having power from the same side? If you get power elsewhere instead of power + data from the PC side but only data from the PC side wouldn't that be better? Doesn't the LCDPS have noise rejection capabilities compared to the switching power supply in your PC also? You would need to share grounds to provide a common voltage reference. That will be the path for noise.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 6/17/2010(UTC)
Posts: 18
Location: UK
|
Hi,
The May 2011 version of the LeonVB Buffalo Integration Guid v1.0.4 on the TPA site states:
"For USB input, an USB Receiver is available. The USB receiver module offers SPDIF and I2S output. There are two versions of the USB receiver: the first generation is based on the Texas Instruments PCM2707 USB DAC chip. This version is limited to 16-bit/48-KHz signals. The latest generation is based on an XMOS controller, and allows up to 32-bit / 384KHz."
I cannot find the Xmos one on the site - is its release is *very* imminent?
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
That project is on hold for a bit until I adjust to my new job and work schedule.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 5/23/2010(UTC)
Posts: 708
Location: Netherlands
Thanks: 2 times
Was thanked: 48 time(s) in 45 post(s)
|
Sorry, when I wrote that part it was assumed to be available by christmas (2010, not 2011).
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 12/7/2011(UTC)
Posts: 474
Location: Amsterdam
Thanks: 31 times
Was thanked: 4 time(s) in 3 post(s)
|
Does anyone know the dimensions of the new module?
I want to order one in the near future but I have to take account for the space it will take.
The inside of the casing will be very crowded with my dual mono set-up with Sidecar, S/Pdif, Ventus and a starter module...
Can we assume that the new USB module will have the same measurements as the older one?
Thanks in advance,
Jordo
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 12/14/2011(UTC)
Posts: 11
Location: Washington State
Thanks: 1 times
|
Any news on the new usb module? Is it still on hold?
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
