TPA - USB Transport

[Russ White]

Originally Posted by ichiban

Russ,
Have you considered incorporating an ADuM4160 USB Isolator as a front end?
I've used that ahead of a Musiland USB to SP/DIF into my SABRE and
noticed an improvement in sonics.

I looked into it briefly, but since it is limited to full speed it won't work for this application. I need high speed USB 2.0 to support the sample rates I want.

I have a much better plan for isolation. But I am not going to reveal it just yet.

[ichiban]

Originally Posted by Russ White

I looked into it briefly, but .............
I have a much better plan for isolation. But I am not going to reveal it just yet.

Excellent!

[neb001]

I'm highly interested in your XMOS implementation, Russ. Looking forward to it!


If you need any beta testers, feel free to contact me

[glt]

Will it have i2c?

[Russ White]

Originally Posted by glt

Will it have i2c?

Do you want it to...?

[orpheus]

First I want to thank you for sharing your work with all of us, I enjoy listening to my Buffalo II.

I looked at the XMOS website, and have a small request that you might consider.

Would it be possible to have a female USB input on the module, instead of male, so that the USB cable can be plugged into the DAC chassis with no intermediary S/PDIF or CAT cable?

You might already be intending to design the module this way, since you are going to have i2s output, but I thought I would ask. It doesn't make sense to me that the M2Tech and other modules are designed so that the conversion to S/PDIF takes place next to the computer, and then S/PDIF carries the signal to the DAC, when the USB cable would be a better choice to run all the way to the DAC, and then have very short connections to the DAC from the module.

Thank you again for sharing your work, I would not be able to afford digital with the sound quality and flexibility (DSD!) I get with the Buffalo DAC if not for Twisted Pear Audio.

Best,
Aaron.

[glt]

Originally Posted by Russ White

Do you want it to...?

I don't know... maybe read information such as sampling rate? or select a song from the usb stick? :-)

[LeonvB]

Would it be possible to have a female USB input on the module

Actually I would prefer an off-board connector, so the user can select their prefered mounting type/method and no board would need to be replaced when the USB port is damaged. Also mounting it into a case gets much easier as you could simply drill a round hole for fi. a Neutrik USB connector.

I don't know... maybe read information such as sampling rate? or select a song from the usb stick?

I don't see the use of this: it's USB using a processor, but I doubt it'll be a full blown embedded computer board. Reading sample rate and selecting a song would require a display, user input, directory browsing capability, etc. which is easier to do with fi. an embedded PC board.

[Gluca]

+1 LeonvB

[glt]

Originally Posted by LeonvB

I don't see the use of this: it's USB using a processor, but I doubt it'll be a full blown embedded computer board. Reading sample rate and selecting a song would require a display, user input, directory browsing capability, etc. which is easier to do with fi. an embedded PC board.

A small microprocessor such as Arduino would be enough. But if you want to talk to the board, you will need i2c.

Russ said in post #8

"For now I have played signals up to 384khz directly from USB storage. But, I have not perfected this yet.

My hope is to be able to make the board work both as a host controller with USB storage and as a USB audio device. We shall see..."