DDC that converts I2S or SPDIF to USB

[bodiebill]

This question came up in the ECdesigns thread, triggered by a wish to be able to:

 

SDTRans384 => I2S or SPDIF => capable DDC => USB => ECdesigns USB-only DAC

 

Conversion from USB to I2S or SPDIF is quite common, but the reverse is hard to find.

 

I first thought that the Mutec MC-3+ USB would be up to the task:

https://www.mutec-net.com/product_mc-3-plus-usb.php

It does look like it as its USB connection says 'I/O', but I am a little confused as this would require a (nonexistent?) USB cable with USB B connectors at both ends.

And I was advised that it cannot output USB as master, only as slave, so the DDC could not take the place of a (master) computer with USB.

A befriended audio engineer told me that it will never be possible as USB is an asynchronous data signal and SPDIF is a synchronous signal.

Another pointed at an i2s-to-usb bridge from ComTrue:

http://www.comtrue-inc.com/index.php/products

provided it supports OTG functionality.

 

My technical knowledge is limited so I can confirm nor refute any of this. Hence my question:

Anyone here actually succeeded in doing this?

[bodiebill]

Thanks @seeteeyou, that makes sense. I thought I'd ask here just to be sure.

 

I did use 'ECdesigns USB-only DAC' as a simplification, meaning the combo U192ETL DDC + DA96ETF DAC. After all, DAC's also contain DDC circuits, and in theory both could have been combined into one device, which then we surely would have called a DAC.