[GreenBow]

I have been assured now that the Chord Mojo USB is asynchronous.
Post 3731: http://www.head-fi.org/t/784602/chord-mojo-the-official-thread/3720#post_12048849
Post 3730: http://www.head-fi.org/t/784602/chord-mojo-the-official-thread/3495#post_12044746
This second thread seems to explain that the chip clocks the music even on the SPDIF.
 
 
I am wondering about jitter. The reason why is because on the Chord Hugo, only one of the USB inputs is asynchronously clocked by the Hugo. That being the USB HD input. The SD USB input on the Hugo I don't know if it is asynchronous.
http://chordelectronics.co.uk/files/Hugo%20manual%20(1).pdf
There is no mention of asynchronous clocking in the Mojo manual.
http://www.chordelectronics.co.uk/mojo/manual/Mojo-User-Manual.pdf
However going by the Hugo example of the Mojo being HD input, I suppose it's asynchronous.
 
 
I am baffled why the SD input on the Hugo is not marked in any way as asynchronous. Plus why they don't make a point of highlighting that the
 
Very puzzling because we are told that to reduce jitter, to bypass the clocks on eg our PCs, tablets etc. Whereas I think many of us will be playing WAV and FLAC files from our computers. Therefor it would make sense that the SD USB input were asynchronous.
Mojo is asynchronous. If it isn't asynchronous then maybe it's really aimed at use with DAPs that clock well.
 
 
The Rob Watts explanation I suppose covers it, because we normally consider optical as synchronous. It's just that it stood out to me what Chord say about the Hugo. That the HD USB input uses the high quality clock chip in the Hugo.
 
It stands to reason to me that all Chord DAC USB inputs would be asynchronous. Although this thread is asking about the specification of the USB input of the Mojo. However please feel free to discuss the Hugo SD USB SD-input because I am equally puzzled about that.

 

[GreenBow]

I re-read and re-read this link. post #3501  http://www.head-fi.org/t/784602/chord-mojo-the-official-thread-read-the-first-post-for-updated-info/3495#post_12044746
 
It seems to suggest to me that the Mojo re-clocks the signal even on the SPDIF input. Which is amazing I have to say. I have come across the term isochronous, and wonder if that is what is happening on the SPDIF. It would also possibly explain what is happening on the SD input of the Hugo.

 

[lokyc]

Just randomly came across this old thread. If the answer hasn't already been found, asynchronous USB is only supported in USB Audio 2.0. (also includes HD and multichannel audio). This standard is supported natively by the latter Linux but not Windows. Hence the need for an audio driver in Windows.
 
The SD USB input confirms to USBA 1.0 which is driverless across all devices but is much more primitive.