[Editor's Note: We're reproducing and sharing this document in its entirety and AudioStream would like to thank Andreas Koch, Andy McHarg and Rob Robinson for their efforts in defining an open standard for DSD over USB]
USB Link for DSD Audio via PCM Frames
Presented by Andreas Koch (Playback Designs), Andy McHarg (dCS), and Rob Robinson (Channel D)
The USB Audio specification 2.0 defines multiple formats for audio of which standard PCM is only one. A general “raw data” format was also defined that can be used for any kind of data including audio, but unfortunately, no specific format was defined for DSD and with the ongoing proliferation of USB converters in the current market it appears that the opportunity for the official USB specification to adopt a single common method of transferring DSD audio via USB is slowly disappearing. This is an attempt of uniting as many manufacturers as possible and jointly defining a method for transferring DSD via USB.