I wonder if Analog Devices provides an USB to I2S audio bridge? Either as one component or as a combination. It should handle USB 2, PCM 352/384 32 bit and DSD128 to PCM 176. On the other end there is a DSP (ADAU1467) running at 192/32. Audio direction is only from USB host to DSP. Since the DSP is running at 192, the bridge must be able to perform the sample rate conversion of the PCM stream down to 176/192.
I have done some searching and as far as I can see I will need to source the USB interface from other supplier but eventually there is some Analog Device solution that will be able to take care of the down sampling to match the sample rate of the DSP. Am I correct?
Bummer. Anyhow, will it support standard USB Audio Class in addition to ASIO drivers? That would make it more interesting for use with Linux or Mac hosts.
This project has, unfortunately, stretched out longer than we had hoped. We want to make sure the ASIO drivers are rock solid, and we have added a few more features. It will be a few more months yet.
Maybe. However, we have a consulting partner that will be making a slightly different version of the board available that fully supports UAC2. Please PM me for details.
The site doesn't let me send a PM.
Sorry about that.
Yes. It will support USB Audio 2.0. It will include a configuration utility for configuring the sample rate, number of channels, data and clock pin formatting, etc. The utility will store the configuration, and the board will continue operating with that formatting until the utility is run again. Since SigmaStudio is only supported on Windows, it is not unlikely that we will official support this utility on any other platform. However, officially unsupported versions may be available. Once the board is configured in the desired operating mode however, I would expect it to record and play on any platform that supports UAC2. The USBi functionality will, however, only work within SigmaStudio (and therefore only on Windows).