USB Output Module Up and Running

Multi-channel HDMI digital audio extractor with advanced signal processing
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AP
Posts: 366
Joined: Wed Jan 04, 2012 8:34 pm

USB Output Module Up and Running

Post by AP »

Hi all,
Some exciting news on the USB Output Module option! The board is up and running and one can get up to 8 channels from the HDMI interface via USB into a PC with the internal processing of the Vanity[sup]PRO[/sup] still engaged. Another useful feature is the asynchronous resampling to a fixed sampling rate. This module basically turns the Vanity[sup]PRO[/sup] into a multichannel HDMI Audio to USB Audio converter with:
  • Option to fix the sampling rate - from the PC.
  • Option to bypass ASRC for compressed multichannel formats or bit-accurate audio.
  • External master-clock synchronisation.
  • Monitoring stereo S/PDIF output from either HDMI or USB side.
  • S/PDIF Input for added flexibility.
Who is this module for? Anyone who runs any kind of live (room) processing on a PC, uses a PC as the primary audio source/input switching device or needs to get 8-channel audio from HDMI to a PC for editing, etc.

The architecture of the module and functionality detail can be seen in the block diagram below.
[url=http://audiopraise.com/img/VPRO_USB_Block_diagram.PNG][img]http://audiopraise.com/img/VPRO_USB_Block_diagram_small.png[/img][/url]

Here is a photo of the Vanity[sup]PRO[/sup] internals with the USB Output Module running.
[url=http://audiopraise.com/img/VPRO_USB_board_running.jpg][img]http://audiopraise.com/img/VPRO_USB_board_running_small.jpg[/img][/url]

And finally, here are two screenshots of an audio analyser software running on a PC with 8 channel metering. The first one is playback of 8-channel DVD-A at 96kHz through the Vanity[sup]PRO[/sup] and resampled to 192kHz by the USB Output Module. The audio meters screen from the Vanity[sup]PRO[/sup] pasted into the screenshot for reference.
[url=http://audiopraise.com/img/VPRO_USB_8ch_96kHz_to_192kHz.png][img]http://audiopraise.com/img/VPRO_USB_8ch_96kHz_to_192kHz_small.png[/img][/url]

The second screenshot is SACD playback with 1kHz tone in all 6 channels, originally converted to 176.4kHz by the Vanity[sup]PRO[/sup] and then resampled to 192kHz by the USB Output Module. The audio meters screen from the Vanity[sup]PRO[/sup] pasted into the screenshot for reference.
[url=http://audiopraise.com/img/VPRO_USB_6ch_SACD_to_192kHz.png][img]http://audiopraise.com/img/VPRO_USB_6ch_SACD_to_192kHz_small.png[/img][/url]

We plan to finalize the USB Audio side of the firmware over the Christmas break and make the board available for sale in January/February 2023 together with the Vanity[sup]PRO[/sup] firmware V5, which will support the extra features of the USB Output Module.
Please feel free to comment or ask any questions below.
Best Regards,
Pavel
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