VocalFusion Stereo Dev Kit Quick Start Guide
6
Useful Information
6.1
Speaker Selection
The choice of stereo speakers used in your evaluation is important and can greatly
affect overall system performance.
·
The amplifier in the speakers should have linear gain. Non-linear gain (e.g. soft
clipping) should be disabled or avoided.
·
Any audio processing available on the speakers should be disabled.
·
For low quality speakers it is best to use low volume settings to avoid non-linear
distortions of the reference signal.
The Logitech Z130 stereo speakers, for example, work well for evaluating the
VocalFusion Stereo Dev Kit.
6.2
Windows audio drivers
Windows includes a USB Audio Class 1 (UAC1) driver and so natively supports the
VocalFusion Stereo Dev Kit.
When a configured dev kit is connected to a Windows PC, the native UAC1 driver is
installed and the device details are stored in Windows’ USB cache. If subsequently
a different version of the dev kit is connected (for example, a dev kit with a
firmware using the same VID and PID but exposing a different configuration of
audio channels) then the Windows’ USB cache is not updated and the USB audio
connection to the dev kit will not operate correctly.
If this occurs, disconnect the dev kit and use the
USBDeview
utility (freeware avail-
able from
http://www.nirsoft.net/utils/usb_devices_view.html
) to uninstall all
instances of XMOS USB audio devices. Then re-connect the dev kit; fresh instances
of the UAC1 driver will then be correctly installed.
7
Troubleshooting
This section will guide you through reloading the XVF3500 firmware.
1. Install the XMOS xTIMEcomposer tools on the host PC. These are freely available
from:
·
2. Download the latest XVF3500 firmware binaries from:
·
https://www.xmos.com/support/software/vocalfusion
A MyXMOS account is required to complete this step.
3. Connect the dev kit to the host PC, using the supplied USB A to Micro B cable.
4. Connect the xTAG debug adaptor to the host PC.
XM012531A
