2019-06-19
Copyright © 2019 XMOS Ltd, All rights reserved XM-013899-PC
VOCALFUSION DEV KIT - USER GUIDE
10
5. ALTERNATIVE HARDWARE CONFIGURATIONS
The VocalFusion Dev Kit supports two additional configurations - see Table ???. To use these configurations you will
need to flash the XVF3510 with the correct configuration file - see Section ???
5.3.1. USB/ANALOG LINE-IN CONFIGURATION
The USB/Analog Line-In configuration uses an I2S signal to input the AEC reference signal to the device, and the
USB interface for the audio output and control. You need to update to the USB Out / Analog In firmware to use this
configuration - see Section 6.2.
1. Connect the XVF3510 base board to the host PC using the supplied USB A to Micro B cable.
2. Connect the 3.5mm LINE IN socket on the XVF3510 base board to your host PC. You can also connect
powered speakers to the LINE IN socket using a splitter cable.
5.3.2. I2S SLAVE CONFIGURATION
The I2S Slave configuration uses an application processor (Raspberry Pi - not provided in kit) to run an ASR client
and wakeword software. The captured audio is streamed to the application processor using an I2S interface with
the XVF3510 acting as the I2S Slave, using an I2C interface for control functions.
Developers working with the Amazon Alexa Voice Service (AVS) must use this configuration. XMOS provides a
setup script to help install the necessary AVS SDK and software. Developers using a different voice service need
to install their own I2S Master software implementation and wakeword technology on the RPi SD card and integrate
with the XMOS firmware.
For details of using the I2S hardware and software configuration please refer to the VocalFusion Dev Kit for Amazon
AVS User Guide.
