Alexa Voice Service dev kit for far-field voice capture

October 06, 2017 // By Graham Prophet
XMOS (Bristol, UK) has announced its VocalFusion 4-Mic Dev Kit for Amazon Alexa Voice Service (AVS), which it positions as the first far-field linear mic array solution available. The kit is aimed at developers who want to integrate Alexa into smart panels, kitchen appliances, and other commercial and industrial electronics.

The kit features a compact four-microphone linear 100 mm array. The captured voice signals are clear even in noisy environments, enabling commands to be accurately captured from across a room for processing by the Alexa cloud-based speech recognition system. XMOS claims to have the only solution to date that places audio digital signal processing (DSP) and programmable I/O processing and control software into a single chip, enabling designers to cut their bill of materials, flexibly tailor their designs, and reduce costs.

The VocalFusion 4-Mic Dev Kit for Amazon AVS features a reference client built using the recently released AVS Device SDK. The AVS Device SDK is designed to further simplify the experience of creating Alexa-enabled products.

The design is based on the XMOS VocalFusion XVF3000, a highly integrated far-field voice processor based on the xCORE multicore architecture. The XVF3000 delivers sophisticated voice DSP capability including a full duplex acoustic echo canceller (AEC) with barge-in capability that enables users to interrupt or pause a device that’s playing music, and sophisticated noise suppression with adaptive beamforming to provide high quality voice interaction experiences even in noisy environments.

The VocalFusion 4-Mic Kit for Amazon AVS (XK-VF3000-L33-AVS) is available to developers, OEMs, and ODMs from Digi-Key at, for $499/€423.40/£372



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