Acquisition of ultrasound, video and acoustic speech data for a silentspeech interface application

This article addresses synchronous acquisition of high-speed multimodal speech data, composed of ultrasound and optical images of the vocal tract together with the acoustic speech signal, for a silent speech interface. Built around a laptop-based portable ultrasound machine (Terason T3000) and an industrial camera, an acquisition setup is described together with its acquisition software called Ultraspeech. The system is currently able to record ultrasound images at 70 fps and optical images at 60 fps, synchronously with the acoustic signal. An interactive inter-session re-calibration mechanism which allows recording of large audiovisual speech databases in multiple acquisition sessions is also described.