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Multimodal surveillance systems using visible/IR cameras and other sensors are widely deployed today for security purpose, particularly when subjects are at a large distance. However, audio information as an important data source has not been well explored. One of the reasons is because audio detection using microphones needs installation close to the subjects in monitoring. In this paper, we investigate a novel "optical" sensor, called Laser Doppler Vibrometer (LDV), for capturing voicedoi:10.1109/icme.2006.262864 dblp:conf/icmcs/LiZW06 fatcat:hnqb5h6f7vbg3geuuheffc4lai