Speech recognition technology combined with three dimensional lip movement

In order to improve speech recognition efficiency under background noise such as out of doors, we propose a new recognition technology combined with three dimensional lip movements. In this paper firstly, three-dimensional movements at four positions of the mouth were measured using principal component analysis to clarify which positions and which directions are main contributors to pronunciation. Secondly, recognition evaluation tests for 50 Japanese words were carried out under noise levels ranging from 40 to 80 dB. In the experiment, over 80% of recognition efficiency was measured at 70dB and improvement of 40% was obtained compared with ordinary speech recognition. From the experimental results, the proposed method can be modified to be used as practical speech recognition technology. Finally, research subjects were picked up such as an improvement in precision of measuring lip movement and experiments and data collection out of doors.