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A visual microphone has been proposed to capture the distant sound. This microphone captures the sound from high frame-rate video by using the pixel difference. It is expected to be applied in surveillance cameras because it is robust to be affected by the sound distance. However, this capturing method is unpractical due to expensive-equipment requirement. In this paper, we attempt to realize inexpensive visual microphones by using a still camera with a CMOS image sensor. A CMOS image sensordoi:10.18154/rwth-conv-239504 fatcat:fln4ktq27jg7vj7mumphqlx2lq