| 摘要 |
PROBLEM TO BE SOLVED: To improve monitoring efficiency of a monitoring system, while object environmental sound is recognized from a monitor sound with high accuracy, even in non-steady noisy environment. SOLUTION: Signals x<SB>1</SB>(t) and x<SB>2</SB>(t) for expressing the monitor sound in which sound generated from a plurality of sound sources 9a and 9b are mixed, are obtained by monitoring surrounding noise by a plurality of microphones 2a and 2b. A separation signal is generated for each of sound sources 9a and 9b by inputting the signals x<SB>1</SB>(t) and x<SB>2</SB>(t) to a signal processing circuit 3. After noise reduction in a noise reduction circuit 4, it is determined, by a sound recognition circuit 5, whether or not, the sound expressed by the separation signal for each of the sound sources 9a and 9b is the object environment sound. When it is recognized as the object environmental sound, a device control section 6 controls a camera 80, a microphone 81 and a speaker 82, on the basis of the sound source direction of the corresponding sound obtained from the signal processing circuit 3. COPYRIGHT: (C)2009,JPO&INPIT
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