| 摘要 |
PURPOSE:To automatically detect a fact that a snowslide is generated by bringing an acoustic signal from a microphone to frequency analysis, comparing the result of his analysis with a snowslide acoustic pattern and deciding whether it is that peculiar to a anowslide or not. CONSTITUTION:A sound in the vicinity of a monitoring spot is inputted by a microphone 1, and led as an electric signal to an acoustic frequency analyzer 2. In the acoustic frequency analyzer 2, a frequency analysis is executed, and an acoustic spectrum 3 is fetched. On the other hand, in a snowslide acoustic pattern 4, a snowslide acoustic spectrum 5 is registered in advance. This snowslide acoustic spectrum 5 consists of plural pieces of data obtained by bringing representative snowslide acoustic data to frequency analysis. In an acoustic comparator 6, the acoustic spectrum 3 and the snowslide acoustic spectrum 5 are compared and when the degree of coincidence of both of them is high, it is decided to be a snowslide, and an acoustic deciding signal 7 is outputted. Also, in a tape recorder 9, timepiece data and the acoustic deciding signal 7 are recorded simultaneously. In such a manner, the generation of a snowslide is detected and recorded automatically. |
