Sound pattern - Onmon

Japanese: 音紋 - おんもん
Sound pattern - Onmon

...For this purpose, the sound is subjected to narrowband frequency analysis and the results are plotted on a recording paper. This is usually called a sound print, and the characteristics of this sound print are identified by pattern recognition to classify targets. For this purpose, it is necessary to collect and classify the sailing sounds of many ships in advance.

*Some of the terminology explanations that refer to "sound patterns" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このためには音を狭帯域周波数分析し,その結果を記録紙の上に描き出す。これを通常,音紋と呼び,パターン認識によりこの音紋の特徴をとらえ目標類別を行う。このためにはあらかじめ多くの艦船の航走音を集収分類しておく必要がある。…

※「音紋」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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