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サビを抽出する機能

音楽の「サビ」を探し出す試聴機 [Nature BioNews]

スマートミュージックキオスクは、曲をC、C#、D、・・・、Bの12のピッチ(音の高さ)に分解する。それから、各ピッチのパワー(強さ)を足し合わせる。つまり、高いBと低いBのパワーは足し合わされる。そして、これらの12 のピッチのパワーが1曲の間に時間とともにどのように変化するかを分析する。
曲の中からさびに当たる部分を「パワー」というパラメータを使って予測し、繰り返しなどを考えてさらにそこからよりサビらしい部分を取り出すエンジンが開発されています。 4分の曲を解析するのに1分ほどかかるそうです。
CDショップなどの視聴サービスでアルバム全曲サビ演奏というようなことをするのに有効。 それ以外でもプレーヤの中に入ってる曲のサビを抽出してそこだけ聞くなんていう聴き方も面白そうですよね。 iPodみたいに入る曲数が膨大なプレーヤだとかなり面白い聴き方になるんじゃないかな? iTunesにこの機能を実装すれば簡単にできそうだし。 選曲と同期できたりするとより有効な機能になりそうですね。

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