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Feedback（借入粵語作粵拼：fit1 bek1），用漢字嘅話又有譯做回輸或者反
雖然 fit1 bek1 存在喺好多唔同嘅領域嘅學科理論當中，但係基本可以按照 feedback 嘅效果分成兩種，
用極性來講，正 fit1 bek1 個極性同 input 量極性一樣，負 fit1 bek1 個極性同 input 量極性相反。
一啲平日見到嘅例，係打上電台風煙節目（phone-in）嘅聽眾唔閂收音機，收音機播出把聲即時通過電話變成 input，出現嘅 we we 聲，喺唱歌嗰時個咪高峰擺得太近個音響喇叭都有呢個問題。
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