短語詞組短語Background signal suppression 背景信號抑制dynamic background signal generator 動態(tài)背景信號産生器dynamic background signal 動態(tài)背景信號signal background 背景信號signal background ratio 信背比signal induced background 像增強(qiáng)器光生背景噪聲signal to background 信號本底比signal to background ratio 信號背景比Signal -background ratio 信背比 返回 background signal