directivity index meaning in Chinese

定向系数
定向指数
择向性指数
指向性增益
指向性指数指向性指数

Directivity index of microphone
传声器指向性指数
The al - di ( articulation index weighted - directivity index ) , which is a measure for the improvement of the signal - to - noise ratio , is increased by about 30 percent for the trimictm technology . this corresponds to an improvement in speech intelligibility of up to 30 %
研究亦显示，在吵杂环境中，即语音与噪音的比率较差时，方向性麦克风对听障者尤其有效，言语理解能力可提升至30 % ，使听障者更容易与人交谈。