In most cases, a cardioid pattern ( directional ) will produce more gain - before - feedback than an omni - directional microphone.

在大多数情况中, 心形图型 ( 指向性 ) 相比无指向性麦克风会得到更多的反馈前增益.

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The cardioid pattern can also be used to reduce of an orchestra or audience noises.

心形也可用于减少管弦乐队或观众的噪声.

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