然而,内耳不仅仅负责从外部环境中搜集声音。由身体内发出的声音同样可以震动该结构。当你说话的时候,声带的快速振动带动脑壳振动。“当你说话的时候,喉咙中发声会导致你的皮肤、头骨和口腔共鸣,由此我们得到了通常意义上的声音。”范德堡大学听力学教授本·霍恩斯比解释说。
But sound doesn't travel through bone nearly as easily as it does through air. This added resistance causes the waveform frequency to drop, lowering the pitch of the sound you hear internally and creating a sort of feedback effect that stimulates the eardrum from both sides. This effect is heightened by the fact that you really can't hear your own voice directly. Because your ears are positioned behind your mouth, the sounds coming out of your mouth must first bounce off objects and back into your ears. This too causes the waveform to lose energy as well as, in turn, frequency and pitch, resulting in you hearing a distorted, lower tone than what people hear directly from out of your mouth.
但是声音穿过骨头的过程远不如在空气中传播顺畅。声波降调的可能性增加,并且随着鼓膜双次振动带来的反馈效应,音高也会随之降低。因此,我们并不能真正直接听到自己的声音。由于耳朵位于嘴巴之后,从口中发出的声音必将先弹到某样物体上随之再传入耳朵。这同样使声波能量降低,随之带来音调和音高的降低,使得我们自己听到的声音远低于周围人直接听到的声音。
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