These perceptual transformations are powerful because nothing changes in the acoustic signal itself. That is held fixed.

“这些感知转换很强大，因为声音信号本身没有任何变化。那是恒定不变的。

… making an electrical signal into an acoustic signal… Elena: Hang on. Run me through that again.

...把电子信号转换成听觉信号...-等等，再说一遍。

To get a sense of how these techniques work, let’s look at some speech, specifically, the acoustic signal.

为了了解这些技术是如何工作的，让我们看一些语音，特别是声音信号。