The screen reader then renders that information using specialized text-to-speech hardware, software speech synthesizers, Braille displays, or some combination thereof.

然后屏幕阅读器利用专门的文本到语音转化硬件、软件语音合成器、盲文显示，或其他组合提出信息。

youdao

They cost hundreds or even thousands of dollars less than hardware synthesizers, and if you have a PowerBook or an iBook, they're a lot more portable.

CNN: Create your own music on the Mac