High Frequency Stimulator 是大名鼎鼎的合成器公司 rgcAudio 搞的，把高频突出
他们说：有两种方式提高高频，一是提高高频的振幅，就是EQ和filter啦，二是增加泛音。也就是激励器或者BBE之类。我们这个软件属于后者。
There are two ways to increase high frequency contents of source material: levering high harmonics amplitude (filters, graphic, paragraphic and parametric equalizers, spectral enhancers) or adding to the source harmonic content not originally present (aural exciters, BBE®). HF Stimulator works this last way.
HF Stimulator is incredibly powerful to make that voices "airy", to artificially recreate high frequency contents of low samplerate wav's and to "candy coat" any track that needs to cut when played back on tiny speakers, for the web, and broadcasting on radio or TV.
The transform uses a high pass filter with variable frequency setting followed by a soft waveshaper. It generates harmonic content not present in the original material.
注意这是一个 DX 效果器插件。下载
http://www.rgcaudio.com/downloads/hfstimdx10.exe
我试了一下，还可以。但千万别把它跟EQ弄混了，它的效果跟EQ大不相同，并非是一个应该经常使用的效果器。