With greater awareness, the slow swell gives way to faster, higher - frequency waves as more electrically active neurons kick in. (discovermagazine.com)
We were blown away when a track with moderate bass started playing, the low frequency waves shaking the car and pounding our ears. (cnet.com)
Because text messaging uses slightly different frequency waves than other cell phone functions, the gadget can not be confused with any other cell phone data or usage. (sinklaw.com)