The second patent describes a "noiseless cooling device," meant to strip heat from internal electronics such as hard drives, batteries, CPUs and various other forms of circuitry. The technology relies on a piezoelectric system, which instead of operating a fan, vibrates a special surface to force air to circulate. Apple notes that this concept can apply not just to computers but cellphones, media players, power supplies and monitors. The remaining patent describes a more CPU/GPU-efficient means of applying Gaussian blur. The technique involves several downsamplings followed by an upsample, and more importantly, using a "truncated" Gaussian filter in the down phase along with linear interpolation in the up phase. This is said to dramatically reduce the burden on processors, especially with a dedicated graphics chip, and more so as the size of a blur grows.