Installing ceramic or porcelain tile is both an art and a science. Tile installers must know the composition of the tiles as well as how to lay them in place attractively. Besides the normal costs of labor and materials, a tile project's costs vary by the type of sub-flooring to be used as a foundation for the tile.
Three things can cause an EMI problem: A signal source creates some kind of noise, there is a transmission path for the noise, and/or there is a receiver sensitive enough to be distorted by the noise, as shown in Figure 1.
Fridge noises are a common problem in homes around the world and generate regular complaints from consumers. Around half of householders are disturbed by the noises their fridges produce, according to some surveys. While most sounds, such as hums and whirring can be traced to the compressor or condensor fan inside the appliance, the random knocks and cracks that come from fridges have been a mystery.