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.
Carrier frequency. Carrier frequency in fact causes the audible noise. You can diminish the noise with high frequency ripple filters which will add cost to the installation. This may be necessary in places where the public or employees are in close proximity to the SMPS or VFD.