An apparatus and method for eliminating noise of a received image and compensating its sharpness is provided. Also provided in the invention are polynucleotides and vectors that encode such molecules and host cells that harbor the polynucleotides or vectors. There is a load shaft for applying a load to the second support and an articulated joint between the load shaft and the second support for uniformly distributing the load to the first support. A frequency of the carrier wave is varied for the pulse width modulation. The invention also relates to molds for making such precast, prefabricated panels.