The present invention relates to a distortion detecting system and a distortion detecting method having a structure for efficiently detecting distortion of a projected image that is projected onto a projected surface by a projector. The ice cube-making machine has an evaporator package, a separate compressor package and a separate condenser package. Using the error locating signal, the system and method converts the differential detection signal into a soft decision signal including multi-level soft values. Accordingly, the current characteristics of the current sources can be made more uniform while reducing their circuit areas, resulting in improving the linearity of the DA conversion characteristic. Various other methods, systems, and computer-readable media are also disclosed. More particularly, disclosed is an apparatus and method to output a musical tone according to motion, which divides a space in which a terminal can move into a plurality of subspaces, and matches the subspaces with different musical tones, so that the terminal can output a musical tone matched with a specific subspace when the terminal has moved into the specific subspace.