A system and method for analyzing normalized patient voice feedback in an automated collection and analysis patient care system is described. The changeable coefficients enable the converter to account for noise mixed with the input signal, circuit non-linearities, and component variations. The second assembly includes at least one hook groove and at least one locating groove. Additionally, in a first mode the output image displayed includes the first identifier and in a second mode the output image displayed includes the depth map and the first identifier. In some embodiments, the SF-TT projector uses trapezoid functions in both the axial and transaxial directions.