Example of speech waveform uttered by a male subject about the word ‘‘problems.’’ The expanded views of a voiced frame and an unvoiced frame are shown, with the magnitude of the Fourier transorm plotted. The frame is 256 samples in length. to duplicate many of the behaviors and characteristics of real-life phenomenon. However, it is incorrect to assume that the model and the real world that it represents are identical in every way. In order for the model to be successful, it must be able to repl