Patent ID: 8606836

Claim:
An apparatus for frequency division and filtering, comprising: a memory unit, for storing sample data; an extrema calculation unit, for outputting and storing a plurality of maximum values and a plurality of minimum values of the sample data to the memory unit; an envelope calculation unit, for calculating a mean envelope according to the maximum values and the minimum values, wherein within a duration when the envelope calculation unit calculates an upper envelope and a lower envelope respectively according to the maximum values and the minimum values, the envelope calculation unit outputs a value of the mean envelope to the memory unit according to a value of the upper envelope and a value of the lower envelope with respect to a corresponding identical address; and a control unit, for generating values of a component signal according to values of the mean envelope and the sample data, wherein the control unit controls the extrema calculation unit and the envelope calculation unit to decompose the sample data into a plurality of intrinsic mode functions according to the values of the component signal by using an empirical mode decomposition method.