Method and device of infinite impulse response filteration based on SIMD

The invention provides a method and a device of infinite impulse response filteration based on SIMD. The method comprises the following steps: utilizing a preset filtering coefficient sequence to carry out circular computation of infinite impulse response filtering on an input signal sequence; in each circular computation, utilizing an SIMD instruction to carry out n-power point accumulating computation on corresponding elements in the filtering coefficient sequence and the input signal sequence, wherein the filtering coefficient sequence comprises a plurality of effective filtering coefficients, a zero value used for enabling digits of the filtering coefficient sequence to be aligned and a zero value used for shifting and expanding, and in the n-power point accumulating computation, the effective filtering coefficients in the filtering coefficient sequence are shifted rightwards for 0,1,2 to n-1 elements respectively; utilizing a former result to correct a posterior result in the n-power point accumulating c