Patent ID: 7664808
Filing Date: 2010-02-16
Classification: H03H

Abstract:
1. A Finite Impulse Response (FIR) filter comprising: a plurality of sample and hold circuits operative to sample an input signal and to provide a plurality of input samples; a real-time coefficient determinator system including: a first lookup table; a second lookup table; a sine function generator that receives the input signal and that utilizes the first lookup table to generate a sine for each of the input samples; an inverse function generator that receives the input signal and that utilizes the second lookup table to generate an inverse for each of the input samples; a first multiplier that generates a sinc as a product of the corresponding sine and inverse for each of in the input samples; and a coefficient determinator that generates a coefficient for the sinc for each input sample; a plurality of second multipliers that are each coupled to at least one of the sample and hold circuits and the real-time coefficient determinator system; and an accumulator that is coupled to each second multiplier so as to provide a filtered signal.