Patent ID: 6125155
Filing Date: 2000-09-26
Classification: H03H

Abstract:
A digital filter method comprising the following steps:input signal data x(n) is sampled at the input sampling frequency Fe and is shared between and stored in a plurality of Q memories of shift register or FIFO type, respectively associated with the Q branches of the filter;the filter coefficients g.sub.m (p) are stored in at least one other memory referred to as a ""coefficient"" memory;interpolation by L is performed on each branch;said data samples x(n) are multiplied by the said coefficients g.sub.m (p) at the rate of the output frequency Fs; anddecimation by M, enabling the working frequency of the filter to be lowered to the output frequency Fs=(L/M)Fe, where L and M are integers and L/M<1.