Patent ID: 6427157
Filing Date: 2002-07-30
Classification: H03H

Abstract:
Apparatus for converting the sampling rate of a digital input signal from fx to ((U/D))fx, where U and D are integers, comprisingA. an input lead, the digital input signal coupled to said input lead; B. multiplier means having an output and a first and second input terminals for supplying an output signal that is the product of the signals applied to said first and second input terminal, said input lead coupled to said second input terminal of said multiplier; C. coefficient storage means coupled to said first input of said multiplier means for storing D sets of coefficients, giâŠ•D(n), n=0, 1, . . . , (Qâˆ’1), each of said D sets of coefficients having q elements with the jth element, j=0, 1, . . . , (Qâˆ’1), equal to giâŠ•D(j)=h(jD+(âˆ’iU) modulo D), where the function h denotes the coefficients of a FIR filter having coefficients with unit sample response length N and input index i=âˆ’âˆž . . . 0, 1, . . . âˆž; D. sequence means coupled to said coefficient storage means for sequentially transferring and selecting each coefficient set giâŠ•D(n) coupled to said first input terminal of said multiplier; E. accumulation means coupled to the output of said multiplier means for determining the output partial sums by summing the products supplied by multiplier means; and F. output buffer storage means coupled to said accumulation means for storing the accumulated output sample y(n).