Patent ID: 6487573
Filing Date: 2002-11-26
Classification: H03H

Abstract:
A method for providing a sample-rate conversion (â€œSRCâ€ ) filter on an input stream of sampled data provided at a first rate, to produce an output stream of data at a second rate different from said first rate, comprising the steps ofoperating on said input stream of sampled data with a first low-order interpolation filter routine to produce a first stream of intermediate data; operating on said first stream of intermediate data with a first simplified interpolation filter routine, having a substantially small number of operations to calculate the coefficients thereof, to produce a second stream of intermediate data; operating on said second stream of intermediate data with a first decimating filter routine to produce said output stream of data; and applying an optimizing indexing procedure in performing instructions of said routines so as to not execute only those instructions that do not generate intermediate data on which said output stream of data is based.