Patent ID: 6546407
Filing Date: 2003-04-08
Classification: H03H

Abstract:
A sample-rate conversion (â€œSRCâ€ ) filter receiving an SRC input and outputting an SRC output, comprising:a first, interpolation filter having a predetermined order and receiving said SRC input; a second, interpolation filter having a predetermined order and receiving the output of said first interpolation filter, said first interpolation filter and said second interpolation filter being cascaded; a third, interpolation filter receiving the output of said second interpolation filter, and having a substantially higher order than said first interpolation filter and said second interpolation filter, and having a predetermined number of operations to calculate the coefficients thereof; a first decimating filter receiving the output of said third interpolation filter; wherein an optimized indexing procedure that automatically determines a subset of operations required to determine said SRC filter output is used to reduce computations involved in implementing said filters.