Patent ID: 7403962
Filing Date: 2008-07-22
Classification: H03H

Abstract:
1. A method for designing an interpolation filter, the method comprises: partitioning interpolation filtering into a plurality of interpolation filtering stages, wherein each of the plurality of interpolation filtering stages includes a corresponding up sampling stage and a corresponding filtering stage, and wherein the plurality of interpolation filtering stages is cascaded together; based on a first digital signal processing identity, manipulating a first one of the interpolation filtering stages to produce a first equivalent interpolation filtering stage; based on the first digital signal processing identity, manipulating a second one of the interpolation filtering stages to produce a second equivalent interpolation filtering stage; and simplifying the first and second equivalent interpolation filtering stages to produce at least a simplified portion of the interpolation filter, wherein the simplified portion is operable to provide up-sampling and filtering functions substantially equivalent to the first one and second one of the interpolation filtering stages.