Patent ID: 6834292
Filing Date: 2004-12-21
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 of:operating on said input stream of sampled data with a first interpolation filter routine to produce a first stream of intermediate data; operating on said first stream of intermediate data with a second, cascaded interpolation filter routine, having a transfer function of: H&af;(z)=(&Sum;k=0R3-1&it;z-k)r,wherein R is an interpolation factor of said second interpolation filter routine, and r is an effective number of cascade stages of said second interpolation filter routine, wherein r is greater than one, to produce a second stream of intermediate data; andoperating on said second stream of intermediate data with a decimating filter routine to produce said output stream of data.