DOWNSAMPLING BY AVERAGING WITH REDUCED MEMORY REQUIREMENTS
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United States of America Patent
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Aug 25, 2016
app pub date -
Feb 24, 2015
filing date -
Feb 24, 2015
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Abstract
A method for downsampling digital samples xn, . . . of a signal by a decimation factor d comprising an integer part i using averaging is disclosed. The method includes identifying a partial sum based on the decimation factor and a number N of samples to use for the averaging as a sum Sn+i,n+N−1 of (N−i) samples xn+i, . . . xn+N−1, computing the partial sum, computing a first sum Sn,n+N−1 of a first set of N digital samples xn, . . . xn+N−1 as a sum of a set of i digital samples xn, . . . xn+i−1 and the computed partial sum, computing a second sum Sn+i,n+i+N−1 of a second set of N digital samples xn+i, . . . xn+i+N−1 as a sum of a set of i digital samples xn+N, . . . xn+i+N−1 and the computed partial sum, and downsampling the digital samples based at least in part on the first sum and the second sum.
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