Patent ID: 9037625
Filing Date: 2015-05-19
Classification: H03H

Abstract:
1. A method for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth, comprising: a. Applying input samples of said digital signal to an M-1 stage tapped delay line; b. Downsampling said input samples and outputs of said tapped delay line stages by a factor of M; c. Applying said M downsampled values to M allpass IIR filters where the phase of said M allpass IIR filters add constructively at frequencies below a passband frequency, and add destructively at frequencies above a stopband frequency, and where: d. Summing the outputs of said M allpass IIR filters; e. Scaling said sum by a factor of 1/M; and f. Applying said scaled sum to a digital channel filter.