HYBRID FINITE IMPULSE RESPONSE FILTER

摘要

In accordance with embodiments of the present disclosure, a hybrid finite impulse response filter having a plurality of delay stages comprising a first filter portion and a second filter portion. In some embodiments, the first filter portion may be a high-rate filter portion associated with a first portion of the plurality of delay stages and configured to filter an input signal having a first sampling rate to generate a first intermediate output signal and the second portion may be a low-rate filter portion associated with a second portion of the plurality of delay stages and configured to filter a downsampled version of the input signal at a second sampling rate to generate a second intermediate output signal. In other embodiments, the first filter portion may include an analog filter portion associated with a first portion of the plurality of delay stages and configured to filter an input signal to generate a first intermediate output signal and the second filter portion may be a digital filter portion associated with a second portion of the plurality of delay stages and configured to filter the input signal.

主权项

1. A hybrid finite impulse response filter having a plurality of delay stages, comprising:
a high-rate filter portion associated with a first portion of the plurality of delay stages and configured to filter an input signal having a first sampling rate to generate a first intermediate output signal; a decimator for downsampling the input signal to a downsampled input signal having a second sampling rate smaller than the first sampling rate; a low-rate filter portion associated with a second portion of the plurality of delay stages and configured to filter the downsampled input signal; an interpolator for upsampling the downsampled input signal as filtered by the low-rate filter portion to generate a second intermediate output signal having a sampling rate larger than the second sampling rate; and a summer for summing the first intermediate output signal and the second intermediate output signal to generate an output signal of the hybrid impulse response filter.