MULTI-RATE FILTER SYSTEM

摘要

A multi-rate filter system is disclosed. More particularly, a computationally efficient multi-rate filter system for processing an audio stream on a consumer electronics device is disclosed. The multi-rate filter system includes a plurality of multi-rate filtering blocks, at least one block including a linear filter component. At least one multi-rate filtering block may include a nonlinear signal processing components. The multi-rate filter system may include a nonlinear functional block. A method of filtering a signal is also disclosed.

主权项

1. A multi-rate filter system comprising:
an input channel configured to receive an input signal; an output channel configured to output a filtered signal; a cascade of multi-rate filter blocks coupled between the input channel and the output channel, at least one of the multi-rate filter blocks comprising: a bandselector comprising a bandselector input, a highpass bandselector output, a lowpass bandselector output connected to a subsequent multi-rate filter block, and a downsampler connected between the bandselector input and the lowpass bandselector output; a signal processing block coupled to the highpass bandselector output, the signal processing block comprising a linear filter component; and a bandcombiner connected to the signal processing block, the bandcombiner comprising two bandcombiner inputs, a bandcombiner output, and an upsampler, the first bandcombiner input connected to the signal processing block, the second bandcombiner input connected to a subsequent multi-rate filter block, and the bandcombiner output connected to a prior multi-rate filter block, the upsampler connected between the bandcombiner inputs and the bandcombiner output.