Patent ID: 9419826
Filing Date: 2016-08-16
CPC Classification: H03H,H04L

Claim Text:
1. An adaptive filtering method based on an error sub-band, the method comprising: receiving, by an adaptive filter, an input signal; performing adaptive filtering processing on the input signal according to an adaptive filtering weight currently stored in the adaptive filter, so as to obtain an adaptive filtering signal, and transmitting the adaptive filtering signal to a subtractor, wherein the adaptive filter has L branches that comprise a first branch to an L receiving, by the subtractor, a reference signal and the adaptive filtering signal; performing a calculation according to the reference signal and the adaptive filtering signal to obtain an error signal; transmitting the error signal to an error sub-band filter, wherein the reference signal is a signal generated after the input signal passes through a real channel; receiving, by the error sub-band filter, the error signal; performing sub-band analysis filtering processing on the error signal to obtain an error sub-band signal; transmitting the error sub-band signal to an adaptive weight updater; receiving, by an input signal analysis filter, the input signal; performing sub-band analysis filtering processing on the input signal to obtain an input sub-band signal; transmitting the input sub-band signal to the adaptive weight updater; receiving, by the adaptive weight updater, the error sub-band signal and the input sub-band signal; performing calculation according to the error sub-band signal and the input sub-band signal to obtain a new adaptive filtering weight; and replacing the adaptive filtering weight currently stored in the adaptive filter with the new adaptive filtering weight.