The echo canceller includes an adaptive finite impulse response filter that generates an adaptive filter weight vector 此?音消除系統(tǒng)由一適應(yīng)性有限脈沖響應(yīng)濾波器所組成,它能產(chǎn)生一組適應(yīng)性濾波器權(quán)值向量。
Because period narrow band signals are the main part of background noises , this thesis uses hardware description language to design a multi - band finite impulse response filter ( fir ) and downloads the program into filed programmable gate array to eliminate the period narrow - band interferences in the background noises 3 )在現(xiàn)場環(huán)境中,背景干擾主要是周期性的窄帶,本文利用硬件描述語言( vhdl )設(shè)計了一個多帶fir有限沖擊響應(yīng)濾波器。應(yīng)用到可編程邏輯器件中,消除了背景噪聲中的周期性干擾,為信號的進一步處理提供盡可能干凈的信號。