一種新型的空間聲回波消除器
A NEW ACOUSTIC ECHO CANCELLER
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摘要: 空間聲回波消除因回波通道沖激響應(yīng)長(zhǎng)達(dá)幾百毫秒一直是信號(hào)處理領(lǐng)域的一個(gè)難題.本文設(shè)計(jì)了空間聲回波消除器,提出了自正交輪流受限分段批處理頻域LMS(PBFLMS)算法,可以達(dá)到收斂性能、失調(diào)性能、計(jì)算復(fù)雜度以及延時(shí)等性能之間的折衷,并結(jié)合空間聲回波消除器的具體應(yīng)用,改善了該算法。最后將空間聲回波消除器在ATD-C30開(kāi)發(fā)仿真系統(tǒng)中實(shí)現(xiàn),得到了比較滿意的結(jié)果.
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關(guān)鍵詞:
- 自適應(yīng)濾波器; 空間聲回波消除器; 頻域LMS算法
Abstract: Because the impulse response of an acoustic echo path may be several hundred milliseconds long, acoustic echo cancellation is a long-stranding problem and has not been solved effectively. In order to solve this problem an acoustic echo canceller is presented and a new algorithm, self-orthogonalizing alternative constrained Partitioned Block Frequency-domain LMS (PBFLMS) algorithm, is put forward in this paper. This algorithm has good convergence ability, small misadjustment, low computation complexity and small delay. In addition, according to the application on the acoustic echo canceller, this algorithm is modified. Finally the whole echo canceller is implemented by using a single TMS320C30 processor in the ATD-C30 simulator and satisfying results are acquired. -
Zitewitz A V. Consideraions on acoustic echo cancellation on real time experiments. Proc. EU-SIPC090, Barcelona, Spain: 1990, 1987-1990.[2]Paez Borallo J M, Garcia Otero M. On the implementation of a partitioned block frequency domain adaptive filter (PBFDAF) for long acoustic echo cancellation[J].Signal Processing.1992, 27(3):301-315[3]Sommen P C W. On the convergence properties of a partitioned block frequency domain adaptive filter (PBFDAF), Signal Processing V: Theories and Applications. Proc. of EUSIPCO, Barcelona, Spain: 1990,201-204.[4]胡春風(fēng).自適應(yīng)算法的研究及其在空間聲回波消除中的應(yīng)用:[碩士論文].北京郵電大學(xué),1995, 12. -
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