環(huán)移SG自適應(yīng)濾波器及其在交疊的周期性生物電信號分離中的應(yīng)用
LOOP-SHIFT S G ADAPTIVE FILTER AND ITS APPLI- CATION IN SEPARATION OF OVERLAPPED PERIODIC BIOMEDICAL SIGNALS
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摘要: 本文提出了一種適用于交疊周期信號的周期檢測和信號分離的環(huán)移StopGo(SG,停止-進(jìn)行)自適應(yīng)數(shù)字濾波器。該濾波器對周期信號在頻域的交疊程度沒有任何要求。除假設(shè)已知要分離的周期信號的周期的大致范圍外,不需其他先驗(yàn)知識。因而它提供了一種分離時域和頻域都互相交疊的周期信號的有效可行的方法。文章從理論上討論了該濾波器的收斂條件和各參數(shù)的選取要求,并提出了一種較實(shí)用的粗精度周期搜索和通道自動關(guān)閉算法,減少了計(jì)算量。實(shí)驗(yàn)證明該濾波器對各種不同初始相位、不同相對幅度的周期信號交疊而成的信號均能有效地分離。
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關(guān)鍵詞:
- 自適應(yīng)濾波器; 周期信號; 收斂性
Abstract: A loop-shift Stop Go adaptive digital filter with applications in period detection and signal separation of overlapped periodic signals is presented. The filter places no contraints on the overlapped forms and requires no priori knowl edge except for approximate period range for signals to be separated, therefore it provides for an efficient and feasible method for separating periodic signals overlapped both in time and frequency domains. The convergence speed of the filter and the requirements of all parameter selections are discussed,meanwhile thecoarse precision period search and channel automatic close algorithm are proposed to reduce the amount of computation. Experiments show that the filter can separte all kinds of overlapped periodic signals with different initial phases and different relative magnitudes. -
Van Bemmel J H. IEEE Trans. on BME, 1968, RME-15(1): 17-23.[2]Widrow B, Glover J R, McCool J M. Proc[J].IEEE.1975, 63(12):1692-1716[3]Ferrara E R, Widrow B. IEEE Trans[J].on BME.1982, BME-29(6):458-460[4]Stubbe R J. Journal of Acoust. Soc. Am., 1988, 84(12): 1236-1249.[5]鄒謀炎,柴振明.第9屆電路與系統(tǒng)年會.黃山:1990年9月.[6]朱貽盛,李丹,李宏志,朱斌.信號處理,1992,8(4): 202-210. -
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