全通多相網(wǎng)絡(luò)濾波器組的理論和設(shè)計
THEORY AND DESIGN OF UNIFORM FILTER BANKS USING ALL-PASS FILTERS
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摘要: 本文進一步研究了應(yīng)用全通濾波器實現(xiàn)均勻N帶濾波器組的設(shè)計理論。我們提出了一種兩級全通型濾波器組的結(jié)構(gòu),第一級為周期性鏡像半帶濾波器,第二級為兩個N/2帶的帶通濾波器組。第一級的阻帶恰好可以抑制第二級的不可控帶,實現(xiàn)了全通型多相濾波器的連續(xù)阻帶持性。并且給出了綜合濾波器組的實現(xiàn)方案,可以使整個分析/綜合系統(tǒng)完全消除混疊和幅度失真。最后本文給出了一個實例。
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關(guān)鍵詞:
- 全通濾波器; 濾波器組; 正交鏡像濾波器
Abstract: The theory of uniform filter banks using all-pass filters is further developed. A filter-bank structure using two-stage all-pass filters is proposed. The pre-stage is half-band filters with period, the post-stage is two pass-band filter banks. The stopband of the pre-ttage filter just controls the don t-care band of the poststage filter using all-pass polyphase, so that a realization of continuous stopband property is obtained Moreover, a method of implementing synthesis filter banks is given, which eliminates aliasing and amplitude distortions of analysis/synthesis system. Finally, an example is listed. -
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