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THEORY AND DESIGN OF UNIFORM FILTER BANKS USING ALL-PASS FILTERS |
Wang Wenbo; Wang Dejuan |
Beijing University of Posts and Telecommunications Beijing 100088 |
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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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Received: 23 July 1991
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