Two-channel linear phase wavelet filter bank with two stages of multiphase substructures

A wavelet filter and linear phase technology, applied in the field of signal processing, can solve the problems of low computing efficiency and high power consumption, and achieve the effect of overcoming the lack of linear phase
CN106411289AInactive Publication Date: 2017-02-15SOUTHWEST UNIVERSITY FOR NATIONALITIES
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTHWEST UNIVERSITY FOR NATIONALITIES
Publication Date
2017-02-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a two-channel linear phase wavelet filter bank with two stages of multiphase substructures, which consists of an analysis filter bank, an extractor, a zero value interpolator and a synthesis filter bank. A multiphase structure of each of both the analysis filter bank and the synthesis filter bank consists of a two-input two-output filter module and a special two-input two-output module. According to the two-channel linear phase wavelet filter bank disclosed by the invention, all filters in the two-input two-output filter module have linear phases, and thus, for the wavelet filter bank disclosed by the invention, an operational speed is the same with that of a multiphase structure wavelet filter bank, but convolution multiplication times are reduced by nearly 50%; and the defect that the multiphase filters of the wavelet filter bank generally do not have the linear phases is overcome. According to the wavelet filter bank disclosed by the invention, the operational speed is the same with that of the multiphase structure wavelet filter bank, but the convolution multiplication times are reduced by nearly 50%, and one order of vanishing moment is inherent in structure; and the two-channel linear phase wavelet filter bank overcomes the defect that the multiphase filters of the wavelet filter bank generally do not have the linear phases, and has wide application prospect.
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Claims

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