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Design of doubly complementary filters with approximate linear phase

Design of doubly complementary filters with approximate linear phase

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A new procedure for the design of a real doubly complementary (DC) pair of digital filters obtained from an all-pass structure is presented. The filter design is based on a zero-phase FIR filter design with multi-band frequency specifications and approximate linear-phase characteristic. The resulting complex or real all-pass filter structure is guaranteed to be stable. Some examples illustrating the design method including comparisons with conventional approximately linear phase IIR filters are also shown.

Inspec keywords: digital filters; FIR filters; linear phase filters; filtering theory; all-pass filters

Other keywords: approximate linear-phase characteristic; doubly complementary filters; multi-band frequency specifications; zero-phase FIR filter; digital filters; real all-pass filter structure; filter design; complex all-pass filter structure

Subjects: Filtering methods in signal processing; Digital signal processing; Digital filters; Digital filters

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