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This paper presents the design of a two-fold symmetric, linear-phase, diamond-shaped FIR filter. The design is based on a Semi-Definite Program (SDP) of moderate dimension in which the passband and the stopband are expressed as intersecting regions of second order trigonometric polynomials. The two-fold symmetric filter is a more general representation when compared with its four-fold symmetric counterpart...
A design method of a linear-phased, two-dimensional (2-D), two-fold symmetric circular shaped filter is presented in this paper. Although the proposed method designs a non-separable filter, its implementation has linear complexity. The shape of the passband and the stopband is expressed in terms of level sets of second order trigonometric polynomials. This enables the transformation of the filter...
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