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Passive cascaded-lattice structures for low-sensitivity FIR filter design, with applications to filter banks

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A class of nonrecursive cascaded-lattice structures is derived, for the implementation of finite-impulse response (FIR) digital filters. The building blocks are lossless and the transfer function can be implemented as a sequence of planar rotations. The structures can be used for the synthesis of any scalar FIR transfer functionH(z)with no restriction on the location of zeros; at the same time, all the lattice coefficients have magnitude bounded above by unity. The structures have excellent passband sensitivity because of inherent passivity, and are automatically internally scaled, in anL_2sense. The ideas are also extended for the realization of a bank ofMFIR transfer functions as a cascaded lattice. Applications of these structures in subband coding and in multirate signal processing are outlined. Numerical design examples are included.

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Circuits and Systems, IEEE Transactions on  (Volume:33 ,  Issue: 11 )