New design npproaches of two-channel perfect-reconstruction finite-duration impulse-response (FIR) quadrature mirror-image filter (QMF) banks with low delays are presented. The approaches depend on constraint optimization methods. The designs are considered superior relative to the existing approaches from the quality of reconstruction perspective. A computationally efficient iterative technique is applied to design cosine-modulated, M-channel pseudo-QMF banks. Moreover, a new weighted least-squares (WLS) method is applied to the Jesign of two-channel linearphase FIR QMF banks.

An algebraic mapping methodology to map decimator and interpolator algoritluns onto very large scale integration (VLSI) array-processor structures is developed. Array-processor implementations for finite-duration impulse response as well as infinite-duration impulse response (IIR) filter banks are obtained based on the polyphase structures of decimators and interpolators. New and efficient arrayprocessor implementations for FIR filter banks are also obtained based on dil'ectform structures of decimators and interpolators. All the implementations are considered modular and regular. Furthermore, some of the implementations have local communication features.

Improved and new-array processor implementations for FIR filters and linear-phase FIR filters are developed. New high-speed area-efficient fixed-point processors are developed to be incorporated in the resulting implementations.