Minimum denominator-multiplier pipelined recursive digital filters

Many digital signal processors (DSPs) and also microprocessors are employing the single-instruction multiple-data (SIMD) paradigm for controlling their data paths. Although the SIMD paradigm can provide high computational power and efficiency, not all applications can profit from this feature.One important application, particularly in audio processing, of DSPs are recursive (IIR) filters. Due to their datadependencies they can not exploit the capabilities of SIMD-controlled DSPs as non-recursive (FIR) filters can. This paper shows, how the SIMD control scheme can be enhanced to accommodate recursive filters without introducing much hardware overhead.Three methods for calculating recursive filters on SIMD-controlled DSPs and their requirements for control and data transfer are presented. They can be applied to direct-form as well as cascade-form realizations. The performance and hardware requirements of these methods are evaluated to determine the most efficient solution in terms of the AT-product.

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Pipelined lattice digital filters utilizing asymmetrical look-ahead

Serna¹,

Soderstrand²

IEEE Pacific Rim Conference on Communications, Computers, and Signal Processing. Proceedings

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Chung and Parhi have introduced a simple design scheme for obtaining k-parameters of pipelined lattice IIR digital filters utilizing the scattered look-ahead technique [l]. Here we show that this method actually requires double the delay suggested in order t o accomodate the required delay compensation within lattice feedback loops.We propose a pipelined minimum-multiplier lattice digital filter design method which utilizes asymmetrically scattered look-ahead as in the MDM technique for direct form structures. A search algorithm selects coefficients for a pre-specified frequency response, as in scattered look-ahead. T h e result are digital filters with lower order, and thus fewer latches and multipliers.This method does not require pole-zero cancellation, since all pipelined poles contribute t o the desired response. As was the case for direct form structures, this minimum-multiplier approach of utilizing asymmetrically scattered look-ahead is demon-. strated t o be superior t o the stricter sub-case of the scattered look-ahead technique.

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Minimum denominator-multiplier pipelined recursive digital filters

Cited by 3 publications

References 18 publications

On Enhancing SIMD-Controlled DSPs for Performing Recursive Filtering

On Enhancing SIMD-Controlled DSPs for Performing Recursive Filtering

On Enhancing SIMD-controlled DSPs for Performing Recursive Filtering

Pipelined lattice digital filters utilizing asymmetrical look-ahead

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