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IFIR Filters with Improved Efficiency for Filter Banks and Trans Multiplexers

Jyotsna Ogale, Alok Jain


In this paper, a new approach to design multiplier-free
interpolated finite impulse response digital filter is presented. The
approach is based on two step procedure, coefficient rounding and
sharpening with no recursion equation. Interpolated finite impulse
response approach is a very efficient method for designing sharp
transition band filters. With this approach, filter with reduced number
of multiplier coefficients is designed that permits efficient hardware
implementation. The hardware complexity of the filter can be further
reduced by employing rounding and sharpening technique. The
prototype filter is formulated as a rounded and sharpened interpolated
finite impulse response (R&S IFIR) filter. The prototype filter is then
used to design the filter bank. Examples show that without introducing
additional delay, the proposed approach provides better performance
with reduced computational cost.


Interpolated Finite Impulse Response Filter, Filter Bank, Cosine Modulation, Rounding Factor, Sharpening Polynomial

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