Adjustable fractional-delay FIR filters using the Farrow structure and multirate techniques
2006 (English)In: Asia Pacific Conference on Circuits and Systems,2006, 2006, 1055-1058 p.Conference paper (Refereed)
The Farrow structure can be used for efficient realization of adjustable fractional-delay finite-length impulse response (FIR) filters, but, nevertheless, its implementation complexity grows rapidly as the bandwidth approaches the full bandwidth. To reduce the complexity, a multirate approach can be used. In this approach, the input signal is first interpolated by a factor of two via the use of a fixed half-band linearphase FIR filter. Then, the actual fractional-delay filtering takes place. Finally, the so generated signal is downsampled to retain the original input/output sampling rate. In this way, the bandwidth of the fractional-delay filter used is halved compared to the overall bandwidth. Because the complexity of halfband linear-phase FIR filter interpolators is low, the overall complexity can be reduced. In this paper, we present more implementation details, design trade-offs, and comparisons when the filters are implemented using multiple constant multiplication techniques, which realize a number of constant multiplications with a minimum number of adders and subtracters.
Place, publisher, year, edition, pages
2006. 1055-1058 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-37079DOI: 10.1109/APCCAS.2006.342270Local ID: 33613OAI: oai:DiVA.org:liu-37079DiVA: diva2:257928