Efficient frequency-response-masking based FIR filter structures for interpolation and decimation
Håkan Johansson · 2003
This paper introduces FIR filter structures for interpolation and decimation by integer factors. They are based on the frequency-response masking (FRM) approach in which the overall filter makes use of periodic model filters and nonperiodic masking filters. By using FRM techniques it is possible to obtain FIR filters requiring few arithmetic operations even when the transition band is narrow. Further, in the proposed interpolator and decimator structures, all filtering is performed at the lowest of the two sampling rates involved which results in a low overall arithmetic complexity. x(n) fs x(m) Mfs z –1 z –1