Title :
Polyphase Decomposition of Digital Fractional-Delay Filters
Author :
Johansson, Hakan ; Harris, Fred
Author_Institution :
Dept. of Electr. Eng., Linkoping Univ., Linkoping, Sweden
Abstract :
This letter shows that, for arbitrary M-fold polyphase decompositions, the polyphase components of digital fractional-delay (FD) filters correspond to FD filters as well, but with different delays and gains. For even values of M, the components also have additional and different phase offsets. The letter also discusses the application of these results to the optimization of high-order filters with few unknowns.
Keywords :
delay filters; delays; digital filters; optimisation; arbitrary M-fold polyphase decompositions; digital fractional delay filters; high order filters; phase offsets; Approximation methods; Delays; Finite impulse response filters; Frequency response; Information filters; Optimization; FIR filters; fractional-delay filters; high-order filters; polyphase decomposition;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2014.2381603
