Title :
Efficient rational sampling rate alteration using IIR filters
Author :
Russell, Andrew I.
Author_Institution :
Res. Lab. of Electron., MIT, Cambridge, MA, USA
Abstract :
The problem of changing the sampling rate of a signal by a rational factor of L/M is discussed. It is shown that infinite impulse response (IIR) filters can be efficiently implemented using the polyphase decomposition. The computational cost of the recursive and nonrecursive parts of the interpolation filter are considered separately, and a gain in efficiency of a factor of LM/(L+M-1) is achieved for the recursive part. This gain is only significant when both L and M are larger than one.
Keywords :
IIR filters; filtering theory; interpolation; rational functions; signal sampling; IIR filters; efficiency; infinite impulse response filters; interpolation filter; polyphase decomposition; rational factor; signal sampling rate alteration; Computational efficiency; Finite impulse response filter; Frequency conversion; IIR filters; Interpolation; Low pass filters; Sampling methods; Signal processing; Signal sampling; Terminology;
Journal_Title :
Signal Processing Letters, IEEE
