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Efficient arbitrary sampling rate conversion with recursive calculation of coefficients

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2 Author(s)
Russell, A.I. ; Res. Lab. of Electron., MIT, Cambridge, MA, USA ; Beckmann, P.E.

In this paper, we present a novel algorithm for sampling rate conversion by an arbitrary factor. Theoretically, sampling rate conversion of a discrete-time (DT) sequence can be performed by converting the sequence to a series of continuous-time (CT) impulses. This series of impulses is filtered with a CT lowpass filter, and the output is then sampled at the desired rate. If the CT filter is chosen to have a rational transfer function, then this system can be simulated using a DT algorithm for which both computation and memory requirements are low. The DT implementation is comprised of a parallel structure, where each branch consists of a time-varying filter with one or two taps, followed by a fixed recursive filter operating at the output sampling rate. The coefficients of the time-varying filters are calculated recursively. This eliminates the need to store a large table of coefficients, as is commonly done

Published in:

Signal Processing, IEEE Transactions on  (Volume:50 ,  Issue: 4 )

Date of Publication:

Apr 2002

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