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Resampling with Rational Factor

Module by: Phil Schniter. E-mail the author

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Summary: Describes the process of resampling, or sample-rate conversion.

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Interpolation by LL and decimation by MM can be combined to change the effective sampling rate of a signal by the rational factor LMLM . This process is called resampling or sample-rate conversion. Rather than cascading an anti-imaging filter for interpolation with an anti-aliasing filter for decimation, we implement one filter with the minimum of the two cutoffs πLπML M and the multiplication of the two DC gains (LL and 11), as illustrated in Figure 1.

Figure 1:
Figure 1 (m10448fig1.png)

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