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4.5 Resampling with rational factor

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

Interpolation by L and decimation by M can be combined to change the effective sampling rate of a signal by the rational factor L M . This process is called resampling or sample-rate conversion . Rather than cascading an anti-imaging filter for interpolation with an anti-aliasingfilter for decimation, we implement one filter with the minimum of the two cutoffs L M and the multiplication of the two DC gains ( L and 1 ), as illustrated in .
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Source:  OpenStax, Fundamentals of signal processing. OpenStax CNX. Nov 26, 2012 Download for free at http://cnx.org/content/col10360/1.4
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