This factor multiplies the sampling interval or, equivalently, divides the sampling rate.
But in signal processing, decimation by a factor of 10 actually means keeping only every tenth sample. When the process is performed on a sequence of samples of a signal or a continuous function, it produces an approximation of the sequence that would have been obtained by sampling the signal at a lower rate (or density, as in the case of a photograph).ĭecimation is a term that historically means the removal of every tenth one. Both downsampling and decimation can be synonymous with compression, or they can describe an entire process of bandwidth reduction ( filtering) and sample-rate reduction. In digital signal processing, downsampling, compression, and decimation are terms associated with the process of resampling in a multi-rate digital signal processing system.
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