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Decimating a discrete time cosine function

Decimating a discrete time cosine function
  1. What is the function of decimator?
  2. How do you find the decimation factor?

What is the function of decimator?

Decimation reduces the original sample rate of a sequence to a lower rate. It is the opposite of interpolation. decimate lowpass filters the input to guard against aliasing and downsamples the result.

How do you find the decimation factor?

The decimation factor is simply the ratio of the input rate to the output rate. It is usually symbolized by “M”, so input rate / output rate=M.

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