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# Long description

This figure consists of two parts.

Part (a) is a simple block diagram showing a three-term averaging filter with input x[n] and output y[n].

Part (b) is a graph of x[n] against n. Input samples x[n], represented as usual as vertical lines extending from the horizontal axis with filled circles at the end, are shown for integer values of n from minus 3 to 5. The values are as follows:

- when n is minus 3, x[n] is 0

- when n is minus 2, x[n] is 0

- when n is minus 1, x[n] is minus 1

- when n is 0, x[n] is 2

- when n is 1, x[n] is 4

- when n is 2, x[n] is 6

- when n is 3, x[n] is 4

- when n is 4, x[n] is 0

- when n is 5, x[n] is 0.