Combining elements to form links

Here are two examples of links. Both links use the same set of elements: e1, e2, e3, but in different sequences: the link on the left is e1, e2, e3; the link on the right is e1, e2, e3, e2, e1.

1in 3.5in

The duration of the first link is the sum of its elements' durations: $e1 + e2 + e3$. Its frequency is $sampling\_rate / link\_duration$.

The duration of the second link is $e1 + e2 + e3 + e2 + e1$. Its frequency will thus be lower than the first link, since its duration is longer.