The Haar wavelet is the first known wavelet and was proposed 1909 by Alfred Haar[?]. Note that the term wavelet was coined much later. The Haar wavelet is also the simplest possible wavelet. It looks like that:
| √1/2 ****O | | 0 *****O-------**** | | -√1/2 | ****O 0 1/2 1
The disadvantage of the Haar wavelet is that it is not continuous and therefore not differentiable.
Remark: The Haar Wavelet can also be described as a step function f(x) with:
f(x) = 1 (if 0 <= x < 1/2)
f(x) = -1 (if 1/2 <= x < 1)
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