A wavelet is finite energy and band-pass,
it oscillates in time like a short wave, hence the name "Wavelet". The
wavelet has an average value of zero
The wavelet transform convolves the
signal x(t) with a wavelet family which is the translation and dilation
of a unique wavelet 
where t and s are the translation
and dilation parameters of the wavelet transform.
The wavelet 
works
like a band-pass filter and the wavelet coefficient 
can
be viewed as a filtering of the signal x(t) by the filter, as shown belown.
.
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The Java
Learning Program(Not aviable here, this is a part of the
web course "Wavelet Tutorial" ) show how to extract the different frequency
components by dilation of the mother wavelet.
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