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[SOLVED] Why use the Hilbert transform in digital filter?

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Sandi2000

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Digital Hilbert transformers are a special class of digital filter whose characteristic is to
shift- the negative frequency signal's phase +90 degree ,
- and the positive frequency signal's phase -90 degree ,
of the input signal.
the relation between Complex signals, analytic signals and Hilbert transformers is:
A real signal is a one-dimensional variation of real values over time. A complex signal is a
two-dimensional signal whose value at some instant in time can be specified by a single
complex number. The variation of the two parts of the complex numbers, namely the real
part and the imaginary part,...,the real part and the imaginary part of the analytic signal are related trough the Hilbert transform.

That is mean for apply the hilbert transform in digital signal must be have a complex value,can any one help me how to use the complex value of digital filter with hilbert transform?
Thank you in advance:)
 

Thank you ,that SSB generator is given me an idea about applications the hilbert transform .
 

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