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More generally,
so that the spectral bandwidth of is times that of
, in general.
In summary, the spectrum at the output of the square-law nonlinearity can
be written as
This illustrates the great value of series expansions for
nonlinearities. In audio signal processing systems, it is essential
to keep track of the spectral representation of all output signals,
since we hear directly in terms of signal spectra.R.4
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