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Subject: Re: Energy Density Spectrum to Time Series
Date: Mon, 1 Dec 2008 14:26:02 +0000 (UTC)
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"SmartEngineer" <smartengineer@mathworks.com> wrote in message <gh0r9m$hl6$1@fred.mathworks.com>...
> Hi,
>    I need an application for which input is the Energy Density Spectrum as a function of "w" and output should be a time series.If any body does have any idea or code already done and verified,You may please share.
> 
> Thanks in advance.

typically you go from an amplitude and phase representation back to a time series with ifft.  but that requires both amplitude and phase to properly recreate the original wave.  if the 'energy density' is just a magnitude you could try to use ifft, but without phase information it is unlikely that it would faithfully reproduce the original waveform.  it would of course have the same spectrum magnitude, but not necessarily the the same as the original.