sqrt in time - effect in freq?

This relates to an earlier post - "filter of amplitude versus filter
of (I,Q)?".

I would like to learn what is the effect in the frequency domain of
taking the square root of a quantity on the time domain. Also, of
taking the square (actually magnitude of a complex number) in the time
domain?

I think I know the second - the magnitude is number*complex_conjugate
which is autocorrelation of the frequency spectrum - but I dont know
the first.

Thanks,

Chris
==================
Chris Bore
BORES Signal processing
www.bores.com
chris@xxxxxxxxx
.

Relevant Pages

  • filter of amplitude versus filter of (I,Q)?
    ... I have a client who filters complex data. ... They first calculate the magnitude, then filter that. ... BORES Signal processing ...
    (comp.dsp)
  • Re: Need help for some simple questions
    ... >>you do the filter design and analysis (i.e find out how the filter ... >>or specify what you want the filter to do) in frequency domain, ... >>> spectral subtraction to estimate the clean speech before weiner ... >>and phase of both signal and noise. ...
    (comp.dsp)
  • Re: DC of a filter
    ... The output of a full wave or half wave rectifier could also ... For a linear time invariant filter, if you put in a sine wave at some frequency f you'll get a sine wave at the same frequency out; the ratio of the amplitudes of the two sine waves are the filter's gain. ... mostly) analyzing the filter's behavior in the frequency domain is so much easier than trying to analyze it's behavior in the time domain that no one bothers with trying to stay in the time domain. ...
    (comp.dsp)
  • Re: Low pass filter
    ... To create a low pass filter in the frequency domain, ... apply your filter directly to the raw data (no fft) and see ... I want to apply a low pass filter to get rid of undesired high frequency ...
    (comp.dsp)
  • Re: Is the output of an analog filter real or the magnitude?
    ... On an oscilloscope, you get the magnitude. ... what you get out of most linear analog filters. ... If the analog filter is a ... Bob's first tier response was only weird-looking ...
    (comp.dsp)