Re: How to shift frequencies in a non-flat manner


john wrote:
> Michel Rouzic wrote:
> > Following somebody's advice, I'm making a topic to expose my problem
> > without talking about possible solutions.
> >
> > But first of all I'd like to restrict this topic to solutions on how to
> > implement frequency shifting (that doesn't involve performing a DFT and
> > shifting bins), I don't want to hear about performing a time-domain
> > convolution with a kernel that changes through time, or doing some
> > stuff I don't understand to get my signal in the DC and the noise in
> > the AC (although I'm sure it would be a very good solution), my goal is
> > not only to find a solution to my problem but also to know at last how
> > to do that precise thing.
> >
> > So here's the problem : I got a signal of about 10,000,000 samples of a
> > chirp going from frequencies 0 to 0.5 (1 being the sampling frequency),
> > surrounded by lots of noise. I want to flatten that chirp at some
> > frequency, so I can bandpass filter it to get rid of the noise.
> >
> > Right now I got a lil problem with understanding negative frequencies
> > and the Hilbert Transform, so that would be cool if we could keep those
> > two concepts out of this topic, if possible. Thanks.
>
> I saw an episode of 60 Minutes one time about fraudulent professional
> schools. One of their producers carried a hidden camera into an
> interview for a position at a nursing school. In the interview, the
> "candidate" confessed to a horrible fear of blood and needles. The
> school administrator smiled and said that would not be a problem!
>
> Back to the subject, though. Please describe what you mean by "flatten
> that chirp at some frequency", and then we might spare you the blood
> and needles, if we can.
>
> John

I meant bring it to -for example- a flat 0.25 frequency sinusoid, or
even at DC

.

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