Re: FFT class or routines
- From: "Maarten Wiltink" <maarten@xxxxxxxxxxxxxxxxxx>
- Date: Thu, 29 Sep 2005 17:13:14 +0200
"Marc Rohloff" <marcrohloff_ng@xxxxxxxxxxx> wrote in message
news:1127996569.274893.86650@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> MeMyselfAndI wrote:
>> I want to do an FFT analysis of audio data in a professional music
>> production app. I've been trying to use a class called RealFFT, but
>> I don't have the technical knowhow to peice the audio back together
>> after the IFFT. I was wondering if there is some Delphi code of some
>> component out there which will make it easy to get the frequency
>> info and then convert that back into PCM.
>
> What are you trying to do after doing a FFT transform? You don't
> normally use these results to play over the sound card but to
> display in some other form, such as an Eq type display.
A traditional equaliser is an active component. FFTs are also useful
for pitch correction or bandpass filters, and undoubtedly many more
things. Anything that is more naturally described in the frequency
domain is a candidate. This isn't surprising at all, because this is
what the Fourier Transform _does_: transform between the time and
frequency domains.
Groetjes,
Maarten Wiltink
.
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