[sci.electronics] A rather delicate fourier problem AGAIN

etxbrfa@kklm01.ericsson.se (Bjoern Fahller) (09/27/88)

OK guys, I really appriciate your funny answers about what signal processors
are for. That wasn't really what I wanted to get. It seems as the whole
world (except for someone at TEK whos name I've forgotten, has missunderstood
my question (thanks a lot)). The problem is not what kind of device to use.
The problem is the software, the maths behind. And the problem is not to
make a real time FFT (thats not very hard). The problem is the get the Envelope
of a sound's harmonics independent of its frequenzy.

                                                No more quick answers please.

                                                Bjoern

SNAIL: ERICSSON TELECOM         Vox humana: (+46) 8 - 719 62 52
       Bjoern Fahller
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       S-126 25 STOCKHOLM
       SWEDEN

dtynan@sultra.UUCP (Der Tynan) (09/29/88)

In article <1853@erix.ericsson.se>, etxbrfa@kklm01.ericsson.se (Bjoern Fahller) writes:
> The problem is the software, the maths behind. And the problem is not to
> make a real time FFT (thats not very hard).  [...]
                        ^^^^^^^^^^^^^^^^^^^???
Ok, do it!  come back in two years and tell us all about it!!!

Anyway, I have a program written in C that performs FFT's (Singletons
Algorithm, Radix-2, DIT)  It goes up to 8K (A memory limit).  It is fairly
optimized, but basically simulates a piece of hardware, so it's not generic.

If you want it, let me know.  I'll mail you the source.  Failing that of
course, you could build your own 20MHz real-time box in a week or two, right?
						- Der

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