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Topic: ** DIGITAL FILTER Source Code ... HELP EINSTEINs' **
Replies: 8   Last Post: Aug 8, 1996 12:08 PM

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j.w. jergaw

Posts: 4
Registered: 12/7/04
** DIGITAL FILTER Source Code ... HELP EINSTEINs' **
Posted: Jul 30, 1996 1:53 AM
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I really don't know who else to ask or where else to look.

I REALLY REALLY need source code for: time-domain/frequency-domain
DIGITAL FILTER.
I have scanned the NET, looked through some books, but all have produced
no source code I can use. I want code which can except the NEW frequency
magnitude (any frequency/frequencies) and begin filtering the digital
sound data to RECREATE the new digital sound data reflecting "exactly"
the desired new frequency magnitude.

What I am doing is taking in 16-bit digital sound data, applying an FFT
to it to get the sound's frequency spectrum (power spectrum). What I
want to do with this "spectrograph" display is to EDIT the magnitudes to
my liking (any frequency to any magnitude). Once I have the desired
looking spectrograph, I apply an Inverse FFT on the spectrograph to get
the NEW 16-bit digital sound data. The only thing is, I've heard that if
I want to do this, I MUST USE a digital filter and to not directly edit
the magnitudes and do Inverse FFT. So to get a proper 16-bit digital
output data, I must go INPUT 16-bit digital data --> FFT --> We get
SPECTROGRAPH --> Edit spectrograph to liking --> Apply Inverse FFT to
NEW spectrograph --> We finally get NEW 16-bit digital data.

Please, if you have code which can do this for me or know where to obtain
such code, I would love to get a hold of it from you! Any help you can
provide would be GREATLY APPRECIATED!!

Jimmy.





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