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Re: RTA question

Try "Raven", a bioacoustic sound analysis tool written in JAVA. It
incorporates RTA waveform, spectrum and spectrogram analysis.
You can get a demo version at http://www.birds.cornell.edu/brp/.

At 04:15 PM 8/5/2004 +1000, Sam Ferguson wrote:

For protools plugins,  Waves PAZ Analyzer is another option, and Metric
Halo's Spectrafoo is another. They cost $$$ though, but that's protools. I
find PAZ analyzer pretty useless unfortunately, as it is a victim of bad
visualisation design. The implication is that the analyser is showing you
a hi-res fft style analysis, when there are actually only 68 bands
analysed. The display doesn't show a bunch of bars as a b&K analyser
would, but discrete points joined by a line. the problem is the line that
joins these discrete points is the dominant visual effect, but is
meaningless in terms of the analysis performed. Thus it is very difficult
to see whether a peak is actually a peak.

Also, I think a time series, rather than a real-time approach, is a better
idea for locating problems like those you've outlined. These systems
provide other problems though, primarily of the distortion of scale in
colour mapped amplitude representations.

Haven't tried spectrafoo, it seems full of different little meters and is
probably better. It definitely has a time series mode as well as a good
fourier rta. it's fairly popular it seems.

Audition is good, and the spectrogram and analysis tools are impressive.
It seems best set up for two-track stuff though. i find editing painful in
audition, but analysis is just as impossible in protools currently.

In terms of other suggestions, if you have a very narrow band pass filter
you can use it to amplify a very narrow bandwidth by say 24 dB, then scan
across the freuqency range to find the frequency you are concerned with,
then reverse the band pass filter to a bandstop filter and that sound will
be filtered out.

Hope this helps.

On Tue, 3 Aug 2004 22:02:20 +0200, Pawel Kusmierek
<p.kusmierek@NENCKI.GOV.PL> wrote:

Assuming that RTA means Real Time Analyzer, SpectroGram is a good one and
is free for 10 days ($45 later)

BTW, in future you might consider using Adobe Audition rather than
ProTools.  Audition has a built-in analyzer (spectrogram display, spectrum
display, real-time spectrum).

Topher Farrell said:
I'm in the middle of editing sound for a film using Pro Tools and there
are a few resonating frequencies that appear in the audio, I'm trying to
notch them out, but I need an RTA that I can use side by side with Pro
Tools. Does anyone know of one that I can download from somewhere? Or
possibly have another suggestion? Thanks!

Pawel Kusmierek
Nencki Institute of Experimental Biology
ul. Pasteura 3
02-093 Warsaw, Poland
phone: (+48 22) 58 92 388
fax: (+48 22) 822 53 42
email: p.kusmierek@nencki.gov.pl