Re: RTA question ("Christopher W. Clark" )


Subject: Re: RTA question
From:    "Christopher W. Clark"  <cwc2(at)CORNELL.EDU>
Date:    Sun, 29 Aug 2004 21:20:40 -0400

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: >Hi > >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. >http://www.mhlabs.com/metric_halo/products/foo/ > >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. >Sam > > > >On Tue, 3 Aug 2004 22:02:20 +0200, Pawel Kusmierek ><p.kusmierek(at)NENCKI.GOV.PL> wrote: > >>Assuming that RTA means Real Time Analyzer, SpectroGram is a good one and >>is free for 10 days ($45 later) >>http://www.visualizationsoftware.com/gram/gramdl.html >> >>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(at)nencki.gov.pl >>


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