On Fri, Sep 28, 2012 at 03:27:39PM +0200, Florian Paul Schmidt wrote: > On Friday, September 28, 2012 09:15:21 AM Rick Green wrote: > > A friend has discovered some historical recordings of his Grandfather in > > the Smithsonian's collection, and would like us to clean them up a bit for > > publication. One of the issues is that the triangle player is often off > > the beat with the rest of the band, and he would like us to push the > > triangle to the back of the mix. > > Is there a plugin something like a compressor coupled to a notch or comb > > filter that I could use to suppress the sound of the triangle within a > > recording of a Cajun band? > > Hi, > > sadly it's not sooo simple to supress a single instrument from a mix. A > triangle is pretty narrowbanded though, so one could maybe get away with a > narrow notch filter. But the more problematic part is the attack phase of the > triangle. It is rather wide spectrum (compared to the tail) and sadly the > attack phase is what defines its rhythm. > > Maybe there's research out there though. If you had a model of the triangle > sound there might be ways of a] detecting where a triangle note is played and > b] basically subtract the model prediction from the audio signal at that > point.. > > Have fun, > > Flo I agree with the above. I'll just add that it depends also a great deal on what else is in the recording. Perhaps masking or compressing the triangle wouldn't impede that much on other instruments, depending what they are: if you've got a fiddle, you're pretty much out of luck. Anyway, as to your main question, there are plenty of tools, if only you can identify the frequency: multiband compression and parallel procesing both come to mind. Cheers, S.M. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
