I am new to this, and using Audacity 2.0.0. with Windows 7 Home Premium. I would like to record only sounds of a limited frequency (~8 to 10kHz), and have found out how to do that with a playback (from the Effect menu and Equalization), but I need to pick up noises at this specific frequency range and display them in real time.
I am new to this, and using Audacity 2.0.0. with Windows 7 Home Premium. I would like to record only sounds of a limited frequency (~8 to 10kHz), and have found out how to do that with a playback (from the Effect menu and Equalization), but I need to pick up noises at this specific frequency range and display them in real time.<<<
I am deaf and cannot hear the bean-cracking sounds very well during coffee-roasting. These are the triggers for changing temperature of the roast and knowing when to shut it down. From playing back other roaster’s recordings I know the frequency in which I am interested. The set up is a mike plus PC notebook, at the moment with Audacity. A mono display will do the trick and this should be displayable at about one second per half inch. Filtering out the other frequencies is the objective, to provide clarity/certainty. The roaster that I use (Gene Cafe) has a predictable “clang” once every six seconds, and this needs to be distinguished from the bean-cracking noises that are not unlike popcorn popping at one phase and Rice Krispies popping at another.
How ingenious.
As Koz wrote, Audacity does not do real time processing so I doubt that it will be much use for your application.
It may be worth looking at Wavosaur which I think does have real time processing ability http://www.wavosaur.com/
A possible alternative to filtering the input and looking at the amplitude, would be a real time spectrum plot, so it may be worth looking to see if Wavosaur will support Voxengo SPAN http://www.voxengo.com/product/span/
The early QuickTime system had a simple moving spectrum bar graph that jumped as audio was playing, but I think they peeled that off in the latest versions. Koz
I noticed the downloads from “www.phon.ucl.ac.uk” are not working at the moment.
However I found an alternative real-time spectrogram ,
on a free oscilloscope-program called “Visual analyser” ,
[ it’s far more complex than the programs from UCL ]