Filtering frequency during recording
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This forum is for Audacity on Windows.Please state which version of Windows you are using,
and the exact three-section version number of Audacity from "Help menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.
Filtering frequency during recording
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.
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kozikowski
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Re: Filtering frequency during recording
Audacity doesn't do anything in real time past record, play, and some timer functions. No filtering and no effects. It's a future product request.
Koz
Koz
Re: Filtering frequency during recording
Can anyone recommend software that will do what I want? Preferably freeware, but that may be pushing it. 
Re: Filtering frequency during recording
What's it for? How exactly do you need it displayed?
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
Re: Filtering frequency during recording
>>>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.
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.
Re: Filtering frequency during recording
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/
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/
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
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kozikowski
- Forum Staff
- Posts: 69374
- Joined: Thu Aug 02, 2007 5:57 pm
- Operating System: macOS 10.13 High Sierra
Re: Filtering frequency during recording
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
Re: Filtering frequency during recording
I can suggest google terms ...
https://encrypted.google.com/search?q=r ... m+freeware
I've just tried this one on Windows Vista ...
http://www.phon.ucl.ac.uk/resource/sfs/rtgram/ (it records the sound too)
The maximum time interval which can be displayed on the screen is only 15 seconds,
which may be too short for your coffee experiment.
https://encrypted.google.com/search?q=r ... m+freeware
I've just tried this one on Windows Vista ...
- real-time spectrogram (''rtgram'').png (67.05 KiB) Viewed 1747 times
The maximum time interval which can be displayed on the screen is only 15 seconds,
which may be too short for your coffee experiment.
- Attachments
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- Full size screen, Dotted lines at 1KHz intervals.zip
- (172.07 KiB) Downloaded 83 times
Re: Filtering frequency during recording
wow, UCL have got plenty more free audio visualization software ... http://www.phon.ucl.ac.uk/resource/software.php