Subject: Re: [linux-audio-dev] 3D fft analysis program
From: Ge Wang (gewang_AT_cs.princeton.edu)
Date: Sun Oct 17 2004 - 14:41:18 EEST
Dear All,
I am new to the list, though not to audio or linux. glad to be here.
We have a version of what you describe that we (Perry Cook,
Ananya Misra, and myself) implemented at the soundlab. Just
released it under GPL. It does full-framerate 3-d waterfall plot
of STFT plus some features. Please let us know if it is what you
like:
http://soundlab.cs.princeton.edu/software/sndpeek/
It is implemented using OpenGL and Perry/Gary's STK/RtAudio.
sndpeek is part of a greater set of real-time audio applets - others
are releasing soon. It runs on linux (jack/alsa/oss), os x, and win32.
While we are at it - we are also working on a real-time, concurrent
audio programming language:
http://chuck.cs.princeton.edu/
Alright.
Best,
Ge!
On Oct 17, 2004, at 6:13 AM, michael tewner wrote:
> I'm currently doing this in TCL/TK. I started using the snack audio
> library which (anong other things) makes spectrograms. I give it
> consecutive chunks of audio and have it redraw to the canvas every n
> milliseconds. I think it's having trouble keepingup, and it only knows
> how
> to do 2d plots.
>
> I'm considering doing the processing beforehand (ie, on load) and
> storing
> the entire time-domain fft into a matrix, then using a graphics library
> (plot3d) to graph it in real time... unless I can figure outhow to
> multithread the program to allow one function to read ahead while the
> other graphs it.
>
> Anyway, I've never programed tcl/tk before, but I'm trying to get this
> done before january.
>
> -tewner
>
>> On Sun, 3 Oct 2004, Dave Phillips wrote:
>>
>>> HiAndres:
>>>
>>> At last, someone's going to try it ! :)
>>>
>>> I'm hoping that you're thinking of a realtime display, in which the
>>> peaks roll off to create a true waterfall effect.
>>>
>>> Stanko Juzbasic has tried to port Alan Peever's Spectrogram from SGI
>>> machines to Linux, but I've not been able to get his sources built
>>> on my
>>> systems.
>>>
>>> Please keep me informed about your progress, I've wanted such a
>>> program for many years.
>>>
>>> Best regards,
>>>
>>> dp
>>>
>>>
>>>
>>> Andres Cabrera wrote:
>>>
>>>> Hi all,
>>>> I am planning to develop a 3d fft display (sometimes called cascade
>>>> display), since I haven't found an application that does that in
>>>> linux.
>>>> Does anyone know if such an application exists or is in the works?
>>>>
>>>> Cheers,
>>>> Andr?s
>>>>
>>>>
>>>
>>>
>>>
>>
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