fourier

Fourier does a realtime frequency analysis of recorded sound data and displays it on screen.

The sampling rate is 44100 and it uses 256 samples to calculate the transform. The output is done in a sliding window fashion.

Version	1.1	Status	Developement
Developer	Christian Reitwiessner	Category	Audio
Instructions	No Information	Homepage	http://www.reitwiessner.de/openmoko/fourier.html

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opkg install libsdl-1.2-0 http://www.angstrom-distribution.org/feeds/2007/ipk/glibc/armv4t/base/libfftw3-3_3.1.2-r1_armv4t.ipk http://www.reitwiessner.de/openmoko/fourier_1.1_arm.ipk

Rating: 3

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Known dependencies

libsdl-1.2-0 , libfftw3

Comments

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petruss wrote: (2008-11-04 10:23:24)

you also need
http://www.reitwiessner.de/openmoko/libfftw3-3_3.1.2-r1_armv4t.ipk

nick wrote: (2008-12-10 00:57:09)

from the om wiki for 'fourier':

"if you only get a black screen with the white update line running down, it is very likely that the mixer is not setup correctly to use the built-in microphone of the FreeRunner. In this case, you can try to load capturehandset.state via alsa (alsactl -f capturehandset.state restore). It is possible that you already have the file on your device. "

mine was:
alsa -f /usr/share/openmoko/scenarios/capturehandset.state restore

the 'realtime' bit took a minute or so to catch up to actual realtime but once that started all was good :)

Christian Reitwießner wrote: (2009-02-19 17:23:43)

version 1.1 of fourier now loads the correct alsa state file automatically (from /etc/fourier/fourier.pstate) and also restores the previous state. Have fun!

noother wrote: (2009-01-05 09:02:06)

download is broken (not found)

Christian Reitwießner wrote: (2009-01-05 15:54:01)

Thanks for the note, I have set an external link that works.

imitation wrote: (2009-01-21 17:58:38)

Great app, worked out of the box with the above command.
Takes a while (20sec) to get realtime, meaning the image will be one cyle behind the audio in the beginning.

nice wrote: (2009-03-21 19:12:18)

please add the source

GarthPS wrote: (2009-03-26 10:00:25)

Doesn not worke for me on SHR unstable!
with line only- alsa-state-error

GarthPS wrote: (2009-03-26 10:01:13)

white ..

GarthPS wrote: (2009-03-26 11:29:11)

Does not work even with an alsactl ...

demien wrote: (2009-03-30 17:18:27)

does not work under SHR, just a blank screen with a scrolling bar.

Christian Reitwießner wrote: (2009-04-19 01:43:15)

Sorry for not responding for a while. I had a look at the "does not work" issue. It seems that the mixer file distributed with fourier does not work anymore.

Fix: Download http://wildsau.enemy.org/~moko/voice-recording.state and copy it to /etc/fourier/fourier.state. I would be glad if someone could tell me how to further raise the capture volume.

nice: The source is available at the homepage.

jerjozwik wrote: (2009-05-13 07:24:28)

installs fine on shr-testing 20090502 only it pulls up a white screen of death.

after installing petruss recommended lib the program actually opens. after that it is an uncloseable black screen.

frif wrote: (2009-05-15 12:04:04)

SHR testing: installs OK but I get the black screen with the white update line running down.

If I replace the fourier.state with http://wildsau.enemy.org/~moko/voice-recording.state then I get a black screen, and the program can be closed

frif wrote: (2009-05-15 12:18:31)

I meant it can\'t be closed. Not even with kill -9. I had to reboot the moko.

I tried cp /usr/share/openmoko/scenarios/capturehandset.state /etc/fourier/fourier.state but that didn\'t work either (again program crashes and can\'t be killed)

I don\'t know what else to try :(

c_c wrote: (2009-05-23 05:57:15)

Try voip-handset.state. voice-recording.state has problems.

buergi wrote: (2009-08-24 02:06:53)

same problem as frif here.
at first i got the white line described above. than i downloaded Christian Reitwießner's state file, tried it again than it crashed with a error message and was unkillable.

but the screenshot looks quite impressive

Christian wrote: (2009-09-04 21:43:56)

As c_c said, voip-handset.state should work quite good. Still there are strange issues. I tried to use the alsa libraries and that caused kernel panics quite reliably...