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FFT Analysis for Dummies
Ethan Winer
post Jan 28 2012, 18:50
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QUOTE (Woodinville @ Jan 28 2012, 05:56) *
.zip fixed.


Great! But what's an ".m" file and how do you open it?

--Ethan


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xnor
post Jan 28 2012, 20:01
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The .m files are scripts for GNU Octave, but you can open them with any text editor.


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Ethan Winer
post Jan 29 2012, 19:09
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QUOTE (xnor @ Jan 28 2012, 14:01) *
The .m files are scripts for GNU Octave, but you can open them with any text editor.


Ah, I see that now. Thanks.


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Woodinville
post Jan 30 2012, 02:59
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So, Ethan, did you run some of the scripts yet?

Note, in order to use the script "crunch" you need to record the "swisha" signal put out through a speaker to a mic, in channel 1, and loopback the DAC to channel two, so you have a stereo signal with the system response in one channel and the stimulus in the second channel. Save this as "foo.wav".

You need to record at least 23 seconds more or less centered on the "swisha" signal.

Make sure you don't clip or anything.

When you have a reference, move "foo.wav" to "bar.wav" and put your new measurements in foo.wav and then run crunch3, and you get to see the differences.


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Ethan Winer
post Jan 30 2012, 18:45
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QUOTE (Woodinville @ Jan 29 2012, 20:59) *
So, Ethan, did you run some of the scripts yet?


No, I don't have any way to do anything useful with those files. By "deck" I thought this was a Power point show I could learn from. ohmy.gif

--Ethan


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Woodinville
post Jan 30 2012, 23:59
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QUOTE (Ethan Winer @ Jan 30 2012, 09:45) *
QUOTE (Woodinville @ Jan 29 2012, 20:59) *
So, Ethan, did you run some of the scripts yet?


No, I don't have any way to do anything useful with those files. By "deck" I thought this was a Power point show I could learn from. ohmy.gif

--Ethan



You can upload octave for free for apple, linux, or windows. So yes, you can get a way to do it.

Ditto audacity.

Ditto gvim.

Then you can design your own scripts.

There are a couple of powerpoint decks, too, of course. But you want to upload octave (instructions at www.aes.org/sections/pnw very soon if not now) and actually play with this stuff.


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Ethan Winer
post Feb 1 2012, 23:14
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Hey, I watched an FFT tutorial "webinar" put on by Prism Sound today, and it was excellent. It was aimed at non-math people like me, and I learned a lot. They said it will be on their web site in about a week for all to see. If anyone cares I'll post a link when it's up.

--Ethan


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Roseval
post Feb 1 2012, 23:56
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QUOTE (Woodinville @ Jan 13 2012, 02:08) *
The irony of this thread being ressurrected is:
http://www.aes.org/sections/pnw/


Oops, where it the FFT power point? The link points to

AES PNW Section
February Meeting Notice


The Future of Mobile Gaming
AND
another gaming topic


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romor
post Feb 2 2012, 02:37
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http://www.aes.org/sections/pnw/scripts/


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Roseval
post Feb 2 2012, 10:14
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Thanks smile.gif



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Woodinville
post Feb 2 2012, 11:02
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QUOTE (Roseval @ Feb 1 2012, 14:56) *
QUOTE (Woodinville @ Jan 13 2012, 02:08) *
The irony of this thread being ressurrected is:
http://www.aes.org/sections/pnw/


Oops, where it the FFT power point? The link points to

AES PNW Section
February Meeting Notice


The Future of Mobile Gaming
AND
another gaming topic



As you have found out, the announcement has moved to the powerpoint directory, or thereabouts.

That's because the meeting is over.


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Speedskater
post Feb 2 2012, 15:31
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Were you able to find anyone to make an audio recording of the seminars ?


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xnor
post Feb 2 2012, 19:37
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QUOTE (Ethan Winer @ Feb 2 2012, 00:14) *
If anyone cares I'll post a link when it's up.

I care. smile.gif


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C.R.Helmrich
post Feb 2 2012, 23:14
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Me too. To many people, such a resource will be more helpful than an .m file and the instruction to download Octave. After all, this thread is called "FFT Analysis for Dummies"...

Chris (thinking of - maybe one day - making an explanatory Youtube video on the DFT)


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Roseval
post Feb 2 2012, 23:36
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QUOTE (C.R.Helmrich @ Feb 2 2012, 23:14) *
Chris (thinking of - maybe one day - making an explanatory Youtube video on the DFT)

Do!


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Woodinville
post Feb 4 2012, 02:48
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QUOTE (Speedskater @ Feb 2 2012, 06:31) *
Were you able to find anyone to make an audio recording of the seminars ?


There are two audio recordings, but I have no idea of their provenance or availability yet.


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Woodinville
post Feb 4 2012, 07:20
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QUOTE (Woodinville @ Feb 3 2012, 17:48) *
QUOTE (Speedskater @ Feb 2 2012, 06:31) *
Were you able to find anyone to make an audio recording of the seminars ?


There are two audio recordings, but I have no idea of their provenance or availability yet.


I'm told I might get a rough copy of the recording over the weekend.


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Woodinville
post Feb 6 2012, 05:52
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http://www.aes.org/sections/pnw/pnwrecaps/2012/jj_jan/

Contains both high and low-rate MP3's of the talk. No video, but audio. ppt decks and scripts available.


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Woodinville
post Feb 6 2012, 06:17
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QUOTE (C.R.Helmrich @ Feb 2 2012, 14:14) *
Me too. To many people, such a resource will be more helpful than an .m file and the instruction to download Octave. After all, this thread is called "FFT Analysis for Dummies"...

Chris (thinking of - maybe one day - making an explanatory Youtube video on the DFT)


So, you can't upload the .ppt decks or something?


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romor
post Feb 8 2012, 09:53
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QUOTE (Woodinville @ Feb 6 2012, 07:17) *
So, you can't upload the .ppt decks or something?

I made cue sheets while listening to fft talk:

part 1: http://pastebin.com/dPS5c0ZJ
part 2: http://pastebin.com/Ag8Hpxw4

Then using it, yesterday I created 720p video slideshow with mencoder and uploaded to youtube - but they didn't accept it as it was too long (I wasn't aware of such restiction)
then on vimeo, but they transcode it, and result wasn't good, so I deleted it

Hope someone finds cue sheets handy happy.gif


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Woodinville
post Feb 9 2012, 03:52
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QUOTE (romor @ Feb 8 2012, 00:53) *
QUOTE (Woodinville @ Feb 6 2012, 07:17) *
So, you can't upload the .ppt decks or something?

I made cue sheets while listening to fft talk:

part 1: http://pastebin.com/dPS5c0ZJ
part 2: http://pastebin.com/Ag8Hpxw4

Then using it, yesterday I created 720p video slideshow with mencoder and uploaded to youtube - but they didn't accept it as it was too long (I wasn't aware of such restiction)
then on vimeo, but they transcode it, and result wasn't good, so I deleted it

Hope someone finds cue sheets handy happy.gif


Thank you, and a pox on those services who won't deal with it!



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Ethan Winer
post Feb 28 2012, 18:38
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QUOTE (Ethan Winer @ Feb 1 2012, 17:14) *
Hey, I watched an FFT tutorial "webinar" put on by Prism Sound today, and it was excellent. It was aimed at non-math people like me, and I learned a lot. They said it will be on their web site in about a week for all to see. If anyone cares I'll post a link when it's up.


The Prism Sound FFT webinar is now available for download:

http://www.prismsound.com/test_measure/web...3&src=SRWmm

You have to tell them who you are, but the query form is not otherwise intrusive. You'll get an email with the real download link after only a minute or two.

--Ethan


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Woodinville
post Mar 1 2012, 01:01
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QUOTE (Ethan Winer @ Feb 28 2012, 09:38) *
QUOTE (Ethan Winer @ Feb 1 2012, 17:14) *
Hey, I watched an FFT tutorial "webinar" put on by Prism Sound today, and it was excellent. It was aimed at non-math people like me, and I learned a lot. They said it will be on their web site in about a week for all to see. If anyone cares I'll post a link when it's up.


The Prism Sound FFT webinar is now available for download:

http://www.prismsound.com/test_measure/web...3&src=SRWmm

You have to tell them who you are, but the query form is not otherwise intrusive. You'll get an email with the real download link after only a minute or two.

--Ethan


No ID required for the recordings and powerpoint decks at www.aes.org/sections/pnw

Free software there, too. Not, as somebody put it "some scripts and advice to upload octave".


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Arnold B. Kruege...
post Mar 1 2012, 14:00
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QUOTE (Ethan Winer @ Feb 28 2012, 12:38) *
QUOTE (Ethan Winer @ Feb 1 2012, 17:14) *
Hey, I watched an FFT tutorial "webinar" put on by Prism Sound today, and it was excellent. It was aimed at non-math people like me, and I learned a lot. They said it will be on their web site in about a week for all to see. If anyone cares I'll post a link when it's up.


The Prism Sound FFT webinar is now available for download:

http://www.prismsound.com/test_measure/web...3&src=SRWmm

You have to tell them who you are, but the query form is not otherwise intrusive. You'll get an email with the real download link after only a minute or two.



Not only that, but the email will allow you to download any or all of their entire library of videos. I've only had time to watch a few minutes of the FFT video, but it looks like a keeper.
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romor
post Mar 1 2012, 15:25
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QUOTE (Woodinville @ Mar 1 2012, 02:01) *
No ID required for the recordings and powerpoint decks at www.aes.org/sections/pnw


I uploaded jj talk video on my dropbox account:

What is FFT (part 1) 56:05 - 37.5 MB
What is FFT (part 2) 47:58 - 32.4 MB

It's in AVI container because of mp3 audio source. I used already provided CUE sheets, and some obvious parts are removed (named with string chars in CUE sheets). Basically this line was used:

CODE
for f in *.mp3
do mencoder mf://${f%.*}.png -mf w=1280:h=720:fps=1/`mp3info -p "%S" $f`:type=png -audiofile $f \
-ovc lavc -lavcopts vcodec=mpeg4 -oac copy -ofps 30000/1001 -o ${f%.*}.avi
done

in Linux box.

If someone thinks that it can be hosted on HA, please uploaded it

Cheers


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