Comments on: A 5K Java Guitar Tuner

By: Robin van Emden

Robin van Emden — Sun, 09 Oct 2011 17:33:20 +0000

Hi John,
Thank you for making the source code available! Needed an AS3 version and was able to convert your Java tuner into Flash Actionscript without much difficulty:
http://prlwytzkofsky.com/online-as3-guitar-tuner/

By: Online AS3 Guitar Tuner « Prlwytzkofsky

Online AS3 Guitar Tuner « Prlwytzkofsky — Sun, 09 Oct 2011 17:10:04 +0000

[...] example code for an online Guitar Tuner, I came upon the very efficient Java 5Ktuner on Psychic Origami. All I had to do was convert it to Actionscript. The Flash AS3 version works great – thanks [...]

By: john

john — Wed, 17 Mar 2010 10:34:19 +0000

Hi Josh,

there’s some license info over here to look at:

http://www.psychicorigami.com/license/

Basically yep, you can use it, just make sure you give me some attribution.

You may find though, that you will need to use the Fast-Fourier Transform to get your app working efficiently. However the correlation technique in my code will at least let you get started.

cheers,

John

By: Josh

Josh — Tue, 16 Mar 2010 16:45:56 +0000

Hi John,
I found your code to this and found it to be extremely helpful for a project I am doing for a class. My project is a game-like program that will listen to guitar input and compare it to what is supposed to be played. Could I have permission to use your code and do you have any ideas on my project?

Thanks!

By: john

john — Wed, 10 Feb 2010 09:47:52 +0000

Hi James,

I just manually compiled it using javac, then ran it through the jar command. There’s a build.sh script with with source code for compiling it – which I think contains an obfuscation step too.

In principle you could adapt this to work on mobile – assuming you can access the microphone. However this really isn’t a very efficient way of pitch detection. For that you probably need to look at something like the “Fast Fourier Transform”, but that’s quite a bit more complex.

John

By: James Murphy

James Murphy — Wed, 10 Feb 2010 09:40:09 +0000

I’m new to java, what did you use to compile the jar program?
Also would this work on a mobile, this is my eventual aim.

Thanks

By: Kadir

Kadir — Sun, 17 Jan 2010 20:55:58 +0000

Hi John,

thanks. i am ashamed of myself to have not seen that one

By: john

john — Sun, 17 Jan 2010 17:39:09 +0000

Hi Kadir,

there is an artificial delay that I introduced to stop the app chewing up 100% CPU, so maybe start by removing/reducing that. Look at line 241 in GT.java and you should see a call to Thread.sleep() being passed a value of 250ms (quarter of a second).

John

By: Kadir

Kadir — Sun, 17 Jan 2010 15:38:58 +0000

Hi John,

i am doing a project for my studies and i needed some code to get the frequency out of the mic. so i found your tuner which helped me a lot, but there’s one little thing i have to get rid of though: theres always a delay of about half a second. could you tell me how i could do that. i can send you my project if it helps. thanks in advance

By: john

john — Mon, 30 Nov 2009 20:24:21 +0000

@corly – I wouldn’t worry about the size too much. Your tuner seemed to load up fast enough. Though, as yours is in Flash you’ll need to wait for the latest version to come out. At the moment the current version can’t access the microphone, but that’s set to change with the new version.