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jDFT 2.5 released!!(2007-08-02)
Congratulations to all loudspeaker analyzers! jDFT 2.5 includes a much longed for feature that makes pink noise read flat.
Also, in version 2.3 there was a new feature that makes it possible to use the mouse to zoom in on the frequency axis. Just hold the left mouse button down and select the frequency region that you want to zoom in. You zoom out by clicking with the right button.

There have been some problems with the download server, but it should be working now. Please note that Windows 64-bit is unsupported.

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jDFT is 100% free to use! However, if you want to show your appreciation, you are welcome to donate $10. Simply click the Donate button and you will be redirected to PayPal.

 
Below you can find almost all previous versions, and of course also the latest version, of jDFT. If you want to know the basic features of version 2.1 and how to use them, go to the 'How to use' page.

VersionDistinctive featuresFile (size)
2.5 (2007-08-02)Finally, after comments from several users, a new feature that makes pink noise read flat has been implemented. Just check the "Pink 2 Flat" check box!

Requirements: Windows98 with DirectX 9 installed.
 

jDFT2.5.exe (256 kB)
2.4 (2007-04-24)There was a limit on the length of the observation time in previous versions of jDFT. Actually no matter which combination of sample rate and number of samples you selected, you could never analyze more than 700 ms of audio. In the case the selected combination would exceed this limit, the residual samples were zero-filled. The effect of removing this limit is that you will get a higher frequency resolution in some cases.

Requirements: Windows98 with DirectX 9 installed.
 

jDFT2.4.exe (256 kB)
2.3 (2006-06-27)In this version there is one new feature and a small fix.
The new feature is a function that makes it possible to zoom in on the frequency axis with the mouse. Just select the frequency region that you're interested in with the mouse while holding the left mouse button down.
In 2.2c I had accidently removed the scaling factor for the stop frequency... I won't go in to details but the stop frequency for the frequency span didn't work.

Requirements: Windows98 with DirectX 9 installed.
 

jDFT2.3.exe (256 kB)
2.2c (2006-01-09)In this version there is one new feature and some small cosmetic fixes + some small 'real' fixes (+ a completely new bug that's fixed in 2.3).
The new feature is the much longed-for peak hold feature. Congratulations to all users of jDFT!!
One of the cosmetic fixes is that you now can hit the F1 key to go to this web page. The most important real fix is that the triangular window was never used in earlier versions even though you choosed it. This was because of a missing break; in a switch statement. I'm really sorry about that, but it can happen to anyone and why would anyone use the triangular window anyway ? ;)

Requirements: Windows98 with DirectX 9 installed.
 

jDFT2.2c.exe (256 kB)
2.2 (2005-12-06)There are some major fixes and some small ones in this release. The most important fix is the scaling of the frequency axis, the old version used too much space to plot the low frequencies. But hey, that's fixed now!!
A completely new feature is a dB-grid, it hasn't been thoroughly tested but I guess you could use it to compare two signals. But bear in mind that it's a relative measure, it will change when you change the Volume control in Windows, the scaling, the offset, window function or samples in jDFT.
The rest is the same as 2.1, one small last notice...I've found that the sample rate of my sound board is most accurate at 44.1 kHz, I don't know if this is the case in general but I just wanted to mention it.

Requirements: Windows98 with DirectX 9 installed.
 

jDFT2.2.exe (256 kB)
2.1Too much space for the low frequencies (see above), quite good frequency estimation...enable it by left-double clicking in the freq. spectrum area. I'm using it to tune my guitar :)
Requirements: Windows98 with DirectX 9 installed.
 
jDFT2.1.exe (252 kB)
2.01This is an old version which shows the frequency spectrum as a thin line, I guess it's matter of taste if you prefer this one or the solid bars in vesion 2.1. The difference between 2.01 and 2.0 is that there is a non-scientific way of measuring the power of the audio source in v 2.01. This is accessed by double clicking with the left mouse button twice.
Requirements: Windows98 with DirectX 6 installed.
 
jDFT2.01.exe (258 kB)
2Almost same as 2.01. Choose one of the following files. The only difference is that they are linked in different ways, statically or dynamically.
Requirements: Windows98 with DirectX 6 installed.
 
jDFT2static.exe (256 kB)
jDFT2dyn.exe (39 kB)
2alfaAn early build of version 2, don't use this one. Just provided to make this list longer.
Requirements: Windows98 with DirectX 6 installed.
 
jDFT2alfa.exe (39 kB)
0.9999This is the first version of jDFT, quite difficult to use if you ask me. Provided for historical reasons. If you try this one you should test to enable the 'Toner' check button. This was an early attempt to estimate the pitch of a note, it uses some kind of reduced DFT. It takes some time for this version before it runs smooth, it's just because your computer is too fast!
Requirements: Windows98 with DirectX 6 installed.
 
jDFT.exe (735 kB)

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