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Spectral Eye

 My KVR
Oscilloscope by Secret Base Design
Spectral Eye
Spectral Eye by Secret Base Design is a Mobile Audio App and a Standalone Application for iOS. It functions as a Standalone Application.
Product
Version
1.0
System Requirements
iPhone 3Gs or better, any iPad, iPod Touch 3rd or 4th generation, iOS 5.0 or newer
Other
Stand-Alone Utility / Application
My KVR - Groups, Versions, & More
5 KVR members have added Spectral Eye to 5 My KVR groups 6 times.
Not In Your MY KVR Groups
(or group limitation prevents versioning)
+3 in private groups

KVR Rank

Overall: 13393   466

30-Day: 9088; 7-Day: 6738; Yesterday: 9848

Spectral Eye analyzes incoming audio signals to extract the underlying frequencies. Most sounds are built up from a variety of sine waves; a simple whistle might be a single wave, while a guitar, piano, or the human voice have many waves added together.

By using a Fast Fourier Transform, sound can be decomposed into each frequency. Normally, this information is displayed on a chart, and there are number of excellent apps that do exactly this. Spectral Eye rearranges the FFT into a spiral, so that frequencies that are an octave apart are lined up as rays from the center of the display. The strength of each frequency is represented by the size of a red circle.

Play music, and Spectral Eye will reveal the frequencies. For a guitar, it's easy to see that in addition to the root frequency of a note, there are also a number of harmonic frequencies -- and these change based on the strings used, the pickups, and the amplification system. It's the frequencies present in the notes that make a Telecaster sound different from a Les Paul, and a piano different from a trumpet. Play an instrument, music from your iTunes library, or have it listen to whatever sounds are nearby -- the display is fun to watch.

If you're interested in understanding the nature of sound, use Spectral Eye to get a better view. The app was created as a utility used in the development in other Secret Base Design apps; we're making it freely available, because we found it to be useful, and thought others might like it too.

The app will remain free, and will not have ads. If you find it useful, we would very much appreciate a review in the app store, and you can get in touch with us through our support site, our Facebook page, or Twitter.

Have fun with the app, and we hope you enjoy opening your Spectral Eye!

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