This java-application calculates the frequency-spectrum of a microphone signal and displays it in real time.
Download the compiled jar-file: SpectrumAnalyzer.jar (16 kByte)
If it does not work, have a look at the source-code SpectrumAnalyzer.java, maybe you have to adjust a parameter. It has been created with BlueJ 3.0.4 (Java version 1.6.0_24) running on Mac OS X 10.6.7
Screenshot (spectrum of a flute):
July 30th, 2012 / Martin Lieberherr