The spectrum analyzer is based on a PIC32 microcontroller which was previously proven in his Oscilloscope project.

On Arduino platforms, this means the display can easily be driven with the popular LiquidCrystal library. The Arduino Nano inside takes in the audio signal via its analog inputs.

LeCroy’s WaveMaster 8 Zi digital oscilloscopes, Agilent’s N9030A PXA spectrum analyzer, and Tektronix's RSA6120A spectrum analyzer are top of the list for test and measurement in 2009. Test ...

These spectrum analyzers convert the input time-domain signals into the frequency domain, where DFT computations extract the details for display, at extremely high rates.