Input to Audio Spectrum Analyzer from microphone or wave file. Audio Spectrum Analyzer has variable displays, Fast Fourier Transform (FFT) display, variable sample rates (8000 Hz, 11025 Hz, 22050 Hz, and 44100 Hz), variable transform sizes (1k, 2k, 4k, and 8k), adjustable upper and lower limits, continuous, averaged, and peak hold, selectable foreground and backgrounds, variable markers, option to save a reference plot compare with the foreground plot, time display (oscilloscope), triggered sweep, and waterfall display (color or B/W).

Audio Spectrum Analyzer Features
1. Analyzes audio from 10 Hz to 20 kHz
2. Input from microphone or wave file
3. Variable displays
a. Fast Fourier Transform (FFT) display
* Variable sample rates (8000 Hz, 11025 Hz, 22050 Hz, 44100 Hz)
* Variable transform sizes (1k, 2k, 4k, 8k)
* Upper and lower limits adjustable
* Continuous, averaged, peak hold
* Selectable foreground/backgrounds
* Variable markers (2)
* Save a reference plot, compare with the foreground plot
b.Time display (oscilloscope)
* Triggered sweep
c. Waterfall display (color or B/W)

The license of this software is Freeware, you can free download and free use this audio utility software.