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by W.A. Steer  PhD

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Audio Spectrum Analyser

This page describes a free audio spectrum analyser which you can download. It uses fast Fourier transform (FFT) to give a real-time ('live') spectrum display on your screen.

Screenshot of spectrum analysis applet


Feature and Specifications

In older versions the perceptual "A-weighted" is not actually A-weighted, but is modified by the hearing threshold according to Terhardt - see http://www.diracdelta.co.uk/science/source/t/h/threshold%20of%20hearing/source.html. Versions 3.8 onwards use actual A-weighting.

Features not yet implemented, but under consideration (roughly in order of likely implementation)


Download: SpecAn_3v97c.exe (564kB) latest version 3.97c - 16 July 2016.

New in this version: improvements to ability to export numerical data (time-average FFT) to clipboard, new third-octave band analysis, Mel-band analysis, and other minor tweaks.

Older/archive versions

Download: SpecAn_3v93.exe (553kB) previous version 3.93 - 29 April 2016.

Download: SpecAn_3v91.exe (550kB) older version 3.91 - 29 August 2015.

Download: SpecAn_3v5.exe (532kB) much older version 3.5 - August 2013.

By downloading any of these files, you consent to the standard disclaimer.

This applet doesn't require any installation, won't touch your Windows Registry, and won't install any DLLs. Just download the .EXE and run it. There's no bundled adware or unwanted toolbars. It'll even run straight off a USB memory stick if you want.


Created: May 2011
Last modified: 1 Aug 2016

Source: http://www.techmind.org/audio/specanaly.html

©2016 William Andrew Steer