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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

Applications

Feature and Specifications

** In the present implementation 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. A future implementation may use actual A-weighting - but the existing setting still rolls off the high and low frequencies to yeild a result more perceptual than the raw FFT output.

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

Download

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

This version adds STEREO input and fixes a bug with the amplitude for linear vertical scales which was accidentally introduced in version 3.0.


By downloading this file, 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.


Homepage

Created: May 2011
Last modified: 25 Aug 2013

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

©2013 William Andrew Steer
andrew@techmind.org