Gnaural: An Opensource Programmable Auditory Binaural-Beat Generator

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Gnaural is an opensource programmable auditory binaural-beat generator, implementing the principle as described in the October 1973 Scientific American article “Auditory Beats in the Brain” by Gerald Oster. The central theme of Oster’s article was that processing of binaural beats involves different neural pathways than conventional hearing. Research inspired by the article went on to show that among other things, binaural beats could be used to induce a “frequency-following response” (FFR) in brainwave activity. An early version of Gnaural called WinAural was even used for at least one such published study, “The Induced Rhythmic Oscillations of Neural Activity in the Human Brain“, D. Cvetkovic, D. Djuwari, I. Cosic (Australia), from Proceeding (417) Biomedical Engineering – 2004.”

Voxengo SPAN: Audio Spectrum Analyzer-Freeware Plugin Cross Platform

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“SPAN is a real-timefast Fourier transform” audio spectrum analyzer plug-in for professional music and audio production applications.  For the most part it was derived from Voxengo GlissEQ dynamic parametric equalizer and reproduces its spectrum analysis functionality.

SPAN provides you with a very flexible “mode” system which you can use to setup your sound analysis preferences.  You may specify Fourier block size in samples, FFT window overlap percentage, spectrum’s visual slope.  Beside that you can choose to display secondary spectrum of a desired type (e.g. real-time maximum, all-time maximum).  Spectrum can be visually smoothed out for an easier examination.

SPAN supports multi-channel analysis and can be set to display spectrums from two different channels or channel groups at the same time.  Spectrum’s color can be chosen to taste.

SPAN also features output level metering with adjustable ballistics and integration time, K-metering (including calibration K-metering).  SPAN displays level metering statistics, headroom estimation and clipping detection.  Correlation metering is available as well.