Subject: Re: Gaussian vs uniform noise audibility From: Israel Nelken <israel(at)MD.HUJI.AC.IL> Date: Tue, 27 Jan 2004 11:34:18 +0200Dear Bob, What do you mean by: > I tested Gaussian white noise with standard deviations of > 2.0, 1.0, 0.5, and 0.1, compared to uniform white noise. > Noise sources were continuous and non-repeating. I found > that in all cases except for SD = 0.1 the levels could > be adjusted to give the percept of a single continuous > source. > I ran informally similar tests (using matlab), with similar results. A uniform distribution between 0 and 1 has an std of 1/sqrt(12), or about 0.3, so it should fit a gaussian with the same std. It is unclear what was the uniform distribution that you used, but this type of calculations should be able to reproduce your results. I don't understand your 0.1 case, though. Reducing the std should not change the shape of the distribution, and should be equivalent to changing the volume control (since the square of the std is the energy of the sound). This should not change the perception! Eli -- ================================================================== Israel Nelken Dept. of Neurobiology The Alexander Silberman Institute of Life Sciences Edmond Safra Campus, Givat Ram | Tel: Int-972-2-6584229 Hebrew University | Fax: Int-972-2-6586077 Jerusalem 91904, ISRAEL | Email: israel(at)md.huji.ac.il ==================================================================