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Re: So ... are you suggesting AD-DA doesn't accurately preserve phase info?

No, I was not suggesting anthing about conversion between analog and digital domains. I was suggesting that perception of monaural phase is not important for human survival, whereas level and frequency are. Binaural phase to some extent but differences in binaural level are useful for indentifing the direction of potential danger.

A classic demonstration is to set the level of a signal that is inphase in both ears so it is just masked by noise. Then flip the phase of the signal in one ear; the signal becomes very audible, and needs to be attentuated as much as 15 dB to again be masked. The magnitude of the effect depends on the frequency, being greatest at lower frequencies. This effect, called the Masking Level Difference (MLD) or sometimes the Binaural Msking level Difference (BMDL), is an intereting psychoacoustic phenomenon that almost always amazes the observer.

db


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  • Re: So ... are you suggesting AD-DA doesn't accurately preserve phase info? - dbphd 16:40:35 02/06/07 (0)


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