From:	David Woods <david@*******.FREESERVE.CO.UK>
Subject:	Re: Ultrasound vision
Date:	Wed, 3 Feb 1999 20:03:28 +0000

Marc Renouf wrote:
>
> The "acoustic daylight" stuff is cool, but represents a pretty
> serious computational burden. First off, you're looking at sound over a
> variety of frequencies, some of which attenuate quickly, some of which do
> not. The other problem you have is binocular localization. You need an
> array of sensors to be able to determine directionality of the background
> noise.

Directionality. Good point. I seem to recall this being a the main
thrust of a related post a while back.

> Tiny microphones are all well and good, but there are problems
> giving them enough directional focus to be able to accurately determine
> direction (especially at distance).

How is this achieved?

Would that be done with the acoustic equivalent of a lens, parabolic
mirror or something else?

> Granted, packing a lot of them
> together helps, but you still have problems.

Even with "linear algebra transmission matrices"...

Regards

- David Woods