Patent ID: 7239439
Filing Date: 2007-07-03
Classification: H04B

Abstract:
1. A communication apparatus comprising: a light source for projecting a beam of light; a beam expanding lens for expanding said beam of light into an expanded beam of light; a collimating lens for collimating said expanded beam of light into a column of collimated light; a plurality of acoustic transducers for projecting acoustic emanations in a direction that is substantially perpendicular to said column of collimated light, each of said acoustic transducers being positioned in a preselected location with respect to said column of collimated light so that each said acoustic transducer affects a different region of said column of collimated light for making a modulated signal; a collecting lens for collecting said collimated light from said collimating lens and light as affected by said acoustic emanations, said collecting lens focusing said collected collimated light at a focal region; an optical filter at said focal region for filtering said collected light to separate light as affected by said acoustic transducers from light not so affected; and a detector for detecting said light as affected by said acoustic emanations, said detector including an array of individual detection elements that are positioned to coincide with said different regions of said column of collimated light.