BART P BILLINGS
Psychologist in Carlsbad, CA
License number
Pennsylvania PS003747L
Category
Psychology
Type
Psychologist
Address
Address
2
Carlsbad, CA 92009
Pennsylvania
Pennsylvania
Personal information
See more information about BART P BILLINGS at radaris.comName
Address
Phone
2704 Cazadero Dr, Carlsbad, CA 92009
1385 Atlantic City Ave 471263B012, Grover Beach, CA 93433
2389 Mcbride Ln, Santa Rosa, CA 95403
6432 Flamenco St, Carlsbad, CA 92009
1715 La Flora Dr, San Marcos, CA 92069
Professional information
Hemispherical Speaker System
US Patent:
5889876, Mar 30, 1999
Filed:
May 1, 1997
Appl. No.:
8/847021
Inventors:
Bart P. Billings - Carlsbad CA
International Classification:
H04R 2500
US Classification:
381342
Abstract:
A speaker system of a plurality of speakers in a hemispherically directed array, includes a housing having a front, a back and a chamber, the back defined by a plane, and the front defined by a plurality of horns, each horn having a hyperboloid configuration and equally spaced around and from one another in a hemispherical array and directed outward from a common point on the plane, and each of the horns having an apex and a focal point, and a transducer of a first frequency range mounted at the apex thereof. An alternative includes a transducer of a higher frequency mounted at the focal point thereof.