(19)
(11) EP 1 123 634 A1

(12)

(43) Date of publication:
16.08.2001 Bulletin 2001/33

(21) Application number: 99946657.6

(22) Date of filing: 26.08.1999
(51) International Patent Classification (IPC)7H04R 3/00, H04R 25/00
(86) International application number:
PCT/US9919/580
(87) International publication number:
WO 0018/182 (30.03.2000 Gazette 2000/13)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 24.09.1998 US 159442

(71) Applicant: American Technology Corporation
San Diego, CA 92128 (US)

(72) Inventors:
  • SELFRIDGE, Alan, Robert
    Los Gatos, CA 95030 (US)
  • KHURI-YAKUB, Pierre
    Palo Alto, CA (US)
  • NORRIS, Elwood, G.
    Poway, CA 92064 (US)
  • CROFT, James, J., III
    Poway, CA 92064 (US)

(74) Representative: Wombwell, Francis et al
Potts, Kerr & Co.15, Hamilton Square
BirkenheadMerseyside L41 6BR
BirkenheadMerseyside L41 6BR (GB)

   


(54) PARAMETRIC LOUDSPEAKER WITH ELECTRO-ACOUSTICAL DIAPHRAGM TRANSDUCER