Global Patent Index - EP 1169884 B1

EP 1169884 B1 2003-06-25 - FLAT SURFACE LOUDSPEAKER AND METHOD FOR OPERATING THE SAME

Title (en)

FLAT SURFACE LOUDSPEAKER AND METHOD FOR OPERATING THE SAME

Title (de)

FLÄCHENLAUTSPRECHER UND VERFAHREN ZU DESSEN BETRIEB

Title (fr)

HAUT-PARLEUR PLAN ET SON PROCEDE DE PRODUCTION

Publication

EP 1169884 B1 (DE)

Application

EP 99960797 A

Priority

  • DE 9903377 W
  • DE 19917584 A

Abstract (en)

[origin: DE19917584A1] At least one coil (3,4) are arranged on a plate-shaped surface (2) of predefined material properties, and are electrically excited by a sound source (7). The acoustic frequency response of the loudspeaker is measured and its response curve determined. The inverse of the response curve is determined and approximated by the transfer function of a filter circuit (8). In operation, the filter circuit is connected between the sound source and the loudspeaker, and its transfer function used to compensate for the frequency response of the flat panel loudspeaker. The filter may be a finite impulse response digital filter.

IPC 1-7 (main, further and additional classification)

H04R 7/04; H04R 3/04; H04R 29/00

IPC 8 full level (invention and additional information)

H04R 1/22 (2006.01); H04R 3/04 (2006.01); H04R 7/04 (2006.01); H04R 29/00 (2006.01)

CPC (invention and additional information)

H04R 29/001 (2013.01); H04R 3/04 (2013.01); H04R 7/04 (2013.01); H04R 7/045 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

DE 19917584 A1 20001026; AT 243910 T 20030715; AU 1768700 A 20001102; AU 767985 B2 20031127; DK 1169884 T3 20031020; EP 1169884 A1 20020109; EP 1169884 B1 20030625; JP 2002542745 A 20021210; WO 0064217 A1 20001026

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