(19)
(11) EP 1 453 349 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.04.2009 Bulletin 2009/18

(43) Date of publication A2:
01.09.2004 Bulletin 2004/36

(21) Application number: 04450034.6

(22) Date of filing: 18.02.2004
(51) International Patent Classification (IPC): 
H04R 3/00(2006.01)
H04R 29/00(2006.01)
 H04R 1/40(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 25.02.2003 EP 03450050

(71) Applicant: AKG Acoustics GmbH
1230 Wien (AT)

(72) Inventor:
  • Opitz, Martin
    1190 Wien (AT)

(74) Representative: Patentanwälte BARGER, PISO & PARTNER 
P.O. Box 96
1015 Wien
1015 Wien (AT)

   


(54) Self-calibration of a microphone array


(57) The invention relates to an array microphone with several individual microphones (1-4) connected with a signal processor (11) that for each individual microphone, comprises at least one digital filter, in particular for voice recognition.
The invention is characterized in that at least one loudspeaker (5) is provided, which is arranged in the acquisition area of each of the individual microphones (1-4), in that an electronic circuit is provided, which applies a signal to the loudspeaker (5) in such a manner that it emits a predetermined periodic noise signal, and in that the signal processor (11) evaluates the response signals coming from each of the microphones and/or from each of the digital filters as a response to the reception of the periodic noise signal.







Search report