Global Patent Index - EP 1243161 A1

EP 1243161 A1 2002-09-25 - ADAPTIVE METHOD FOR DETECTING PARAMETERS OF LOUDSPEAKERS

Title (en)

ADAPTIVE METHOD FOR DETECTING PARAMETERS OF LOUDSPEAKERS

Title (de)

ADAPTIVES VERFAHREN ZUR BESTIMMUNG VON LAUTSPRECHERPARAMETERN

Title (fr)

PROCEDE ADAPTATIF POUR LA DETERMINATION DE PARAMETRES DE HAUT-PARLEURS

Publication

EP 1243161 A1 (DE)

Application

EP 00991094 A

Priority

  • DE 0004511 W
  • DE 19960979 A

Abstract (en)

[origin: WO0145459A2] The inventive method enables to detect parameters of loudspeakers during real operation by measuring the current (im) of the speech coil and contains the following steps: 1) Measuring the current (im) of the speech coil, whereby said current occurs when the loudspeaker is excited by means of a known input signal (ue). 2) Simulatively estimating the current of the speech coil for the same input signal by means of an equivalent electric network and a time-discrete model that is derived therefrom by means of wave digital realisation. 3) Modifying the parameters in the loudspeaker model by previously detecting start values and minimising the average square error of the measured and simulated current of the speech coil using a gradient method. The equivalent network contains a series connection of two transmitters. The first transmitter is provided with an inductor (Ls) on the secondary side and the second transmitter is provided with the parallel connection of a resistor <i>(1/r)</i> pertaining to a capacitor <i>(M)</i> and a third transmitter on the secondary side.

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

H04R 3/00

IPC 8 full level (invention and additional information)

G10K 15/00 (2006.01); H04R 29/00 (2006.01)

CPC (invention and additional information)

H04R 29/003 (2013.01)

Citation (search report)

See references of WO 0145459A3

Designated contracting state (EPC)

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

EPO simple patent family

WO 0145459 A2 20010621; WO 0145459 A3 20020926; DE 19960979 A1 20010705; EP 1243161 A1 20020925; JP 2003524952 A 20030819; US 2003142832 A1 20030731

INPADOC legal status


2010-12-22 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20100701

2004-05-12 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20040329

2002-11-13 [D17D] PUBLICATION OF THE DEFERRED SEARCH REPORT (DELETED)

2002-09-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020717

2002-09-25 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-09-25 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI