| (19) |
 |
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(11) |
EP 0 772 374 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
29.03.2006 Bulletin 2006/13 |
| (43) |
Date of publication A2: |
|
07.05.1997 Bulletin 1997/19 |
| (22) |
Date of filing: 29.10.1996 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
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DE DK FR GB |
| (30) |
Priority: |
02.11.1995 DK 112495
|
| (71) |
Applicant: BANG & OLUFSEN A/S |
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7600 Struer (DK) |
|
| (72) |
Inventor: |
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- Pedersen, Jan Abildgaard
Prof. Holstlaan 6,
5656 AA Eindhoven (NL)
|
| (74) |
Representative: Groenendaal, Antonius W. M. |
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Philips
Intellectual Property & Standards
P.O. Box 220
5600 AE Eindhoven
5600 AE Eindhoven (NL) |
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| |
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| (54) |
Method and apparatus for controlling the performance of a loudspeaker in a room |
(57) A method for controlling the performance of a loudspeaker in a room, by determining
in a first acoustic environment suitable parameters defining a first complex transfer
function based on a measurement of the resultant movement of a loudspeaker driver
diaphragm and the associated force, arising from the sound field in the room, acting
on it, and in a second acoustic environment the same or different parameters of a
second complex transfer function by measuring the loudspeaker driver relating to the
room. The ratio between the real parts of the first and second transfer functions
is used to define the performance of a correcting filter, included in the signal chain
to the loudspeaker driver.