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(11) | EP 2 257 084 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Multipoint adaptive equalization control method and multipoint adaptive equalization control system |
| (57) Provided are a multipoint adaptive equalization control method and system for performing
adaptive equalization control on sound detected at a plurality of control points in
a car cabin. An inverse phase characteristic opposite to a phase characteristic from
a speaker to a main control point is applied to an audio signal output from an audio
source. Error signals respectively indicating the differences between detection signals,
corresponding to a detected sound signal output from the speaker, in the respective
control points and target signals for the control points are output. A gain of an
audio signal is determined by performing adaptive signal processing so that the sum
of powers of the input error signals is minimized. The inverse phase characteristic
and the gain are applied to an audio signal and the resultant audio signal is supplied
to the speaker.
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