| 摘要 |
PROBLEM TO BE SOLVED: To provide an adaptive filter calculation method and a sound field generating device, capable of appropriately reproducing sound. SOLUTION: In the sound field generating device 10, for an inverse system including an adaptive filter having an inverse characteristic of a reproduction sound field characteristic that is a sound field characteristic of an environment where a sound source of an input signal is reproduced, and arranged in series with a stage previous to an output stage of the reproduction sound field characteristic, and an auxiliary filter for updating the adaptive filter arranged in parallel with an output stage of an arbitrary sound field characteristic, the auxiliary filter is identified based on the arbitrary sound field characteristic as a target using the adaptive filter with an initial value set therein or the adaptive filter having been updated. When the auxiliary filter is identified, the adaptive filter is updated using the auxiliary filter thus identified. When the update of the adaptive filter satisfies a predetermined end condition, the adaptive filter thus updated is superposed on the reproduction sound field characteristic. COPYRIGHT: (C)2009,JPO&INPIT
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