| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for determining a filter coefficient that determines a filter coefficient for performing filter processing with respect to an audio signal outputted from a speaker in order to reduce interference of a standing wave at a listening position.SOLUTION: A filter coefficient table section 63 determines filter coefficients of sub correction filters sections 61a to 61d on the basis of a frequency band generated by a dip on a front seat side or a rear seat side and a phase difference. On the basis of an amount of change in a signal level per phase difference on the front seat side and the rear seat side on the basis of the filter coefficients, a level determination section 62 finds a value of a phase difference with which either one of an amount of change of the front seat side and an amount of change of the rear seat side does not increase and decrease and the other increases considerably. Then, the filter coefficient table section 63 determines a filter coefficient of a main correction filter section on the basis of the found phase difference. |
