Patent ID: 8116480

Claim:
A filter coefficient calculation device for calculating filter coefficients of a reproduction characteristic correction filter that corrects acoustic characteristics of a reproduction system configured to include an acoustic field, comprising: linear-phase impulse response calculating means for calculating impulse responses corresponding to a linear-phase filter having an inverse characteristic of a gain characteristic of the reproduction system; gain correction characteristic calculating means for calculating, as a gain correction characteristic, a frequency characteristic of continuous-time impulse responses that include a peak value, the continuous-time impulse responses being impulse responses, clipped from the impulse responses calculated by the linear-phase impulse response calculating means, whose number is identical to a preset number of filter taps; phase correction characteristic calculating means for calculating a phase correction characteristic by normalizing, from an inverse characteristic of a frequency characteristic of the reproduction system, a gain characteristic of the inverse characteristic; and filter coefficient calculating means for calculating, as filter coefficients of the reproduction characteristic correction filter, filter coefficients of a filter having a synthetic correction characteristic obtained by combining the gain correction characteristic with the phase correction characteristic.