Patent ID: 7715568

Claim:
A binaural sound reproduction apparatus comprising: a correction filter to receive an input sound signal that is recorded using a binaural recording microphone and to filter the input sound signal to obtain a filtered signal and to supply the filtered signal to a headphone; an adaptive filter to receive the input sound signal; and difference detecting means for determining a difference between a sound signal that is obtained by collecting a sound reproduced by the headphone using a sound-collecting microphone that has a similar characteristic to that of the binaural recording microphone and a sound signal output from the adaptive filter and for feeding the difference to the adaptive filter, based on the input sound signal and the difference the adaptive filter is able to obtain a synthesis characteristic representative of (i) a characteristic of the headphone, (ii) a characteristic from the headphone to the sound-collecting microphone, and (iii) a characteristic of the sound-collecting microphone, to invert the synthesis characteristic so as to obtain an inverse synthesis characteristic, and to set a characteristic of the correction filter in accordance with the inverse synthesis characteristic, the set characteristic of the correction filter has a non-correction region and a correction region, in which the non-correction region includes a frequency region having an amplitude level or levels equal to or lower than a predetermined level and the correction region includes a frequency region having an amplitude level or levels higher than the predetermined level.