| 摘要 |
A signal of a whole audio frequency band is input to input lines CHL and CHR having band-split digital band pass filters BFL1 to BFLn and BFR1 to BFRn, attenuators ATL1 to ATLn and ATR1 to ATRn, delay elements ZL1 to ZLn and ZR1 to ZRn, and adders 21 to 24, thereby causing speakers 25 and 26 to generate sounds. The reproduced sounds are picked up by microphones 27 and 28 placed at listening positions. The obtained pick-up signals PR and PL are passed through band-split digital band pass filters BFL1' to BFLn' and BFR1' to BFRn' which are set to the same bands as those of the band-split digital band pass filters BFL1 to BFRn, to generate test data DL1(t) to DLn(t) and DR1(t) to DRn(t). On a basis of the test data, an interaural correlation coefficient rho RL is calculated. Attenuation factors of the attenuators, and delay times of the delay elements are adjusted so as to approximate the interaural correlation coefficient rho RL to a target interaural correlation coefficient rho RL' which is previously acquired on a basis of a transfer function of a target reproduced sound field. <IMAGE> |
