| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound field correction device that can correct the effect of a reflected sound in a sound field without causing degradation in sound quality with a configuration where no correction device is inserted between an acoustic signal source and a speaker by using a feedback type digital filter. SOLUTION: The sound field correction device is provided with a loudspeaker 1 placed in a reproduction sound field, a microphone 2 placed in the reproduction sound field, a 1st digital filter, a sbutractor that subtracts an output of the 1st digital filter from an output of the microphone 2, a 2nd digital filter receiving an output of the sbutractor and an adder 12 that sums an acoustic signal input and an output of the 2nd digital filter. Then an output of the adder 12 is given to the loudspeaker 1 and the 1st digital filter. Let an impulse response from the loudspeaker 1 to the microphone 2 in a time region of a direct sound be D, then a coefficient of the digital filter is selected to be D and the 2nd digital filter is controlled to decrease the output signal of the sbutractor.
|
