Patent ID: 6608903
Filing Date: 2003-08-19
Classification: H04R,H04S

Abstract:
A sound field reproducing method, comprising the steps of:dividing a space surrounding a sound source disposed in a sound field which is to be reproduced, into sound source element regions of an appropriate solid angle in which the sound source is centered; dividing a space surrounding a sound receiving point disposed in the sound field, into sound receiving element regions of an appropriate solid angle in which the sound receiving point is centered; calculating or measuring impulse responses, for each of combinations of the sound source element regions and the sound receiving element regions, wherein each of the impulse responses is calculated or measured in the sound field in which a sound radiated from the sound source is emitted from at least one of the sound source element regions, passes through the sound field, enters at least one of the sound receiving element regions, and reaches the sound receiving point; placing a plurality of microphones at positions which surround a real sound source in an arbitrary real space and at an appropriate distance in directions corresponding to the sound source element regions, respectively; placing a plurality of loudspeakers at positions which surround a real sound receiving point in an arbitrary real space and at an appropriate distance in directions corresponding to the sound receiving element regions, respectively; picking up a sound radiated from the real sound source, by the microphones to produce pickup signals; subjecting the pickup signals respectively to convolution operations with the impulse responses which are calculated or measured for the sound source element regions in directions corresponding respectively to the sound radiated from the real sound source; and reproducing respectively sound signals which are obtained by the convolution operations, from the loudspeakers which are placed correspondingly to the sound receiving element regions of corresponding directions, respectively.