| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound field sound collection and reproduction technology capable of reproducing a sound field with higher accuracy compared with the conventional art.SOLUTION: A conversion filter part 3 generates a filter processed signal D∼(ω) by applying a filter F∼(ω) defined as the following formula to a spherical surface harmonic spectrum signal P∼(ω) generated on the basis of a signal collected by a microphone. A discrete spherical surface harmonic inverse transformation part 4 transforms the filter processed signal D∼(ω) into a frequency-domain signal, by discrete spherical surface harmonic inverse transformation. A frequency transformation part 5 transforms the frequency-domain signal into a time-domain signal by inverse Fourier transformation, and outputs the transformed time-domain signal to a loudspeaker. |
