| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic field pickup reproduction technique whose precision is higher than the conventional techniques.SOLUTION: A frequency conversion unit 1 converts a signal picked up by a linearly arranged microphone array into a frequency region signal via Fourier transformation. A spatial frequency conversion unit 2 converts the frequency region signal into a spatiotemporal frequency region signal P-(ω) via spatial Fourier transformation. A conversion filter unit 3 generates a signal D-(ω) after filter processing by applying the filter F-(ω) defined by the following expression into the spatiotemporal frequency region signal P-(ω). A spatial frequency inverse conversion unit 4 converts the signal D-(ω) after filter processing to a frequency region signal via spatial inverse Fourier transformation. A frequency inverse conversion unit 5 converts the frequency region signal into a time domain signal via inverse Fourier transformation. |
