| 摘要 |
PURPOSE:To perform sound detection for in-phase beam signals, by generating (n) interpolated in-phase beams between adjacent basic in-phase beams. CONSTITUTION:A group of in-phase beam signals to be interpolated corresponding to (m) azimuths is selected 2 among basic in-phase beam signals B0-BM-1 from input terminals 10-1M-1, and a sound detection azimuth from an input terminal 3 is converted 4 to supply only segmentation information on the group of in-phase beam signals to be interpolated to a selector 2. Output signals corresponding to the (m) azimuths are stored in (m) storage devices 6 at the same time, and their outputs are inputted to interpolators 81-8n through (m) D/A converters 7, thereby outputting interpolated in-phase beam signals. Then, sound detection signals of the interpolated in-phase beam signals corresponding to (n+1) azimuths in total are inputted to an analog multiplexer 10 to select a desired sound detecion azimuth on the basis of control signal from a line 11, supplying it to a loudspeaker 12. |
