| 摘要 |
PURPOSE:To improve the S/H of an image by decreasing an electromagnetic noise generated by the setting of delay time data in a delay circuit group by shielding it with a mother board. CONSTITUTION:Two delay circuit groups 6a, 6b which supply delay data to a reception echo signal are arranged separately on both planes of the mother board 10. An identification means 12 which recognizes planes on which the delay circuit groups 6a, 6b are loaded is provided. Selection means 11a, 11b which select the delay time data by changing the read or write address of memory in which the delay time data is stored supplied from the information of the identification means 12 to the delay circuit groups 6a, 6b are provided. The delay circuit group 6b or 6a on the other side focusing the echo signal from the electromagnetic noise by a digital signal operating when delay time is set in the delay circuit group 6a or 6b on one side is shielded by the mother board 10. |
