| 摘要 |
PURPOSE:To provide the beam former of an ulstrasonic diagnostic device which can obtain a satisfactory flow signal by an A/D converter of a low bit, and also, can execute dial beam forming. CONSTITUTION:A delaying circuit having a delay time of an integer multiple of an interval extending from a transmitting pulse to the next transmitting pulse is constituted by using an A/D converter 4a and a memory 6a, and a D/A converter 8a, and by adding a circuit for subtracting an output of the D/A converter 8a from an output of a sample holding circuit 3aa by an analog subtracter 10a, a dynamic range is enlarged, and by adding analog switches 14a, 15a thereto and extracting delay adding signals of two systems, this beam former is operated as a dual beam former, as well. |
