| 摘要 |
PURPOSE:To indicate turbulance with approximately same color at all times by providing a circuit for multiplying a turbulance component by a predetermined factor corresponding to switching of the characteristic of a MTI filter. CONSTITUTION:A signal subjected to D/A detection through a D/A detector 1 is filtered through a MTI filter 3, then a flow speed detecting circuit 4 detects flow speed based on the filtered signal and detects turbulance through a turbulance detecting circuit 5. A turbulance correcting circuit 6 comprises a multiplier 6-1 and a data selector 6-2 which selects any one of previously stored factors C0, C1, C2 based on a filter modification control signal for switching the characteristic of the MTI filter 3. The multiplier 6-1 multiplies the turbulance detected through the turbulance detecting circuit 5 by a factor C4 selected through the data selector 6-2 and provides an input to DSC7. Correction to an original value can be made corresponding to switching of the characteristic of the MTI filter 3 regardless of variation of the turbulance, and the turbulance can be indicated with approximately same color on a CRT8. |
