| 摘要 |
PURPOSE:To attain an optimum tuning corresponding to a reception frequency by providing a tuning circuit between a cable and a receiving circuit in an ultrasonic diagnosing device wherein an ultrasonic probe is connected with the receiving circuit by the cable. CONSTITUTION:The tuning circuit 8a is provided between the receiving circuit 7 and ultrasonic probe 2 with which an ultrasonic wave transducer 1 is connected. The tuning circuit 8a consists of the series circuit of (n) coils 8a-8n and switching circuits 81a-81n, which are turned on and off with external control signals Ca-Cn. Consequently, the inductance of the tuning circuit 8a can be varied according to a received signal from the ultrasonic probe 1, so adequate tuning is performed. |
