PURPOSE: To eliminate duplication of information and change over the output of a phase aligning/adding in a short time by converting the output of this circuit into equilibrium signal, and removing the same phase signal noise component on an equilibrium signal line using a noise signal removing circuit.
CONSTITUTION: A reception signal received by a vibrator 10 is amplified by an amplifier 14 with a certain amplification ratio and supplied to a phase aligning/adding circuit 33, and a delay time for receiving a signal at the specified focal point is given by a distributor 18 and a delay line 20. The output of this phase aligning/adding circuit 33a, 33b is supplied to an equilibrium converters 34a, 34b to be converted into equilibrium signal. These equilibrium signals are fed to a differential amplifier 38 one after another through switching circuits 36a, 36b changed over alternately, and the output of the equilibrium converter 34a is supplied when the switching circuit 36a is on while the output of the other 34b supplied when the switching circuit 36b is on. As noise signals included with ON/OFF operation of the switching circuit 36 are removed by the differential amplifier 38, a display 32 displays image with high resolution.
ONISHI TAKAYUKI
KIMIDA YUUJI
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