Ultrasonic diagnostic equipment

An ultrasonic diagnostic system is disclosed, which comprises an ultrasonic transducer array having plural transducer elements for transmitting an ultrasonic beam and generating echo signals from the echos reflected from an object, a circuit for exciting the transducer elements to generate the ultrasonic beam that propagates along a predetermined scanning line on the object, and a receiver circuit for time delaying and summing the echo signals to produce a summed output signal. In order to obtain velocity information from a moving object, the equipment further comprises a phase detecting circuit for selecting a Doppler shift signal from the summed output signal to produce a phase detected signal, a digital filter circuit for removing the phase detected signal component reflected from objects moving at lower speed than a predetermined speed from the Doppler shift signal, a circuit for envelope detecting the output signal from the digital filter circuit, a circuit for brightness modulating the amplitude of the output signal from the envelope detecting circuit, and a display unit for displaying the output signal from the brightness modulating circuit as a function of time in real time.