Patent ID: 7658110

Claim:
An ultrasonic diagnostic system, comprising: electroacoustic conversion component in which a plurality of sub-arrays, each composed of a plurality of electroacoustic transducers, are arranged at least two-dimensionally; sub-beam formers that are provided on the sub-array basis, for subjecting signals output from the electroacoustic conversion component to delay addition; and a main beam former for subjecting signals output from the sub-beam formers to delay addition, wherein each sub-beam former, from each of received signals from the electroacoustic transducers in the sub-array, generates a non-inverted signal and an inverted signal having different polarities from each other, respectively, obtains a first signal by controlling amplitudes of the signals having a first polarity among the polarities, followed by adding, and obtains a second signal by controlling amplitudes of the signals having a second polarity among the polarities, followed by adding, delays only one of the first signal and the second signal according to a delay time corresponding to a quarter of one period of the received signal by a delay component composed of a capacitor memory provided inside, while the other one of the first signal and the second signal is not delayed, and adds the first signal and the second signal to which the delay time difference is imparted.