Patents by Inventor Seong H. Chang

Seong H. Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bandwidth sampling technique for digital focusing in array imaging systems
    Patent number: 5581036
    Abstract: The present invention-relates to an ultrasonic array imaging system for focusing ultrasonic signals which are reflected from an object to be imaged and received by an array transducer. A digital focusing method and system in accordance with the present invention compensates for phase errors which are contained in digital data by using a quadrature sampling method in digital-processing and focusing of ultrasonic signals. Each of a plurality of delayed-time eliminators receive signals generated by quadrature sampling and removes delayed-time differences from signals. Each of phase compensators receives a digital signal in which a delayed-time difference is removed, and compensates the received digital signal for phase errors. An envelope detector is used to detect an envelope signal using the phase error compensated date.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: December 3, 1996
    Assignee: Medison Co., Ltd.
    Inventors: Seong H. Chang, Song B. Park