Patents by Inventor Jin-sub Choi

Jin-sub Choi 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).

  • Patent number: 5793320
    Abstract: A digital data level control circuit adopting a digital-to-analog conversion control mode is provided, in which a capacitor for removing popcorn (POP) noise is used towards an output end of a digital-to-analog converter portion and switching of a controller is controlled by a microcomputer to perform a desired level control, thereby effectively removing the POP noise. The digital data level control circuit includes a digital-to-analog converter portion for converting the digital data into analog data, a controller connected to an output end of the digital-to-analog converter portion, for controlling the level of the analog-converted data, and an out level control portion connected to one end of the controller, for smoothly controlling the level of the analog-converted output from the digital-to-analog converter portion.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: August 11, 1998
    Assignee: Samsung Electronics, Co, Ltd.
    Inventors: Dong-jun Keum, Jin-sub Choi, Duck-young Jung
  • Patent number: 5717763
    Abstract: A vocal mix circuit shifts the phase of a mixed audio signal using a phase shifter, and achieves a mixed signal emphasizing the voice components thereof, by subtracting a signal which is not shifted from the signal shifted by the phase shifter. Gain through the above steps is controlled by the gain controller. Then, operators process both the initial signals and the signal through the phase shifter and the gain controller. Accordingly, the vocal mix circuit enables a person to hear with high sensitivity, has a simple circuit, and reduces the number of external pins.
    Type: Grant
    Filed: July 10, 1996
    Date of Patent: February 10, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-Sub Choi, Dong-Jin Keum