Patents by Inventor Hyeon J. Choi

Hyeon J. 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).

  • Bidirectional communication system for CCTV
    Patent number: 5305100
    Abstract: A bidirectional communication system for a CCTV in a monitoring system having a plurality of monitoring cameras, comprising a plurality of rotators, each for rotating a corresponding one of the plurality of cameras in vertical and horizontal directions in response to upward, downward, left and right rotation control signals, a plurality of voice transmission and reception adapters, each mounted to a corresponding one of the plurality of cameras, for transmitting and receiving a voice signal, a plurality of remote controllers, each having a transmitter and a receiver for transmitting and receiving the voice signal remotely through a corresponding one of the plurality of voice transmission and reception adapters, a video selector for selecting a desired one of video signals from the plurality of cameras, a channel selector for selecting a desired channel for voice communication and camera rotation control, a voice processing circuit for performing transmission and reception of the voice signal through the plura
    Type: Grant
    Filed: December 28, 1992
    Date of Patent: April 19, 1994
    Assignee: Goldstar Co., Ltd.
    Inventor: Hyeon J. Choi