Patents by Inventor Han Kem

Han Kem 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: 5214650
    Abstract: A data adapter for simultaneously providing a low speed channel, a first high speed data channel, and a second high speed channel over a two wire connection; the two wire connection connects the data adapter to a telephone system. The data adapter includes a line transceiver connected to the two-wire connection, the line interface provides a full duplex transmission link with the telephone system over the two-wire connection. A telephone interface converts data between the first high speed channel and a telephone instrument. A rate adapter converts data between the second high speed channel and a data processing equipment. A protocol controller performs a packet protocol on the low speed channel, and routes the first high speed channel to the telephone interface and the second high speed channel to the rate adapter.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: May 25, 1993
    Assignee: AG Communication Systems Corporation
    Inventors: Robert E. Renner, Kuang-Cheng Hu, Han Kem, John S. Young
  • Patent number: 5058141
    Abstract: A single circuit for detecting a synchronization pattern in a serial data stream. Subsequent to detecting the synchronization pattern, the single circuit generates the control signals for converting the serial data to a parallel format and loading the parallel data into a first-in-first-out (FIFO) memory. The single circuit includes a controller arranged to receive the serial data stream. A counter is connected to the controller. When the counter is detecting the synchronization pattern and the synchronization pattern is being received, the counter is incremented. Absent the synchronization pattern being received, the counter is reset to a predetermined starting point. Subsequent to detecting the synchronization pattern, the counter generates a load signal. The single circuit further includes a pulse generator arranged to receive the load signal from the counter and generate a pulse of duration equal to a bit period of the serial data stream.
    Type: Grant
    Filed: March 1, 1990
    Date of Patent: October 15, 1991
    Assignee: AG Communication Systems Corporation
    Inventors: Han Kem, John S. Young
  • Patent number: 5023870
    Abstract: The circuit of the present invention provides a signal which allows data to be transferred between a first synchronous system to a second synchronous system. Where the first synchronous system is a Time-Division-Multiplexing (TDM) system and the second synchronous system is a Microprocessor system. The transfer is allowed at the end of the assigned time slot provided that the microprocessor is not accessing the data. If the microprocessor is accessing the data, then the transfer is delayed for three clock cycles of the TDM clock. After the delay, if the microprocessor is still accessing the data, the transfer is delayed again. The delaying continues until the microprocessor is no longer accessing the data, at which time the transfer is allowed.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: June 11, 1991
    Assignee: AG Communication Systems Corporation
    Inventor: Han Kem
  • Patent number: 4991170
    Abstract: An interface circuit which connects a Digital-Signal-Processor (DSP) to a serial controller. The interface circuit includes a bi-directional multiplexer which converts the separate address and data busses of the DSP to the multiplexed data and address bus of the serial controller. A timing generator is included for keeping track of the number of clock cycles in the present access. A decoder connected to the timing generator decodes the number of clock cycles and generates the appropriate control signals to both the serial controller and the DSP.
    Type: Grant
    Filed: July 17, 1989
    Date of Patent: February 5, 1991
    Assignee: AG Communication Systems Corporation
    Inventor: Han Kem