Patents by Inventor Kiyoaki Kawai

Kiyoaki Kawai 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: 4744082
    Abstract: A multiplexing communication system for combining several asynchronous digital signals 151, 156 into a single high-speed line 141 comprising synchronizing circuits 101, 106 on each on n input data lines, service information insertion circuits 180 on each of the n synchronized lines, an nBmB coder 130 utilizing a pulse stuffing circuit 170 for increasing the n synchronized signals to m synchronized signals, and a multiplexer 140 for converting the m synchronized signals into a single high speed output 141.
    Type: Grant
    Filed: March 8, 1983
    Date of Patent: May 10, 1988
    Assignee: Nippon Electric Co., Ltd.
    Inventors: Hiroshi Fujimura, Kiyoaki Kawai
  • Patent number: 4520480
    Abstract: A digital transmission system employing nBmB codes in which provision is made for insertion of service and auxiliary data bits. The transmitter of the transmission system includes a series to parallel converter, register file, pulse insertion circuit, nBmB encoder and parallel to series converter. The bit rate of the parallel n bit code streams is converted to produce an additional time slot after each occurrence of a predetermined number of data bits. Service and auxiliary data bits are inserted in the additional time slots. The receiver portion of the transmission system includes a series to parallel converter, followed by an nBmB decoder, a pulse separator, a register file and a parallel to series converter. At the receiver, the mB code is converted back to an nB code from which the service and auxiliary data bits are extracted and subsequently removed.
    Type: Grant
    Filed: May 16, 1983
    Date of Patent: May 28, 1985
    Assignee: NEC Corporation
    Inventor: Kiyoaki Kawai