Patents by Inventor Shuichi Samejima

Shuichi Samejima 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).

  • Differential detection systems with non-redundant error correction
    Patent number: 4128828
    Abstract: The differential detection system comprises a demodulator for a modulated carrier transmission system for binary signals, in which a symbol detected from the phase difference between the received signal delayed by one signaling interval and the signal received in the present signaling interval is converted into data and a symbol detected from the phase difference between the received signal delayed by two signaling intervals and a signal received in the present signaling interval is converted into parity. The data and the parity are applied to a decoder for a rate 1/2 single error correcting self-orthogonal convolutional code effecting demodulation with non-redundant error correction. The correction system is also applicable to demodulate a carrier wave modulated by m (an integer) level digital data.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: December 5, 1978
    Assignee: Nippon Telegraph and Telephone Public Corp.
    Inventors: Shuichi Samejima, Kenkichi Hirade