Patents by Inventor Toshikatsu Naitoh

Toshikatsu Naitoh 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).

  • Two-phase/four-phase modulated comb-shaped spread spectrum communication system
    Patent number: 6421367
    Abstract: When communications are performed between a transmitter 2 and a receiver 3 via a transmission path 4, the transmitter prepares a basic sequence consisting of two-phase or four-phase tips, and transmits an expanded transmission frame which is constructed by repeatedly arranging one or a plurality of the basic sequence so as to obtain a finite length periodic sequence with a comb-form spectrum and by adding the replica of one or a plurality of tips of a back portion and front portion of the finite length periodic sequence to the outside of the front portion and the outside of the back portion of the finite length periodic sequence; and the receiver demodulates the expanded transmission frame using a matched filter which is matched with the finite length periodic sequence which is the central part of the expanded transmission frame, that is not including the added tips. In other words, the present invention can simplify the construction of communication equipment by using two-phase signals or four-phase signals.
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: July 16, 2002
    Assignees: Toyo Communication Equipment Co., Ltd.
    Inventors: Noriyoshi Kuroyanagi, Naoki Suehiro, Toshikatsu Naitoh